PANIC 2014 - Particles and Nuclei International Conference 2014

24 Aug 2014, 15:00 → 29 Aug 2014, 18:00 Europe/Berlin

Main Building (Hamburg University)

The 20^th International Conference on Particles and Nuclei (PANIC 14) will be held in Hamburg, Germany from 25th to 29th August 2014. This conference is the 20th in the series of triennial conferences which bring together the Particle and Nuclear Physics communities. PANIC 14 will consist of plenary talks and a number of parallel sessions.
The scientific programme will address a broad range of topics at the interface between particle, nuclear and astrophysics. Special emphasis will be devoted to recent discoveries and results. The conference is hosted by DESY, Deutsches Elektronen Synchrotron in Hamburg, Germany and the Institute for Experimental Physics at the University of Hamburg.

Abendvortrag Poster large 2014-09-PANIC-Abendvortrag_WEB.pdf

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PANIC17-Beijing-proposal PANIC2017-Beijing.pdf

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Sunday, 24 August

15:00 Registration

Monday, 25 August

08:00 Registration (until 17:00)

Plenary

Convener: Mr Peter Schleper (Hamburg University)

1 Conference welcome

Speakers: Mr Matthias Kasemann (DESY/CMS), Mr Peter Schleper (Hamburg University)

Slides Organisational.pdf

2 Higgs physics: experimental results

Speaker: David rousseau (LAL-Orsay)

Slides tr140825_davidRousseau_Higgs_PANIC2014-v4.pptx tr140825_davidRousseau_Higgs_PANIC2014-v4.pptx.pdf

3 Theory: Higgs and the Elektroweak interpretation

Speaker: Christophe grojean (CERN)

Slides Grojean_Panic_2014_08_25.pdf

4 conference photo

Photo-small BERG_PANIC_DESY_Vorab_11_07.jpeg

10:30 Coffee Break

Plenary

Convener: Prof. Wolfgang Kühn

5 Hard scattering in Heavy Ion collisions, jet quenching

Speaker: Dr Andrzej Olszewski (Institute of Nuclear Physics, Kraków)

Slides hard-scat-jets-panic2014-23082014.pdf

6 Hot dense matter at RHIC and LHC

Speaker: Prof. Eugenio Scapparone

Slides panic2014-Escapparone.pptx

7 Quark gluon plasma results

Speaker: Prof. Carsten Greiner

Slides greiner_panic.pdf greiner_panic.pptx

12:30 Lunch Break

Beyond Standard Model

Conveners: Dirk Zerwas (LAL Orsay), Johannes Haller (University Hamburg)

8 Searches for direct pair production of third generation squarks with the ATLAS detector

Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Top or bottom squarks with masses less than a few hundred GeV can also give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents recent ATLAS results from searches for direct stop and sbottom pair production.

Speaker: Mr Giulio Usai (Arlington UT)

Slides Panic2014_GiulioUsai.pdf

9 3rd generation SUSY searches at CMS

In this talk, the latest results from CMS on searches for stop and sbottom squarks are presented. Searches for direct squark production and indirect production through gluino cascades in a variety of decay channels are reviewed. The results are based on 20 fb-1 of data collected during the 8 TeV LHC run.

Speaker: Mr Florent Sylvain Lacroix (UC Riverside)

Slides 14_08_25_PANIC.pdf

10 Inclusive searches for squarks and gluinos with the ATLAS detector

Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks and gluinos, including third generation squarks produced in the decay of gluinos. The searches involved final states containing jets, missing transverse momentum with and without light leptons, taus or photons.

Speaker: Mr Bertrand Martin Dit Latour (Bergen)

Slides PANIC14_ATLAS_SquarkGluino_BertrandMartin.pdf

11 Inclusive SUSY searches at CMS

In this talk, the latest results from CMS on inclusive searches for squark and gluino production at the LHC are reviewed. A variety of complementary final state signatures and methods are presented using 20 fb-1 of data from the 8 TeV LHC run.

Speaker: Lukas Vanelderen (Universität Hamburg)

Slides inclusive_susy_cms_panic2014.pdf

12 Search for electroweak SUSY production at CMS

In this talk, the latest results from CMS on searches for supersymmetry produced through electroweak production channels are presented using 20 fb-1 of data from the 8 TeV LHC run. A variety of complementary final state signatures and methods are used, such as searches with Higgs, W, and Z bosons in the final state, to probe gaugino and slepton production.

Speaker: Mr Mario Masciovecchio

Slides ElectroweakSUSY_PANIC2014_MarioMasciovecchio_fV.pdf

Dark matter and cosmology

Convener: Mr Alan Robinson (University of Chicago)

13 The EDELWEISS-III Dark Matter Search: Status and Perspectives

EDELWEISS is a direct Dark Matter search program looking for WIMPs in the GeV-TeV mass range. For that purpose, an array of cryogenic Ge mono-crystals read out simultaneously by NTD thermal sensors and by surface electrodes is installed in the Modane underground laboratory. We present a summary of EDELWEISS-II results including limits on axion couplings. For EDELWEISS-III a major upgrade of the setup was undertaken, developing new FID800 Ge bolometers, a new DAQ system and improving the shielding to lower the background. We will present the status of the setup with up to 36 bolometers installed and the expected sensitivities for the upcoming long exposure WIMP search.

Speaker: Mr Lukas Hehn (KIT)

Slides PANIC2014_LukasHehn_EDELWEISS-III_final.pdf

14 Searching for Dark Matter with the LUX experiment

First postulated more than 80 years ago to address the 'missing mass' of the Milky Way galaxy Dark Matter remains as one of the best motivations for Physics Beyond the Standard Model. The Large Underground Xenon (LUX) experiment is a 350kg liquid xenon time projection chamber designed to directly detect galactic dark matter. Currently deployed 1 mile underground in the Sanford Underground Research Facility in Lead, South Dakota, LUX completed its first physics run in 2013 and produced a world-leading limit for spin-independent scattering of Weakly Interacting Massive Particles (WIMPs) using 95.3 live-days of WIMP-search data. After presenting these first results this talk will go on to discuss the calibration and detector development work following the first physics run as well as the current status of LUX and preparations for the upcoming 300-day run.

Speaker: Dr James Dobson (The University of Edinburgh)

Slides JDobson_LUX_PANIC2014_25thAug14.pdf

15 Searching a Dark Photon with HADES

The existence of a photon-like massive particle, the gamma' or dark photon, is postulated in several extensions of the Standard Model. Such a particle could indeed help to understand the puzzling behavior of the observed cosmic positron fraction as well as to solve the sofar unexplained deviation between the measured and calculated values of the muon g−2 anomaly. The dark photon, unlike its conventional counterpart, would have mass and would be detectable via its mixing with the latter. We present a search for the e+e− decay of such a hypothetical dark photon, also named U boson, in inclusive dielectron spectra measured with HADES in the p(3.5 GeV)+p, Nb reactions, as well as in the Ar(1.756 GeV/u) +KCl reaction. A new upper limit on the kinetic mixing parameter squared (epsilon^2) at 90% CL has been obtained in the mass range M(U) = 0.02 – 0.55 GeV and is compared here with the present world data set. For masses 0.03 – 0.1 GeV, the limit has been lowered with respect to previous results, allowing to exclude a large part of the parameter space favored by the muon g−2 anomaly. From our data also an improved upper limit of 2.3 × 10^-6 (90% CL) could be set on the branching ratio of the helicity-suppressed direct decay of the eta meson, i.e. eta -> e+e−.

Speaker: Dr Romain Holzmann (GSI Helmholtzzentrum fuer Schwerionenforschung)

Slides RHolzmann_PANIC2014.pdf

16 DArKSIDE-50: results from first argon run

DarkSide-50 (DS-50) at Gran Sasso underground laboratory, Italy, is a direct dark matter search experiment based on a TPC with liquid argon from underground sources. The DS-50 TPC, with 50 kg of active argon and a projected fiducial mass of >33 kg, is installed inside an active neutron veto based on a boron-loaded organic scintillator. The neutron veto is built inside a water cherenkov muon veto. DS-50 has been taking data since Nov 2013, collecting more than 2e7 events with atmospheric argon. This data represents an exposure to the largest background, beta decays of Ar-39, comparable to the full three-year run planned for DS-50 with underground argon. When analyzed with a threshold that would give a sensitivity in the full run of about 1e-45 cm^2 at a WIMP mass of 100 GeV/c^2, there is no Ar-39 background observed. The detector design and performance will be presented as well as results from the atmospheric argon run still in progress. Plans for the underground argon run and for a ton-scale detector within the same neutron veto vessel will be presented.

Speaker: Mr Davide D'Angelo (Univ. degli Studi di Milano e INFN)

Slides PANIC2014_DS50_ddangelo.pdf

Hadrons in medium - hyperons and mesons in nuclear matter

Convener: Dr Janus Weil (FIAS)

17 Strangeness in the Universe? Advances and perspectives in the low-energy kaon-nucleon/nuclei interaction studies at the DAFNE collider

The low-energy QCD in the strangeness sector is still lacking fundamental experimental results in order to achieve a breakthrough in its understanding. Among these experimental results, the low-energy kaon-nucleon/nuclei interaction studies are playing a key-role. Combining the excellent quality kaon beam delivered by the DAFNE collider with new experimental techniques, as fast and very precise X ray detectors, like the Silicon Drift Detectors, and with the almost full acceptance charged and neutral particles KLOE detector, we have performed unprecedented measurements in the low-energy strangeness sector in the framework of SIDDHARTA and AMADEUS Collaborations. The kaonic atoms, as kaonic hydrogen and kaonic deuterium, provide the isospin dependent kaon-nucleon scattering lengths from the measurement of X rays emitted in the de-excitation process to the fundamental 1s level of the initially excited formed atom. The most precise kaonic hydrogen measurement was performed by the SIDDHARTA collaboration, which realized, as well, the first exploratory measurement for kaonic deuterium ever. Additional important measurements of more complex systems, as kaonic helium 3 and kaonic helium 4, were as well done (the kaonic helium 3 was measured for the first time as well). Presently, a major upgrade of the setup, SIDDHARTA-2 is ready to perform in the near future a precise measurement of kaonic deuterium and other exotic atoms. The kaon–nuclei interactions are being measured by the AMADEUS collaboration for kaon momenta smaller than 100 MeV/c by using the KLOE detector implemented in the central region with a dedicated setup. Preliminary results for the interaction of negatively charged kaons with various type of nuclei will be shown, including an analyses of the still “mysterious” Lambda(1405). Future plans will be discussed. DAFNE, with SIDDHARTA, SIDDHARTA-2 and AMADEUS, represents an opportunity which is unique in the world to, finally, unlock the secrets of the QCD in the strangeness sector, with important consequences going from particle and nuclear physics to astrophysics.

Speaker: catalina Circeanu (LNF-INFN)

Slides catalina-PANIC2014-hamburg.pdf catalina-PANIC2014-hamburg.ppt

18 Hyperon-nucleon interaction in chiral effective field theory

Recently, a hyperon-nucleon (YN) interaction has been derived up to next-to-leading order in chiral effective field theory by the Jülich-Bonn-Munich group. At that order there are contributions from one- and two-pseudoscalar-meson exchange diagrams and from four-baryon contact terms without and with two derivatives. SU(3) flavor symmetry is imposed for constructing the YN interaction in order to reduce the number of free parameters. In the actual calculation the SU(3) symmetry is broken, however, by the mass differences between the Goldstone bosons (pion, eta, K-meson) and between the baryons. For these masses the known physical values are used. An excellent description of available Lambda-N and Sigma-N scattering data has been achieved at next-to-leading order. Corresponding results will be reported. The in-medium properties of this YN interaction have been investigated. Specifically, binding energies of the Lambda and Sigma hyperons in nuclear matter have been calculated, based on conventional first-order Brueckner calculation, and will be presented and discussed.

Speaker: J. Haidenbauer (Forschungszentrum Jülich)

Slides jhpanic14.pdf

19 Measuring the potential of antihyperons in nuclei with antiproton beams at PANDA

PANDA is a key experiment of the FAIR facility in Darmstadt. It will study fundamental questions of hadron physics and QCD by exploring interactions between an antiproton beam and a fixed proton or nuclear target. Because of the relative large production cross section of hyperon-antihyperon pairs in antiproton-nucleus collisions, PANDA will be an ideal instrument to study hyperons and antihyperons in a nuclear medium. The interaction between a baryon and an anti-baryon may shed light on the short-range structure of the residual baryon-baryon force. However, because of the deep imaginary potential the behavior of anti-hyperons in nuclei is terra incognita. The exclusive production of hyperon-antihyperon pairs (as well as meson-antimeson pairs) close to their respective production threshold represents the only realistic opportunity to study quantitatively antihyperons in nuclei. In the case of (Lambda + Lambda_bar) and (Sigma minus + Lambda_bar) production in antiproton-neon collisions around 1 GeV incident energy, calculations using the GießenBUU transport model indicatea strong sensitivity of transverse momentum correlations on the depth of the Lambda_bar potential well in nuclei. Because of the relative large production cross section of (Lambda + Lambda_bar) pairs in antiproton-nucleus collisions the luminosity required at PANDA experiment at FAIR will be rather moderate. Therefore, this experiment is ideally suited for the start-up phase of PANDA@FAIR. In this talk we present the predictions of the transport model calculations for different beam energies and different neon isotopes. The expected sensitivity of the PANDA setup obtained by a realistic Monte Carlo inserted in the experiment full simulation framework will be discussed.

Speaker: Dr Alicia Sanchez-Lorente (HIM)

Slides ASanchezLorentePANIC2014.pdf

20 Search for the K ̄pp bound state via the inflight-kaon reaction on helium-3

The investigation of antikaon(Kbar) nuclear bound states is one of the hottest topics in strangeness nuclear physics since observations of such states give quite unique information on the sub-threshold KbarN interaction[1]. However, the existence of Kbar nuclear-states has not been established so far, even for the simplest system, K ̄pp[2]. Our approach is to search for the K ̄pp bound state via the 3He(K ̄,n) reaction at a kaon momentum of 1 GeV/c(J-PARC E15[3]). In this reaction, most of background processes such as multi-nucleon processes and hyperon decays are separable thanks to the inflight kinematics. A helium-3 target enlarges the chance to reconstruct full kinematics of the reaction by detecting the expected decay, “K ̄pp” → Λp → π ̄pp. To realize such a measurement, we constructed a spectrometer system composed of a beam spectrometer, a large acceptance cylindrical detector system (CDS) surrounding a liquid helium-3 target, and a forward neutron detection system at the K1.8BR experimental area in the J-PARC hadron experimental facility[4]. The first physics data were taken in May, 2013, with ∼5 × 10^9 kaons on the helium-3 target. The main goal of the data-taking was to search for a signal of the K ̄pp bound state in the (semi-)inclusive neutron analysis, which requires much less kaon irradiation than the exclusive Λpn measurement. The new spectrometer system worked well as expected, and we successfully obtained the 3He(K ̄,n)X missing-mass spectrum at forward angle with a resolution of ∼10 MeV/c^2 at around the K ̄ + p + p mass threshold. The spectrum was obtained by requiring at least one charged track in the CDS to reconstruct the vertex position, and has a good signal-to-noise ratio of ∼100 : 1 at the quasi-free K ̄“N”→KbarN reaction peak. The analysis will soon be finalized. In this contribution, the latest results of the first physics data in J-PARC E15 will be discussed, focusing on the K ̄pp bound region in the semi-inclusive 3He(K ̄,n) spectrum. [1] Y. Akaishi and T. Yamazaki. Phys. Rev. C 65 044005 (2002). [2] M. Agnello, et al., Phys. Rev. Lett 94, 212303 (2005); T. Yamazaki, et al., Phys. Rev. Lett 104, 132502 (2010); L. Fabbietti, et al., Nucl. Phys. A 914, 60 (2013); A. O. Tokiyasu et al. Phys. Lett. B 728, 616 (2014). [3] M. Iwasaki and T. Nagae (E15 collaboration), J-PARC E15 proposal, (http://j-parc.jp/NuclPart/pac 0606/pdf/p15-Iwasaki.pdf). [4] K. Agari, et al., Prog. Theor. Exp. Phys. 02B011 (2012).

Speaker: Dr Tadashi Hashimoto (RIKEN)

Slides panic2014.pdf

Neutrinos and related astrophysical implications

Convener: Dr Robert Lahmann (ECAP/University of Erlangen)

21 Neutrinoless double beta decay with EXO-200

EXO-200 is one of the most sensitive searches for neutrinoless double beta decay in the world. The experiment uses 175 kg of enriched liquid xenon in an ultralow background time projection chamber installed at the Waste Isolation Pilot Plant, a salt mine with a 1600 m water equivalent overburden. This detector has demonstrated excellent energy resolution and background rejection capabilities. Using the first two years of data, EXO-200 has set a limit of 1.1x10^25 yr at 90% C.L. on the neutrinoless double beta decay half-life of Xe-136.

Speaker: Dr Dave Moore (Stanford)

Slides Moore_EXO_200_PANIC.pdf

22 The nEXO experiment

The nEXO Collaboration is designing a very large detector for neutrino-less double beta decay of Xe-136. The nEXO detector is rooted in the the currently-running EXO-200 program, which has reached a sensitivity for the half life of the decay of 1.9 x 10^25 years with and exposure of 99.8 kg-yr. The baseline nEXO design uses 5 tonnes of liquid xenon, enriched in the mass 136 isotope, in a time projection chamber with scintillation readout. The detector is designed to reach a half-life sensitivity of >5 x 10^27 years and cover the inverted neutrino mass hierarchy with 5 years of data. We present the nEXO detector design, the current R&D, and the physics case for the experiment.

Speaker: Dr Dave Moore (Standford)

Slides Moore_nEXO_PANIC.pdf

23 CANDLES -- Search for Neutrino-less Double Beta Decay of $^{48}$Ca --

CANDLES is the project to search for neutrino-less double beta decay (0$\nu\beta\beta$) of $^{48}$Ca. 0$\nu\beta\beta$ is acquiring great interest after the confirmation of neutrino oscillation which demonstrated nonzero neutrino mass. Measurement of 0$\nu\beta\beta$ provides a test for the Majorana nature of neutrinos and gives an absolute scale of the effective neutrino mass. In order to search for 0$\nu\beta\beta$ of $^{48}$Ca, we proposed CANDLES system by using CaF$_{2}$ scintillators. The CANDLES system aims at a high sensitive measurement by a characteristic detector system and $^{48}$Ca enrichment. The system realizes a complete 4$\pi$ active shield by immersion of the CaF$_{2}$ scintillators in liquid scintillator. The active shield leads to a low background condition for the measurement. On the other band, $^{48}$Ca enrichment is also effective for the high sensitive measurement, because natural abundance of $^{48}$Ca is very low (0.19\%). We have studied $^{48}$Ca enrichment and succeeded in obtaining enriched $^{48}$Ca although it is a small amount. Now we have developed the CANDLES III system, which contained 350 g of $^{48}$Ca without enrichment, at the Kamioka underground laboratory. Two improvements, a light-concentration system and a new DAQ system, were installed for the CANDLES III system. The light-concentration system improved a energy resolution by increasing a PMT photo-coverage by 80\%. The new DAQ system, which is a dead time less system, improved a rejection efficiency for a characteristic background origin. Now we checked detector performance with the light-concentration system and the new DAQ system. Here we will report the detector performance for background rejection, and the expected sensitivity with the light-concentration system and the new DAQ system.

Speaker: Dr Saori UMEHARA (Osaka University)

Slides 2014.08.25_PANIC_UMEHARA.pdf

24 Results of CUORE-0 and Prospects of the CUORE Experiment

CUORE-0 is a cryogenic detector that uses an array of tellurium dioxide bolometers to search for neutrinoless double-beta decay of 130Te. CUORE-0 is located at the Laboratori Nazionali del Gran Sasso in Italy and has been taking data since March 2013. I will present the analysis of data collected since March 2013. Based on the measurements in the region of interest, the CUORE-0 half-life sensitivity is expected to surpass the observed lower bound of Cuoricino, a predecessor experiment, with one year of live time. I will also discuss the prospects of CUORE, which has a 130Te mass 19 times greater than that of CUORE-0. CUORE recently completed detector construction and is scheduled to begin data-taking in 2015. I will discuss the physics potential of CUORE-0 and CUORE, including their sensitivity to two-neutrino double-beta decay and dark matter.

Speaker: Dr Kyungeun E. Lim (Yale University)

Slides lim-panic-q0-cuore-indico.pdf

25 The {\sc Majorana Demonstrator} search for neutrinoless double-beta decay

An observation of neutrinoless double-beta decay ($0\nu\beta\beta$) identifies the neutrino as a Majorana particle and constrains the absolute mass scale of neutrinos. The {\sc Majorana} collaboration is constructing an array of high purity germanium detectors that are isotopically enriched in $^{76}$Ge that will serve as both a source and detector of $0\nu\beta\beta$. In the presence of backgrounds, the half-life sensitivity is inversely proportional to the square root of the background rate and energy resolution. Hence this search benefits from the intrinsic radio-purity of the germanium detectors as well as their high energy resolution. Also, the experiment operates within a compact shield constructed from lead and high purity copper that increase in purity toward its center. Pulse shape discrimination capabilities of the p-type point contact detectors can further filter out background events. The {\sc Majorana Demonstrator} plans to achieve backgrounds at the level of 3 counts per tonne -- year in the region of interest to demonstrate the feasibility of a tonne-scale Ge experiment. Cryostat modules containing strings of Ge detectors are currently being assembled and commissioned at the Sanford Underground Laboratory in Lead, SD. Here we give an overview of the project and present the current status.

Speaker: Mr Christopher O'Shaughnessy (University of North Carolina at Chapel Hill)

Slides MajoranaDemonstrator_PANIC14.pdf

26 The Hunt for neutrinoless double beta decay with the NEXT experiment.

NEXT (an acronym for Neutrinoless Experiment with a Xenon TPC) will search for the neutrinoless double beta decay of 136Xe using a radiopure high-pressure xenon gas TPC filled with 100 kg of Xe enriched in its 136Xe isotope. A measurement of this hypothetical process would provide direct information on neutrino masses at the same time that would lead to a better understanding of many aspects of the current Standard Model of Particle Physics, and the structure of the Universe. The NEXT-100 detector, thanks to its excellent energy resolution, together with powerful background rejection based on track reconstruction, will be one of the leading experiment in the field, exploring the region of neutrino masses down to 100 meV. In this talk, we will describe the physics case of the NEXT experiment together with the latest results obtained with NEXT-DEMO, a scaled-down prototype of the final detector which has been built to demonstrate the feasibility of the technology. In its final configuration, NEXT-DEMO includes an energy plane made of PMTs and a tracking plane made of SiPMs. X-ray energy depositions, produced by the de-excitation of xenon atoms after their interaction with gamma rays coming from different sources, have been used to characterize the detector response and the spatial calibration needed for close-to-optimal energy resolution. In addition, these data have been used to measure different detection properties of high-pressure xenon, such as electron drift velocity or longitudinal diffusion.

Speaker: Mr David Lorca Galindo (IFIC-CSIC)

Slides PANIC2014_Lorca.pdf

Nuclear and particle astrophysics

Convener: Dr Paolo Finelli (University of Bologna)

27 Equation of state for supernova and neutron stars in a relativistic mean field model with density dependent couplings

The equation of state (EoS) of hot and dense matter plays a fundamental role in the understanding of core-collapse supernova. A phase transition from hadronic to exotic phases might occur in the early post-bounce phase of a core collapse supernova. We generate a full tabular equation of state of dense matter with $\Lambda$ hyperons. The $\beta$-equilibrated EoS involving hyperon-hyperon interaction results in a $2.1 M_{\odot}$ neutron star, that is compatible with the latest observations. We adopt a density-dependent relativistic mean field model(DD2) for a broad range of density ($\sim 10^4-10^{15}$ g/cm$^3$), temperature($T=0.01\quad \mathrm{to}\quad 10^{2.4}$ MeV ) and charge-to-baryon number ratio ($Y_p= 0 \quad \mathrm{to} \quad0.65$ ). The DD model is exploited to describe uniform and non-uniform matter in a consistent manner. Further, light and heavy nuclei along with interacting nucleons are treated in the nuclear statistical equilibrium (NSE) model of Hempel and Schaffner-Bielich (HS) which includes excluded volume effects and DD relativistic interactions. We investigate the role of strange hyperons in the dynamical collapse of a non-rotating massive star to a black hole using 1D General relativistic simulation $GR1D$. We follow the dynamical formation and collapse of a protoneutron star (PNS) from the gravitational collapse of a massive progenitor of Wooseley, adopting our DD2 hyperonic EoS. We also study the neutrino signals that may be used as a probe to core collapse supernova. We compare our results with those of Shen EoS.

Speaker: Dr sarmistha banik (BITS Pilani, Hyderabad)

Slides banik.pdf

28 Recent results from the Telescope Array Experiment

The Telescope Array Experiment (TA) is the northern hemisphere's largest detector of ultra-high-energy cosmic rays (UHECRs). Built to measure the UHECR chemical composition, arrival-direction anisotropy, and energy spectrum for E > 1 EeV, TA's instrumentation includes both an array of scintillator-based particle counters and three fluorescence detector stations overlooking the ground array. This talk highlights recent composition, spectrum, and anisotropy measurements based on UHECR data collected since TA operations began in 2007, including preliminary results for E > 10 PeV from the newly commissioned TA Low-energy Extension (TALE). The expected impact of planned expansions to the experiment will also be described.

Speaker: Dr Thomas Stroman (University of Utah)

Slides Recent_Results_from_the_Telescope_Array_Experiment.pptx Recent_Results_from_the_Telescope_Array_Experiment_-_splitslides.pdf

29 LHCf : Very forward measurement at LHC p-p and p-Pb

The LHCf experiment is one of the forward experiments at the LHC. The purpose is to provide critical calibration data for hadronic interaction model which are used for MC simulations of air shower generated by very high energy cosmic-rays. The LHCf has two independent detectors which are installed at +/-140m from a LHC interaction point, IP1. The detectors are sampling and imaging calorimeters and the rapidity coverage is > 8.4. The LHCf had operations at 0.9 and 7 TeV p-p collisions in 2010 and at p-Pb collisions in 2013. Recently we are publishing the result of forward neutron spectra at 7TeV p-p collisions and the result of forward neutral pion spectra at 5 TeV p-Pb collisions. The nuclear modification factor of the forward neutral pions at p-Pb is considerably small and about 0.1. The results are compered with predictions of hadronic interaction models.

Speaker: Dr Hiroaki MENJO (STE laboratory, Nagoya University, Japan)

Slides PANIC2014_Menjo_20140825.pdf

30 The Kinematic Lightweight Energy Meter (KLEM) method for the NUCLEON space experiment

The NUCLEON apparatus is a low orbit space ray detector positioned on the Resurs-P satellite. The main detector for measuring space ray energy is the kinematic lightweight energy meter (KLEM). The KLEM method is a development of the kinematic calorimeter method proposed by Castagnoli in 1953. The main principle of a basic kinematic calorimeter is to measure primary particle’s energy by measuring spatial distribution of secondary particles produced by first hadron interaction in the target. The difference of the KLEM from such calorimeter consists in presence of the gamma converter. Its task is to convert gammas, produced in neutral pions’ decays, into electron-positron pairs. This increases number of registered secondary fragments and accuracy of the method. Application of the KLEM method has allowed to design the detector that is lighter than a traditional ionisation calorimeter, to create the apparatus with greater effective surface and geometrical factor. The KLEM of the NUCLEON space experiment consists of the carbon target of one nuclear length thickness and six planes of silicon strip detectors with tungsten converters 0.5 radiation lengths each. Size of sensitive region is 50x50 cm^2, geometrical factor of the KLEM and the trigger system is 0.2 m^2*sr. To distinguish elements of space rays, a charge measurement system is included into the NUCLEON apparatus. It consists of four planes of silicon pad detectors, which are positioned in front of the target. The test sessions on the SPS CERN beam have shown that the energy measurement accuracy is 80%, and the charge measurement system can distinguish nuclei with Z from 1 to 30. The NUCLEON experiment’s KLEM calorimeter is able to increase accuracy of spectra of space ray elements with energies from 100 GeV to 10 TeV.

Speaker: Mr Igor Kovalev (SINP MSU)

Slides PANIC_presentation.pptx

Quarks and gluons in hadrons, the hadron spectrum

Convener: Dr Michel Guidal (Institut de Physique Nucleaire, Orsay)

31 Transverse Spin Physics at PHENIX

In the past decade, the data from transverse spin p+p from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory and polarized DIS experiments have enabled enormous progress in our understanding of the transverse spin dynamics in the proton. PHENIX Collaboration has carried out a very active program of transverse spin measurements, including transverse spin asymmetries (TSSAs) in the production of light/heavy quark, of leading neutrons at forward rapidity, and of di-hadron/jet spin correlations in a wide kinematic range. All of these are crucial toward solving the transverse spin puzzle by disentangling the Sivers, the Collins and other spin effects. In the next two years we plan to collect new data on transversely polarized p+p and p+A with high luminosities. In this talk, I will summarize the recent results from the PHENIX experiment, and discuss the near-term prospects of new physics measurements enabled by the newly installed silicon vertex tracker (FVTX) and the MPC-EX detectors currently under construction.

Speaker: Dr Ming Liu (Los Alamos National Lab)

Slides PHENIX-Transverse-Spin-PANIC2014-Liu-final.pdf

32 Constraining Transversity and Nucleon Transverse-polarization Structure Through Polarized Proton Collisions at STAR

A complete picture of collinear nucleon spin structure, at leading twist, requires knowledge of three types of parton distribution functions (PDFs): the unpolarized PDFs; the helicity PDFs; and the transversity PDF, the net transverse polarization of quarks within a transversely polarized nucleon. Of the three, transversity is the most difficult to probe due to its chiral-odd nature. Current knowledge of nucleon transverse-polarization structure comes from measurements of transverse single-spin asymmetries (SSAs) from semi-inclusive deep inelastic scattering (SIDIS). These SIDIS measurements, combined with those of electron-positron collisions, have allowed the first extraction of transversity. The kinematic reach of these measurements leaves poor constraints at higher values of Bjorken-x. One avenue to enrich understanding over a different kinematic range is jet and di-hadron production from polarized-proton collisions. The STAR detector at RHIC has seen non-zero SSAs due to the effects of transversity coupled to the Collins and interference fragmentation functions (IFFs) for the first time in p↑ + p → jet + π^± + X and p↑ + p → π⁺π⁻ + X, respectively, at |η| < 1 from 2.2 pb^-1 at √s = 200 GeV, collected in 2006. In 2011 and 2012, STAR integrated 25 pb^-1 and 20 pb^-1 of transversely polarized proton data at √s = 500 GeV and √s = 200 GeV, respectively. Higher precision measurements of Collins and IFF asymmetries at 200 GeV should allow for more precise constraints of transversity across the kinematic range of p+p collisions. Extending these measurements for the first time to 500 GeV allows one to examine the effects of transverse-polarization structure for a different mix of partonic subprocesses than those found at 200 GeV, for instance, with more favorable sensitivity to linearly polarized gluons. The comparison of all asymmetry moments at 200 GeV and 500 GeV may also yield insight into longstanding theoretical questions concerning evolution, universality, and factorization breaking in non-collinear formulations of pQCD. Results from the 2011 jet analysis at √s = 500 GeV will be presented, including the first-ever measurements offering constraints on models involving gluon linear polarization. The progress of the 2011 IFF analysis at √s = 500 GeV and the 2012 jet and IFF analyses at √s = 200 GeV will also be presented.

Speaker: Dr James Drachenberg (Valparaiso University)

Slides Drachenberg_PANIC14.v2.2.pdf

33 Transverse single-spin asymmetries in $W^{\pm}$ and $Z^{0}$ boson production in p+p collisions at $\sqrt{s}=500$ GeV at RHIC

The Sivers function $f^{\perp}_{1T}$ describes the correlation of parton transverse momentum with the transverse spin of the nucleon. There is evidence of a quark Sivers effect in semi-inclusive DIS (SIDIS) measurements. In SIDIS, the quark Sivers function is associated with a final state effect from the gluon exchange between the struck quark and the target nucleon remnants. On the other hand, for the virtual photon production in the Drell-Yan process, the Sivers asymmetry appears as an initial state interaction effect. As a consequence, the quark Sivers functions are of opposite sign in SIDIS and in Drell-Yan and this non-universality is a fundamental prediction from the gauge invariance of QCD. The experimental test of this sign change is one of the open questions in hadronic physics, and can provide a direct verification of TMD factorization. While luminosities required for a precise measurement of asymmetries in Drell-Yan production are challenging, $W^{\pm}/Z^{0}$ production is equally sensitive to the predicted sign change and can be well measured at the STAR experiment. The results can also provide essential input to study the evolution effects of the Sivers function, because of the high $Q^{2}$ in $W^{\pm}/Z^{0}$-production. The $W$ boson kinematics are fully reconstructed from the decay lepton and the recoil, by employing a MC-based correction, thus avoiding the dilution that an asymmetry reconstructed from the decay lepton only would suffer. We will present the preliminary results for the measurement of the transverse single spin asymmetry, $A_{N}$, of the $W^{\pm}/Z^{0}$ bosons from the STAR experiment at RHIC using transversely polarized proton-proton collisions at $\sqrt{s}=500$ GeV. RHIC is capable of delivering up to $\sim 1~\text{fb}^{-1}$ at $\sqrt{s} = 500$ GeV during the upcoming 2016 p+p run. This will allow STAR to simultaneously test the Sivers' sign change, investigate the sea-quark Sivers' function and pin down TMD evolution through measurements of Drell-Yan, $W^{{\pm}}/Z^{0}$ and $\gamma$ production in p+p collisions.

Speaker: Dr Salvatore Fazio (Brookhaven National Laboratory)

Slides Fazio_PANIC2014_STAR_W_v3.pdf Fazio_PANIC2014_STAR_W_v3.pptx

34 Polarised Drell-Yan measurement in the COMPASS experiment at CERN

The COMPASS experiment at CERN has been contributing to the description of the nucleon spin structure, namely the transverse momentum dependent parton distribution functions (TMDs), through the Semi-Inclusive Deep Inelastic Scattering (SIDIS) using a muon beam impinging on polarised targets. These TMD functions are also accessible via the transversely polarised Drell-Yan (DY) process, which will be studied in the next COMPASS data taking, starting this fall. This process, in which the proton valence region will be explored, will be studied in collisions of a 190 GeV/c negative pion beam with a transversely polarised ammonia target. The QCD prediction that Sivers and Boer-Mulders TMDs change sign when accessed through SIDIS or via DY will be checked by the new COMPASS measurement. Considering one year of data taking, the Sivers azimuthal asymmetry statistical error is expected to be less than 2%. In addition to the polarised target, other nuclear targets will give the possibility to study unpolarised DY subjects. The experimental setup will be presented, and predictions and expectations will be discussed.

Speaker: Mrs Márcia Quaresma (LIP - Lisbon)

Slides presentation_panic2014_marcia.pdf

35 COMPASS polarized target for pion-induced Drell-Yan experiment

The Drell-Yan (DY) process is considered to be a powerful tool to study hadron structure. A new generation of polarized DY measurements using unpolarized pion beam and polarized target is under the preparation at COMPASS experiment at CERN. One of the key experimental tasks here is the modification of the unique COMPASS low temperature polarized target for Drell-Yan experiment which is the prerequisite to cope with high heat input from the pion beam. This includes the preparation of the new target holder, high frequency polarizing cavity and nuclear magnetic resonance (NMR) system for measuring of target polarization in Drell-Yan studies. At COMPASS the unpolarized pion beam with momentum of 190GeV/c and intensity up to 10|8 pions/s will interact with transversely polarized proton target producing muon pair via Drell-Yan process. The solid NH3 is polarized by dynamic nuclear polarization (DNP) method. Maximum polarization reached during data taking is expected to be up to 90 %. Two target cells with gap of 20 cm, each 55 cm long and 4 cm in diameter give target cell volume about 690 cm3. The microwave cavity has one central microwave stopper. Non-interacting beam and other particles produced inside the target will be stopped in the hadron absorber after the polarized target. This absorber will worsen somewhat the vertex resolution in comparison with present COMPASS system. Among the first distributions to be studied at COMPASS DY experiments are Sivers, Boer-Mulders and pretzelosity TMDs as well as transversely polarized quark distributions. These measurements will make it possible to test a most important prediction of QCD. The Drell-Yan data taking is expected to start in 2014 - 2015 for period of approximately 180 days. Current status of the polarized target, the required modifications and future plans will be presented.

Speaker: Mr Jan Matousek (Charles University in Prague)

Slides Matousek_PANIC_2014.pdf

36 The E-906/SeaQuest Experiment

The E-906/SeaQuest experiment at Fermilab continues a series of Drell-Yan measurements to explore the antiquark structure of the nucleon and nuclei. To extend existing measurements to larger values of Bjorken-x, a 120 GeV proton beam extracted from Fermilab’s main injector is used, resulting in a factor of 50 more luminosity than previous experiments and enabling access to values of x up to 0.9. An overview will be presented of the key physics goals of the E-906/SeaQuest collaboration. These include investigation of the dramatic dbar/ubar flavor asymmetry in the nucleon sea and its behavior at high x; study of the EMC effect in Drell-Yan scattering and the unexpected absence of any antiquark excess in existing data; and measurements of the angular dependence of the Drell-Yan process, sensitive to spin-orbit correlations within the nucleon. Updates to the SeaQuest experiment with polarized beam (E-1027) and target (E-1039) will allow to study the spin-orbit correlations in the analysis of single-spin asymmetries providing complimentary information to the existing SIDIS data. The talk will conclude with a status report on the ongoing data taking and data analysis of this new experiment.

Speaker: Dr Markus Diefenthaler (University of Illinois at Urbana-Champaign)

Slides PANIC2014-Diefenthaler.pdf

Quarks and gluons in hot and dense matter

Convener: Dr Stephane Munier (CPHT, Ecole polytechnique, CNRS)

37 Strangeness and charm content of strongly interacting matter

Fluctuations of conserved charges, i.e. baryon number, strangeness and electric charge, are sensitive probes for the transition from the confined hadronic to the deconfined partonic phase of strong interaction matter. Rapid changes of, e.g. quadratic fluctuations of net baryon number, net strangeness as well as correlations between these conserved charges, signal the change of degrees of freedom that carry the corresponding quantum numbers. The magnitude of these charge correlations and fluctuations provides information not only on the mass of the carriers of these quantum numbers (hadrons or quarks), they also are sensitive to the overall number of these degrees of freedom. We show that the analysis of correlations between net baryon number and net strangeness or net charm, respectively, provides evidence for the presence of many, experimentally yet unobserved, strange and charmed baryons in hadronic matter at temperatures close to the transition to the quark-gluon plasma [1,2]. We furthermore show that the inclusion of these resonances in the modeling of the hadronic phase of strong interaction matter leads to modifications in the prediction of freeze-out conditions in heavy ion collisions. [1] A. Bazavov et al., The melting and abundance of open charm hadrons, arXiv:1404.4043 [hep-lat]. [2] A. Bazavov et al., More strange hadrons from QCD thermodynamics and strangeness freeze-out in heavy ion collisions, arXiv:1404.6511 [hep-lat].

Speaker: Frithjof Karsch (Brookhaven National Laboraoty)

Slides Karsch_PANIC2014.pdf

38 The QCD critical end point driven by an external magnetic field in asymmetric quark matter

Presently the study of the phase diagram of QCD is the subject of both theoretical and experimental studies under extreme conditions of density and temperature. In particular, it is expected that the phenomenon of deconfinement occurs in relativistic heavy-ion collisions and in the interior of compact stars, two very different scenarios when isospin asymmetry is considered. While in heavy ion collisions the proton fraction is presently not smaller than ∼ 0.4, much smaller proton fractions are expected in the interior of neutron stars. Also the understanding of the effect of an external magnetic field on the structure of the QCD phase diagram is very important once extremely strong magnetic fields are relevant for compact objects like magnetars and are expected to affect measurements in heavy ion collisions at very high energies or the behavior of the first phases of the universe. Another degree of freedom that must be considered when discussing the QCD phase diagram is strangeness. In the interior of a neutron star it is expected that strangeness is present either in the form of hyperons, of a kaon condensate or of a core of deconfined quark matter. Beta−equilibrium is energetically favored and the Fermi pressure of neutrons is reduced if strangeness degrees of freedom are generated through the action of the weak interaction. On the other hand, the strong force governs heavy ion collisions. In this presentation the location of the critical end point (CEP) in the QCD phase diagram is discussed under different scenarios. The effect of strangeness, isospin/charge asymmetry and an external magnetic field is investigated. The discussion is performed within the 2+1 flavor Nambu-Jona-Lasinio mode with Polyakov loop (PNJL). It is shown that isospin asymmetry shifts the CEP to larger baryonic chemical potentials and smaller temperatures. At large asymmetries the CEP disappears. However, a strong enough magnetic field drives the system into a first order phase transition. [1] “Phase transition and critical end point driven by an external magnetic field in asymmetric quark matter” Pedro Costa, Márcio Ferreira, Hubert Hansen, Débora P. Menezes, Constança Providência, Phys. Rev. D89 (2014) 056013.

Speaker: Pedro Costa (Coimbra University)

Slides P_Costa_PANIC.pdf

39 photons in hot dense matter

High energy photons have been measured in heavy ion collisions, at both RHIC and LHC. The direct photons, not from decay, carries a special information of the expanding system. This is studied with (3+1)-dimensional ideal hydrodynamics, constrained with a large collection of data of various hadrons. Thus a comparison between a realistic calculation and the photon data from both RHIC and LHC will be presented and shows how the expanding hot dense matter are shining. The new information we obtained may be useful for the astrophysics, for example, for the search of dark matter. Ref. 1) F.M. Liu, K.Werner, Phys.Rev.Lett.106,242301 (2011). 2) F.M.Liu, S.X.Liu, Phys.Rev.C89,034906 (2014).

Speaker: Prof. Fu-Ming LIU (Central China Normal University)

40 Elliptic flow of thermal photons in chemically non-equilibrated QCD medium

Heavy-ion collisions provide unique opportunities to explore the phenomenology of the quark-gluon plasma (QGP), a deconfined phase of QCD. The hot medium is considered to be a strongly-coupled system because the hadronic elliptic flow -- azimuthal anisotropy in momentum space -- is large and in quantitative agreement with the hydrodynamic models with very small viscosity. The elliptic flow of direct photons is expected to be much smaller than that of hadrons as the medium is indicated to be electromagnetically transparent. However it has recently been found that the quantity is a few times larger than hydrodynamic predictions both in RHIC and LHC experiments [1, 2], posing a theoretical challenge to heavy-ion physics. In this study, I present a possible explanation for the enhancement of thermal photon elliptic flow based on late quark chemical equilibration [3]. The hot medium in transition from a gluon-rich color glass condensate to an equilibrated quark-gluon plasma should have fewer quarks in the beginning [4]. Since quarks are the source of photon emission, thermal photons are mainly produced in later stages where large anisotropy has already developed in the background medium. The numerical estimations of the (2+1)-dimensional hydrodynamic model with the quark and gluon number changing processes indicate that the slow chemical equilibration visibly enhances the elliptic flow of thermal photons. The results indicate that quark chemical equilibration plays an important role in high-energy heavy-ion collisions. References: [1] A. Adare et al. [PHENIX Collaboration], Phys. Rev. Lett. 109, 122302 (2012) [2] D. Lohner [ALICE Collaboration], J. Phys. Conf. Ser. 446, 012028 (2013). [3] A. Monnai, arXiv:1403.4225 [nucl-th] [4] A. Monnai and B. Mueller, arXiv:1403.7310 [hep-ph]

Speaker: Dr Akihiko Monnai (RIKEN BNL Research Center)

Slides panic14_monnai.pdf

Standard model physics at the TeV scale

Convener: Alexander Glazov (DESY)

41 Higgs Boson in Lepton Decay Modes at CMS

The results on the Standard Model Higgs Boson in lepton decay channels with pp collision data at 7 and 8 TeV center-of-mass energies collected by the CMS detector at the LHC will be summarized. A direct evidence of the Higgs-fermion coupling is established with the tau pair decay mode. Searches for Higgs Bosons decaying to leptons in scenarios Beyond the Standard Model such as supersymmetry will also be reported.

Speaker: Dr Somnath CHOUDHURY (DESY)

Slides PANIC-2014-Higgs-Talk.pdf

42 Measurement of the properties of New (Higgs) Boson

The precise determination of the mass, couplings and other properties of the particle discovered in 2012 around 125 GeV is important to establish precisely if it is a Standard Model Higgs boson. CMS experiment has collected lot more data since the discovery of this particle in July 2012 and has performed many of its properties measurements. In this talk, I will present some of these mea- surements. These measurements are based on data samples corresponding to integrated luminosities of up to 5.1 fb-1 at 7 TeV and up to 19.6 fb-1 at 8 TeV in proton-proton collisions at the LHC. The combined result for the measured mass, the best-fit signal for all the channels and different fits for couplings, using all the studied Higgs boson decay modes, will be described. We will also present the results obtained from the measurement of the double ratios i.e. ratio of the branching ratios between different decay modes which is an important measure- ment to establish the nature of this particle in a model independent way.

Speaker: Ms Shivali MALHOTRA (Univ. of Delhi)

Slides Panic_Higgs.pdf

43 Search for the Standard Model Higgs boson decaying to b quark with CMS experiment

A search for the Standard Model (SM) Higgs boson decaying to bottom quarks pairs is presented. Two production channels have been analyzed: vector-boson fusion and associated production with a vector boson decaying to leptons. The search is performed on data collected with the CMS detector at LHC during 2011 and 2012, at center-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of about 5.0 fb-1 and 19.0 fb-1, respectively. A 95% confidence level upper limit of 1.79 (0.89) times SM Higgs boson cross section has been observed (expected) at a Higgs boson mass of 125 GeV. An excess of events is observed above the expected background with a local significance of 2.2 standard deviations, which is consistent with the expectation from the production of the SM Higgs boson. The signal strength corresponding to this excess, relative to that of the SM Higgs boson, is 0.97+-0.48.

Speaker: Mr Silvio Donato (Univ. di Pisa e Sez. dell'INFN)

Slides Hbb.pdf

44 Measurement of the Higgs boson mass with the ATLAS detector

The latest results on the measurement of the Higgs boson mass in the diphoton and ZZ decay channels with the ATLAS detector is presented, using approximately 25 fb-1 of pp collision data collected at 7 TeV and 8 TeV in 2011 and 2012.

Speaker: Mr Oliver Kortner (Munich MPI)

Slides kortner.pdf

45 Measurement of properties of the Higgs boson in bosonic decay channels using the ATLAS detector

A detailed review of the results on the main properties of the Higgs boson in the diphoton, ZZ (with subsequent decays to four leptons), WW (with subsequent decays to lvlv) and Z-photon channels, with the ATLAS detector using approximately 25 fb-1 of pp collision data collected at 7 TeV and 8 TeV in 2011 and 2012, will be given. The measurements discussed will be the mass, couplings properties and main quantum numbers in these channels through various production processes.

Speakers: Mrs Eleonora Benhar Noccioli (Université de Genève), Mr Peter Kluit (Nikhef)

Slides Eleonora.pdf

46 Single top quark production cross section at LHC in ATLAS and CMS

Measurements of the single top quark production cross sections in proton-proton collisions with the ATLAS and CMS detectors at the Large Hadron Collider are presented. Measurements of single top-quark production in the t- and Wt-channels are shown and determination of the CKM matrix element |Vtb| is discussed. We also discuss the separate measurement of the top and anti-top quark and the ratio. These measurements are sensitive to the parton distribution function in the proton. In addition, the s-channel production is explored and limits on exotic production in single top quark processes are discussed. This also includes the search for flavour changing neutral currents and the search for additional W-F¢ bosons in the s-channel.-A

Speaker: Mr James Mueller (Pittsburgh)

Slides SingleTopProduction_mueller.pdf

Tests of symmetries and conservation laws

Convener: Dr Chloé Malbrunot (CERN)

47 Latest results from the aSPECT experiment

The aSPECT retardation spectrometer measures the electron antineutrino angular correlation coefficient a in free neutron beta decay. This measurement can be used to determine the ratio of g_A/g_V of the weak coupling constants, as well as to search for physics beyond the Standard Model. In spring/summer 2013 aSPECT had a successful beamtime at the Institut Laue-Langevin/Grenoble (France). The goal of this beamtime is to improve the current uncertainty of a from ∆a⁄a≈5% to about 1%. To achieve this goal the systematics of aSPECT have to be understood accordingly. This is achieved via systematic tests, measurements of a with different systematic parameter settings during the beamtime and measurements afterwards, like the work-function fluctuations of electrodes or the magnetic field ratio of our MAC-E filter. Sophisticated simulations of our spectrometer are used to understand and reduce further the systematic uncertainties of our spectrometer. In this talk we will present an overview of the current status of the data analysis for the beamtime 2013. This work is supported by the DFG SPP 1491.

Speaker: Mr Alexander Wunderle (Johannes Gutenberg Universität Mainz)

Slides PANIC_2014_Wunderle.pptx

48 Ultracold Neutron Physics at the Los Alamos National Laboratory

The Ultracold Neutron Facility at the Los Alamos Neutron Science Center has developed one of the highest density sources of UCN in the world to perform precision measurements of neutron decay observables. The UCNA collaboration has recently published a sub-percent measurement of the beta-asymmetry, A0 = -0.11954 ± 55(stat) ± 98(sys), used to extract λ = gA/gV = -1.2756 ± 30, the ratio of the axial-vector and vector coupling constants. The 2011-2013 UCNA data set is expected to provide a modest improvement to the accuracy of the UCNA value of λ with a precision of about 0.6%, limited by the statistical uncertainty. The systematic error budget, however, is expected to improve dramatically, by over a factor of three, setting the stage for further refinement in the value of λ when higher decay rates become available. The UCNB experiment has demonstrated the first coincident detection of electrons and protons from neutron decay, and has performed a first attempt to measure the neutrino asymmetry B using 15 out of 128 pixels instrumented on the novel thick, large area, highly segmented silicon detector. The UCNτ collaboration has recently performed a successful demonstration of the UCN storage trap, with a storage time of τ = 860 ± 19 s, and is evaluating new experimental techniques that will allow development of a magneto-gravitational trap capable of achieving 0.1 s precision in the neutron lifetime. An effort to determine the neutron EDM using ultracold neutrons is now being developed, with an ultimate sensitivity goal of δd ~ 10^(-27) e-cm. An overview of these experiments, their utility for constraining beyond standard model physics, and latest results will be presented, as well as goals for the 2014 accelerator cycle.

Speaker: Mrs Leah Broussard (Los Alamos National Laboratory)

Slides Broussard-PANIC14.pdf

49 Measuring the neutron lifetime using a magneto-gravitational trap for ultracold neurons

Recent measurements of the neutron lifetime have individually reported uncertainties of about 1 s but disagree by as much 7 s, resulting in a shift of about 6.5 sigma in the accepted value over recent years. Measurements based on the decay in flight of cold neutron beams appear to yield longer lifetimes than those based on counting surviving ultracold neutrons after storage in material-walled traps. The present storage experiments are challenged by the existence of multiple neutron loss mechanisms in the trap that act with characteristic times similar to the neutron lifetime of 880.1 (1.1) s, such as absorption or upscatter of the neutrons on the material trap walls and escape of unbound neutrons from quasi-stable orbits within the trap. Also, the efficiency of detection of the surviving trapped neutrons can vary with time due to evolution of neutron population into different regions of phase space within the trap. Therefore, a new experiment, UCNt, is now being developed at Los Alamos National Lab to eliminate these systematic effects by storing the ultracold neutrons in an asymmetric magneto-gravitational trap, in which the neutrons: 1) never interact with a material surface during their storage time in the trap; 2) rapidly populate all of the energetically accessible phase space; and 3) are detected rapidly at the end of the storage time by a novel in-trap integrating activation detector. The trap consists of a bowl-shaped Halbach array of neodymium-iron permanent magnets capable of repelling neutrons with a kinetic energy of up to 50 neV and is closed on the top by gravity. The neutron detector consists of an absorbing vanadium foil which is lowered into the trap from above to collect the surviving neutrons, then withdrawn to an ex situ activation counter. We will present results of the first neutron storage measurement in the trap and results from commissioning the vanadium activation detector, along with our plans to investigate systematic effects in the experiment with the immediate goal of reaching sufficient precision to resolve the difference between the beam and bottle experiments.

Speaker: Dr Alexander Saunders (Los Alamos National Lab)

Slides saunders_PANIC_2014.pdf saunders_PANIC_2014.pptx

50 Search for T-Invariance Violation in the Proton-Deuteron Scattering

Time-reversal invariance will be tested in proton-deuteron scattering via an internal target transmission experiment at COSY[1].The polarization asymmetry Ay,xz will be measured using a polarized proton beam (polarization Py) and polarized deuterium target (tensor polarization Pxz). For P-parity conserving interactions this observable provides a real null test of time-reversal invariance which is not affected by the final state interaction [2]. In order to control background conditions of this experiment one has to know the magnitude of several T-even, P-even spin-observables in pd scattering at energy of the planned experiment 100-200 MeV. In the present work the differential spin observables of the elastic pd scattering and total pd cross sections for polarized proton and deuteron are calculated within the Glauber theory. We use the formalism of Ref. [4] and develop it for inclusion of T-odd pN amplitudes. Furthermore, we properly modify the formalism of Ref. [4] to make a comparison with existing experimental data. The results of our calculations for unpolarized differential cross section, vector Ay and tensor Aij analyzing powers, spin correlation parameters Cij, Cij,k and spin-transfer coefficients Kji’ at 135 MeV and 250 MeV are in a reasonable agreement with the data [5,6] in forward hemisphere. We found that Coulomb interaction does not lead to divergences for the Ay,xz observable. The total hadronic polarized cross sections sigma1, sigma2, sigma3 (as defined in Ref. [3]) are calculated using the generalized optical theorem similarly to Ref. [7]. The obtained result for sigma1 put a strong restriction on the magnitude of the false vector polarization of the deuteron (Py <10-6) caused by the planned accuracy of the T-odd effect measurement of about 10-6 [1]. Energy dependence of the Ay,xz observable is calculated for several types of T-odd NN-interactions. This dependence differs from that found in Ref. [8] where only a breakup mechanism was accounted. 1.COSY Proposal N 215,"Test of Time reversal invariance in proton-deuteron scattering at COSY", P.D. Eversheim, B.Lorentz, Yu. Valdau –Spokespersons(2012). 2. H.E. Conzett. Phys. Rev. C 48 (1993) 423. 3. Yu.N. Uzikov, J.Haidenbauer. Phys. Rev. C 79 (2009) 024617. 4. M.N. Platonova, V.I. Kukulin. Phys. Rev. C 81 (2010) 014004. 5. K. Sekiguchi et al. Phys. Rev. C 65 (2002) 034003. 6. B. von Przewoski et al. Phys. Rev. C 74 (2006) 064003. 7. Yu.N.Uzikov, J.Haidenbauer. Phys. Rev. C 87 (2013) 054003. 8. M. Beyer. Nucl. Phys. A560 (1993) 895.

Speaker: Prof. yury Uzikov (Joint Institute for Nuclear Researches)

Slides panic14.pdf

51 Precision tests of the Standard Model with kaon decays at CERN

Recent results and prospects for precision tests of the Standard Model in kaon decay in flight experiments at CERN are presented. A measurement of the ratio of leptonic decay rates of the charged kaon at a 0.4% precision constrains the parameter space of new physics models with extended Higgs sector, a fourth generation of quarks and leptons or sterile neutrinos. Searches for heavy neutrino mass states and the dark photon in the ~100 MeV/c$^2$ mass range based on samples collected in 2003-2007 are in progress and prospects will be discussed. The NA62 experiment starting in 2014 will search for a range of lepton number and lepton flavour violating decays of the charged kaon and the neutral pion at improved sensitivities down to ~$10^{-12}$, which will probe new physics scenarios involving heavy Majorana neutrinos or R-parity violating SUSY.

Speaker: Mr Tommaso Spadaro (INFN)

Slides spadaro_PANIC2014.pptx.pdf

16:00 Coffee Break

Dark matter and cosmology

Convener: Mr Davide D'Angelo (Universita' degli Studi di Milano)

52 Current status of the Dark Matter search experiment CRESST

CRESST is a cryogenic direct Dark Matter search experiment based on phonon-light technique. It is aiming for the detection of weakly interacting massive particles (WIMPs) via their elastic scattering off nuclei in CaWO4 target crystals. Significant improvements have been achieved with respect to previous measuring campaigns in terms of the intrinsic radiopurity of CaWO4 crystals and the rejection of recoil events from alpha decays near surfaces. In this contribution, the related changes in the detector design will be discussed. Based on the first ~30 kg-live-days of data acquired by a single CaWO4 detector of the new design, we will present limits for the spin-independent WIMP-nucleon cross section, in particular down to WIMP masses of 1 GeV.

Speaker: Mr Holger Kluck (HEPHY)

Slides Kluck_PANIC2014.pptx

53 Dark Matter Searches with the XENON100 and XENON1T Experiment

The XENON100 detector, which is being operated at the Gran Sasso Underground Laboratory, is a dual phase (liquid-gas) xenon time-projection chamber for particle detection. The total amount of liquid xenon is 161 kg, of which 62 kg are in the active target enclosed in a Teflon/copper structure, the rest being in the surrounding active veto. The direct and proportional UV light signal produced by particle interactions is detected by 242 PMTs. To-date XENON100 is one of the most sensitive detector for direct dark matter detection, and has set limits on the spin-independent elastic WIMP-nucleon scattering for WIMP masses above 8 GeV/c^2, with a minimum cross section of 2e-45 cm^2 at 55 GeV/c^2 at 90% confidence level. XENON1T, the next generation Dark Matter Experiment, is being under construction and will house a total amount of 3t of xenon with a fiducial mass of about 1t and a science goal of 2e-47 cm^2 at 100 GeV/c^2. Therefore it has a 100 times lower intrinsic background than XENON100 and it is surrounded by a water tank that acts as an active muon veto. In order to detect the scintillation light from particle interactions with the xenon target, 248 3-inch photomultiplier tubes will be installed on the top and bottom of the TPC. It is planned to upgrade the Experiment to XENONnT with a fiducial target volume of about 4t during the run of XENON1T. In this talk, the present the results of the XENON100 experiment and the status of the near-future plans of the XENON collaboration will be reported.

Speaker: Mr Gaudenz Kessler (Universität Zürich)

Slides kessler_PANIC_xenon.pdf

54 Dark matter annihilation in the core of a neutron star

Gravitational accretion of dark matter in neutron stars may constitute a mechanism to check for further indirect effects of its existence. In this way, dark matter annihilations taking place within such compact astrophysical objects may prevent the appearance of additional particle population of hadrons inside the neutron star core. We discuss on the experimental consequences of this possibility.

Speaker: Dr M. Angeles Perez-Garcia (University of Salamanca, Spain)

Slides v3_panic_2014_m.angelesperezUSAL.ppt

55 PICO - Bubble Chambers for Dark Matter

The recently formed PICO collaboration, a merger of COUPP and PICASSO, is designing a 250L bubble chamber to search for dark matter in the form of Weakly Interacting Massive Particles (WIMPs). This experiment will have nearly four orders of magnitude greater sensitivity to spin-dependent WIMP-nucleon interactions as compared to our existing world-best results. We operate bubble chambers with thresholds below 3 keV in nuclear recoil energy and with electron recoil background rejection better than 10^{9}. This impressive sensitivity will probe a broad range models for WIMP dark matter that experiments concentrating on spin-independent couplings cannot reach. We are presently operating the PICO-2L and COUPP-60 bubble chambers deep underground to test systems that will be used in the 250L experiment and to extend our dark matter search limits. Recent results and calibrations from these experiments will be presented.

Speaker: Mr Alan Robinson (University of Chicago)

Slides PICO.pdf

Flavour physics - CKM and beyond

Convener: Carsten Niebuhr (DESY)

56 Prospects for K+ ->pi+ nu nu observation at CERN in NA62

The rare decays K+ ->pi+ nu nu are excellent processes to make tests of new physics at the highest scale complementary to LHC thanks to their theoretically cleaness. The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking, keeping the background at the level of 10%. Part of the experimental apparatus has been commissioned during a technical run in 2012. The physics prospects and the status of the experiment will be reviewed in view of the first physics run scheduled for 2014.

Speaker: Mr Giuseppe Ruggiero (CERN)

Slides ruggiero_panic.pptx

57 ChiPT tests at NA48 and NA62 experiments at CERN

New final results from an analysis of about 400 K+- --> pi+- gamma gamma rare decay candidates collected by the NA48/2 and NA62 experiments at CERN during low intensity runs with minimum bias trigger configurations are presented. The results include a model-independent decay rate measurement and fits to Chiral Perturbation Theory (ChPT) description. The data support the ChPT prediction for a cusp in the di-photon invariant mass spectrum at the two pion threshold.

Speaker: Mr Flavio COSTANTINI (INFN and University of Pisa)

Slides PANIC_14_V5.PDF

58 Detailed study of the Ke4 decay mode properties

The NA48/2 Collaboration at CERN has accumulated unprecedented statistics of rare kaon decays in the Ke4 modes Ke4(+-) to pi+ pi- e nu and Ke4(00) to pi0 pi0 e nu with ~one percent background contamination. The detailed study of form factors is sensitive to small isospin symmetry breaking effects. This brings new inputs to low energy QCD description and crucial tests of predictions from Chiral Perturbation Theory and lattice QCD calculations.

Speaker: Dr Patrizia Cenci (University of Perugia and INFN)

Slides Cenci@PANIC2014.pdf

59 Status of the Fermilab Muon g-2 Experiment

The anomalous magnetic dipole moment of the muon can be both measured and computed to very high precision, making it a powerful probe to test the standard model and search for new physics such as SUSY. The previous measurement by the Brookhaven E821 experiment found a 3.6 standard deviation discrepancy from the predicted value. The new g-2 experiment at Fermilab will improve the precision by a factor of four through a factor of twenty increase in statistics and a reduced systematic uncertainty with an upgraded apparatus. The experiment will also carry out an improved search for a muon electric dipole moment. Construction at Fermilab is well underway.

Speaker: Prof. Kawall David (University of Massachusetts)

Slides panic.pdf

Hadrons in medium - hyperons and mesons in nuclear matter

Convener: Dr Janus Weil (FIAS)

60 The Role of Resonances in p+p Reactions associated with Strangeness Production

The understanding of p+p reactions is fundamental for the interpretation of p+A and also heavy-ion collisions, in which in-medium modifications of hadrons are expected with increasing nuclear matter density. Such modifications can be investigated by comparisons of experimental data to transport models [1,2,3]. Hence, the models should be able to reproduce elementary reactions at the first place. In this contribution we present high statistics K0S data associated with resonance formations in p+p collisions at Ekin = 3.5 GeV measured by the HADES detector at GSI (Darmstadt, Germany). The measurement of this energy regime is of particular importance not only because no data is available at these intermediate energies, but also because it is not clear, whether the processes are dominated by resonance productions or already need to be described via string models (e.g. PYTHIA or FRITIOF) in the transport calculations. In both cases the constraints put up by this measurement for the transport models will be essential for the interpretation of the physics measured by HADES and CBM at the future FAIR facility. The high acceptance and resolution of the HADES spectrometer allows to study exclusive K0S reactions with the focus on the channels p + p -> Y + Delta^{++} + K0S and p + p -> Y + p + pi^{+} + K0S (with Y being either a Lambda or a Sigma^{0}). In particular, the role played by the Delta^{++} resonance has been addressed. The ability to distinguish the resonant from the non-resonant reactions, as well as the Lambda from the Sigma^{0} reactions will be demonstrated in the contribution. This enables us to extract exclusive cross sections as well as angular distributions of the mentioned reactions, which is especially interesting in the case of p + p -> Sigma^{0} + Delta^{++} + K0S , as this reaction has not been measured at other energies before. Finally, the published results [4] can be used as a basis for future studies of p+A and heavy-ion reactions. [1] G. Agakishiev et al., Phys. Rev. C 82, 044907 (2010). [2] M. Büscher et al., Eur. Phys. J. A 22, 301-317 (2004). [3] M.L. Benabderrahmane et al., PRL 102, 182501 (2009). [4] G. Agakishiev et al., arXiv:1403.6662 [nucl-ex] (2014).

Speaker: Mrs Jia-Chii Berger-Chen (Excellence Cluster Universe, TU München)

Slides PANIC14_jbergerchen_V2.pdf

61 Cascade production in antikaon reactions with protons and nuclei

We study the meson-baryon interaction in S-wave in the strangeness S=-1 sector using a chiral SU(3) Lagrangian extended to next-to-leading order (NLO). Our model has 7 new parameters, which have to do with NLO terms in the chiral Lagrangian, and which are fitted to the large set of experimental data available for different two-body channels. We pay particular attention to the K- p --> K Cascade reactions, where the effect of the NLO terms in the Lagrangian is very important. In order to improve our model in these particular channels, we take into account phenomenologically the effects of the high spin hyperonic resonances, namely Sigma(2030) (7/2^+) and Sigma(2250) (5/2^-). Some preliminary results can be found in Refs. [1]. Finally, the developed model is applied to simulate the Cascade production in nuclei. [1] V.K. Magas, A. Feijoo Aliau, A. Ramos, arXiv:1311.5025 [hep-ph]; arXiv:1402.3971 [hep-ph].

Speaker: Prof. Volodymyr Magas (University of Barcelona)

Slides Magas_talk_Panic_2014.pdf

62 Eta’ mesic nucleus spectroscopy with (p,d) reaction at GSI

We plan a missing-mass spectroscopy experiment of eta’ mesic nuclei to study　in-medium properties of the eta' meson. The large mass of the eta’ meson compared to the other pseudoscalar mesons is explained by the axial anomaly effect. Since this effect on the eta’ mass is associated with spontaneous breaking of chiral symmetry, in the nuclear medium, where chiral symmetry is partially restored, the mass of the eta’ meson may be reduced. Then, such a mass reduction serves as attractive potential in an eta’-nucleus system and eta’ meson nucleus bound states may exist. The experiment is planned at GSI using a 2.5 GeV proton beam accelerated by SIS (Heavy Ion Synchrotron). We will inject the proton beam onto a carbon target to produce eta’ mesic nuclei by the 12C(p,d) reaction. The missing-mass spectrum of the reaction will be obtained by analyzing the momentum of the ejectile deuteron with the FRS (Fragment Separator) used as a spectrometer. The first pilot experiment will be carried out in July-August 2014. In this contribution, we would like to report the status of the experiment and describe very preliminary analysis.

Speaker: Yoshiki K. Tanaka (University of Tokyo)

Slides PANIC2014_ver3.pdf

63 Exploring strangeness with HADES

The standard model of particle physics contains three generations of quarks, whereas most of the matter is built out of quarks from the first generation, the up- and down-quarks. Nevertheless, strange quarks confined in hyperons can play an important role for example in compact astrophysical objects. Calculations show, that it is likely that hyperons appear at large nuclear densities which are realized in the interior of neutron stars. This appearance has interesting effects e.g. a softening of the equation of state, which leads to a reduction of the maximal mass of the star. For precise calculations it is necessary to know how particles with strangeness content interact with normal nuclear matter. With the High Acceptance Di-Electron Spectrometer (HADES) located at GSI Helmholtzzentrum für Schwerionenforschung and working at the SIS18 accelerator (1-2 AGeV) various results dealing with strangeness physics were obtained. The whole setup was designed to measure the modification of hadrons (mainly vector mesons) when embedded in a nuclear medium but appeared to be also very succesful in studies of strangeness production. Reactions of two colliding protons deliver a starting point for the interpretation of more complex systems like pA or AA collisions. With pp collisions at 3.5 GeV we have investigated the formation of resonances like the Λ(1405) which is predicted to be a molecular like state generated dynamically by the attractive interaction of an antikaon and a nucleon below its threshold. It turned out that the line shape of the resonance and the position of the pole mass reveal interesting facts about the underlying physics of this resonance. We have also searched for the existence of a hypothetical nuclear state, the kaonic cluster, which is formed out of two nucleons and an antikaon often abbreviated as ppK^− reported by other experiments. From theory side predictions for the binding energy and width of this state diverge. It is, therefore, necessary to set stronger constraints from experimental side. With HADES also p+Nb reactions were measured where the kinetic energy of the proton was also 3.5 GeV. In this colliding system, one can already explore in-medium effects on particles at saturation density ρ0, in particular the modification of neutral kaons K^0 by a repulsive mean-field potential which is created by the nuclear environment. The data support a value of the repulsive potential for K^0 at rest of about 35 MeV at saturation density. The advantage in pA systems is the fixed density profile of the nucleus and we do not have to deal with a rapid evolution like in AA reactions. For this reason the meaured p+Nb serves as a link between elementary pp and the most complex AA reactions. HADES was recently upgraded and measurements of Au+Au collisions at 1.23 AGeV were performed with which it is now also possible to study effects of compressed matter at SIS18 energies.

Speaker: Dr Kirill Lapidus (TU München)

Slides panic_2014_lapidus_nd.pdf

Neutrinos and related astrophysical implications

Convener: Prof. Janet Conrad (MIT)

64 Project 8: Towards a Radio Frequency Measurement of the Neutrino Mass

Project 8 aims to determine the neutrino mass from the beta-decay of tritium (Q = 18.6 keV). Since the cyclotron frequency of a charged particle traveling in a homogeneous magnetic field is inversely proportional to its total energy, a measurement of this frequency provides accurate knowledge of the particle's total energy. This allows the reconstruction of the electron energy spectrum from a frequency measurement. We intend to detect the cyclotron radiation of single electrons emitted in the beta-decay. Important advantages of this novel approach are superior energy resolution and scalability. In the current phase the collaboration aims to demonstrate the feasibility to detect the cyclotron radiation emitted from single mono-energetic electrons ($E_{e,1}$ = 17.8 keV and $E_{e,2}$ = 30.2 keV) released in the decay of $\mathrm{^{83m}Kr}$ in a 1 T magnetic field. We will discuss the progress in commissioning the new prototype experiment, signal detection techniques and signal analysis.

Speaker: Dr Martin Fertl (University of Washington)

Slides Fertl_PANIC2014_08_2014_Release.pdf

65 Status of the Karlsruhe Tritium Neutrino Experiment KATRIN

Neutrino properties, and in particular the open question regarding the scale of neutrino rest masses, bear fundamental relevance to many current research topics in cosmology, theoretical particle physics, and astroparticle physics. Due to the smallness of neutrino masses, the determination of their absolute scale is a challenging experimental task. Precision measurements of the kinematics of weak decays represent the only model independent approach to address this question in a laboratory experiment. The most mature technique relies on the spectroscopy of tritium beta-decay near its kinematic endpoint at 18.6 keV. The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to improve the neutrino mass sensitivity obtained through this method by an order of magnitude to 200 meV/c2 (90% C.L.). To this end, KATRIN utilizes an ultra-luminous molecular gaseous tritium source, a differential and a cryogenic pumping section, a high-resolution electrostatic spectrometer of MAC-E filter type, and a multi-pixel silicon semiconductor detector. The experiment is currently being constructed at the Karlsruhe Institute of Technology. This talk will present an overview of the status of the major components and report results from the ongoing commissioning of the spectrometer and detector section.

Speaker: Dr Kathrin Valerius (KCETA, Karlsruhe Institute of Technology)

Slides track3_080_KValerius_KATRIN.pdf

66 Search for Sterile Neutrinos with the Borexino Detector

Several observed anomalies in the neutrino sector could be explained by a fourth (sterile) neutrino with a squared mass difference in the order of 1eV² to the other three standard neutrinos. This hypothesis can be tested with an artificial MCi neutrino (Cr-51) or a kCi antineutrino (Ce-144/Pr-144) source deployed near or inside a large low background detector like Borexino. The SOX project (Short baseline neutrino Oscillation with BoreXino) aims for the detection of sterile neutrinos and will also allow to measure the neutrino magnetic moment, the electroweak mixing angle as well as the axial and vector coupling constants at low energy. This talk will summarize the SOX concept and will show the expected sensitivities for the three possible phases of the experiment.

Speaker: Mr Mikko Meyer (University of Hamburg)

Slides Meyer_Borexino_Sterile_Neutrinos_Panic2014

67 Search for sterile neutrino oscillations in the short-baseline reactor experiments Nucifer and Stereo

The question of the existence of sterile states for neutrinos is addressed since many years. If they exist such states would not be directly detected but could mix with the three ordinary states and would be “seen” as new oscillations in the propagation of the neutrinos. Recently this question arose by the observation of a small deficit of anti-neutrinos with respect to predictions by previous anti-neutrino oscillation experiments at short distance from reactors. If proven, the existence of this particle would be a major discovery, with deep impact in particle physics and cosmology. The goal of the Stereo experiment is to probe the existence of a new oscillation at short distance with a detector located at ten meters from the core of the ILL research reactor. The design of the detector with six independent cells will allow to measure the neutrino energy spectrum as a function of the distance from the core. It follows a running short-range experiment Nucifer where a one–cell detector is placed at 7 m from the core of the Osiris research reactor. Stereo is currently under construction and the data-taking will start at the beginning of 2015. After a short review of existing experiments searching for a new sterile state, we will describe in detail the Nucifer and Stereo experiments, present the first results from the Nucifer experiment and detail the background problematics and the systematic uncertainty budget. Finally, expected sensitivities on the neutrino parameters, the mixing angle and the squared mass difference, will be presented.

Speaker: Dr Alain Letourneau (CEA-Saclay)

Slides 04_PANIC2014.pdf

68 GERDA: Phase I results & upgrade for Phase II

The Germanium Detector Array (GERDA) experiment, located underground in the Gran Sasso National Laboratory of INFN, Italy, is searching for the neutrinoless double beta decay (0nbb) of Ge-76. It uses a new shielding concept by operating bare Ge diodes enriched in Ge-76 in 64 m^3 of liquid argon supplemented by a 3m thick layer of water. The experiment aims at exploring the 0nbb decay up to a half life of 1.4x10^26 yr in two phases: Phase I of the experiment has been concluded last year. No signal is observed and the so far best limit is derived for the half life of the 0nbb decay of Ge-76, T1/20n > 2.1x10^25 yr (90% C.L.), after an exposure of 21.6 kg yr. The result refutes an earlier claim of discovery with high probability. The background index of 1x10^-2 cts/(keV kg yr) is lower by about one order of magnitude compared to previous experiments. The upgrade to GERDA PhaseII is in progress. It strives for a further reduction of background by another order of magnitude to a level of 10^-3 cts/(keV kg yr). The detector mass will be increased by ~20 kg of new Broad Energy Germanium (BEGe) detectors from enriched Ge-76, which exhibit superior pulse shape discrimination and hence background rejection power. Low mass detector holders, cold front-end electronics, contacting and cabling schemes are redesigned for ultra low mass and radiopurity. In addition, a retractable liquid argon veto system will be installed to efficiently suppress backgrounds that induce scintillation light in the liquid argon. A hybrid solution of photomultipliers and silicon photomultipliers coupled to scintillating fibers was chosen. This talk gives an account of the results and the challenging modifications to meet our design goals.

Speaker: Ms Anne Wegmann (Max-Planck Institut für Kernphysik)

Slides PANIC_2014-08-25_ACW.pdf

New concepts and techniques for accelerators and particle detectors

Convener: Dr Frank Simon (Max-Planck-Institute for Physics)

69 Pileup subtraction at the particle level

The ability to correct jets and jet shapes for the contributions of multiple uncorrelated proton-proton interactions (pileup) largely determines the ability to identify new physics via highly boosted hadronic decays of W, Z, and Higgs bosons, or top quarks. We present a new method that operates at the level of the jet constituents and provides both a performance improvement and a simplification compared to existing methods. Comparisons of the new method with existing methods along with predictions of the impact of pileup during the LHC run II will be presented. We will also discuss methods that may improve the determination of the missing pt in high pileup environment and a connection between pileup subtraction and the underlying event subtraction in heavy ion collisions.

Speaker: Dr Spousta Martin (Charles University)

Slides Spousta_Panic2014_Subtraction_20140825.pdf

70 ATLAS Upgrades for the next Decades

After the successful LHC operation at the center-of-mass energies of 7 and 8 TeV in 2010 - 2012, plans are actively advancing for a series of upgrades of the accelerator, culminating roughly ten years from now in the high luminosity LHC (HL-LHC) project, delivering of the order of five times the LHC nominal instantaneous luminosity along with luminosity leveling. The final goal is to extend the dataset from about few hundred fb−1 expected for LHC running to 3000 fb−1 by around 2035 for ATLAS and CMS. In parallel the experiments need to be keep lockstep with the accelerator to accommodate running beyond the nominal luminosity this decade. Current planning in ATLAS envisions significant upgrades to the detector during the consolidation of the LHC to reach full LHC energy and further upgrades. The challenge of coping with the HL-LHC instantaneous and integrated luminosity, along with the associated radiation levels, requires further major changes to the ATLAS detector. The designs are developing rapidly for a new all-silicon tracker, significant upgrades of the calorimeter and muon systems, as well as improved triggers and data acquisition. This report summarizes various improvements to the ATLAS detector required to cope with the anticipated evolution of the LHC luminosity during this decade and the next.

Speaker: Dr Ingrid-Maria Gregor (DESY)

Slides PANIC_ATLASupgrade.pdf

71 Perspectives of the CMS phase-II upgrade for HL-LHC

The LHC phase-II upgrade will provide considerably higher annual luminosities leading to a total of 3000 fb-1. This data will allow precision measurements of Higgs properties, vector boson scattering and substantially higher sensitivities in searches for new physics in particular for rare processes. Detectors will need to be upgraded in order to operate in such a high rate and high radiation en- vironment at the HL-LHC. Embedded in a large upgrade program, CMS will receive new tracking and new forward instrumentation for calorimetry and muon tagging along with an increase in acceptance. The CMS upgrade program and the expected performance will be reviewed.

Speaker: Mr David Anthony Petyt (RAL)

Slides petyt_panic2014_final.pdf

72 Evolution studies of the CMS ECAL endcap response and upgrade design options for High-Luminosity LHC

High-Luminosity running at the LHC, which is planned for 2022 and beyond, will imply an order of magnitude increase in radiation levels and particle fluences with respect to the present LHC running conditions. The performance evolution of the CMS electromagnetic calorimeter (ECAL), comprising 75,848 scintillating lead tungstate crystals, indicates that an upgrade of its endcaps will be needed for HL-LHC running, to ensure an adequate performance. Results from LHC collision periods, beam tests and laboratory measurements of proton-irradiated crystals are combined to predict the performance of the current detector at the HL-LHC. In addition, an overview is given of various R&D studies towards a replacement of the ECAL endcaps for the HL-LHC running period.

Speaker: Mr Marco Peruzzi

Slides talk_peruzzi_panic2014.pdf

Quarks and gluons in hadrons, the hadron spectrum

Convener: Dr Michel Guidal (Institut de Physique Nucleaire, Orsay)

73 Recent results on TMDs from the HERMES Experiment

In the last decade, transverse-momentum distributions (TMD) have been recognized as crucial ingredients for a complete understanding of the nucleon structure. They allow for a three-dimensional description of the nucleon (nucleon tomography) in momentum space and could provide insights into the yet unmeasured quark orbital angular momentum through correlations between the quark transverse momentum with the quark or the nucleon spin (spin-orbit correlations). At HERMES, TMDs are probed for various hadron types through the analysis of specific azimuthal modulations of the semi-inclusive deep-inelastic-scattering cross-section as well as in inclusive hadron leptoproduction from transversely polarized protons. An overview of recent HERMES results will be presented.

Speaker: Dr Ami Rostomyan (DESY)

Slides 2014_Panic_Rostomyan.pdf

74 Transverse structure of the nucleon at COMPASS

COMPASS is a fixed target experiment at the CERN SPS M2 beam line, taking data since year 2002. Part of its physics programme is dedicated to study the transverse spin and the transverse momentum structure of the nucleon using semi- inclusive deeply inelastic lepton scattering (SIDIS). For these measurements, data have been collected using transversely polarised proton (NH3) and deuteron (6LiD) targets. A selection of recent results on the azimuthal asymmetries measured from the data collected with transversely polarised targets is presented, with particular focus on the most recent measurements from the data collected in 2007 and 2010 with the proton target. These results covers Collins, Sivers asymmetries versus different combination of kinematic variables as well as the transverse spin asymmetries in dihadron production.

Speaker: Mr Nour Makke (INFN/University of Trieste & ICTP)

Slides Makke_Panic14.pdf

75 Exploring Gluon and Antiquark Polarization in the Proton with STAR

The STAR Collaboration is performing a wide range of measurements to determine the gluon and antiquark helicity distributions in the proton. The longitudinal double-spin asymmetries, $A_{LL}$, for inclusive jet and dijet production provide direct access to the gluon polarization. The parity-violating single-spin asymmetries, $A_L$, for $W^{+/-}$ production are sensitive to the $\bar{u}$ and $\bar{d}$ antiquark polarizations. STAR recorded large polarized proton data sets in 2009 at $\sqrt{s}$ = 200 GeV and in 2012 and 2013 at $\sqrt{s}$ = 510 GeV. The 2009 mid-rapidity inclusive jet $A_{LL}$ results place stringent new constraints on the polarized gluon distribution and provide evidence for positive gluon polarization in the Bjorken-$x$ region $x > 0.05$. The 2012 $W$ asymmetry results show a preference for a sizable, positive $\bar{u}$ antiquark polarization in the range $0.05 < x < 0.2$. The inclusive jet $A_{LL}$ and $W$ $A_L$ measurements will be discussed, and status reports will be provided regarding similar measurements with the more recent data sets.

Speaker: Mr Carl Gagliardi (Texas A&amp;M University)

Slides Gagliardi_PANIC2014_final.pdf

76 Probing Low x Gluons at STAR with Forward Asymmetry Measurements

One of the major goals of the proton spin physics program at RHIC at BNL is to constrain the gluon polarization distribution $\Delta g(x)$ and thus determine the contribution of gluons to the spin of the proton. Measurements of spin asymmetries with jets and neutral pions at central pseudorapidities at STAR and PHENIX have been critical to this effort. A recent global analysis has, for the first time, yielded evidence of a positive $\Delta g$ in the region $0.05 < x < 0.2$. But, the gluon polarization remains under-constrained for the region $x < 0.05$. A variety of measurements at STAR are planned and underway to better constrain the low-$x$ gluon distribution with asymmetry measurements at non-central, intermediate and forward, pseudorapidities using neutral pion and dijet probes. The STAR endcap electromagnetic calorimeter (EEMC) allows measurements of photonic channels in an intermediate pseudorapidity range, $0.8 < \eta < 2.0$. Results of a recent publication of the $\pi^{0}$ double longitudinal spin asymmetry, $A_{LL}$, at $\sqrt{s} = 200$ GeV will be presented. The status of measurements in the EEMC with much larger datasets, at $\sqrt{s} = 510$ GeV, will be discussed, with the prospect of probing significantly lower $x$ gluons. In an even more forward placement, the STAR forward electromagnetic calorimeter (called FMS) covers $2.65 < \eta < 4.0$. Prospects of, and progress toward, measuring $A_{LL}$ for neutral pions in the FMS with the large 2013 dataset at $\sqrt{s} = 510$ GeV will be discussed. Finally, proposed forward upgrades at STAR envision both electromagnetic and hadronic calorimetry in a pseudorapidity range similar to that currently covered by the FMS. The case of forward dijet production, and $A_{LL}$, at $\sqrt{s} = 500$ GeV with an upgraded detector will be presented, with the possibility of probing $\Delta g$ at values as low as $10^{-3}$ in $x$.

Speaker: Mr Adam Gibson (Valparaiso University)

Slides 2014-08-25-PANIC-STARLowX-Gibson.pdf

77 COMPASS results on the nucleon longitudinal spin structure

We present recent COMPASS results on the longitudinal spin structure of the nucleon. Results from measurements of the gluon helicity Delta G (x) from various channels are shown. We recently analysed longitudinal double spin asymmetry A_LL(pT) for single hadron production with high-pT hadrons in the low Q2 regime using all COMPASS data. LiD and NH3 were used as polarized deuteron and proton targets. The asymmetries, which are almost consistent with zero, are compared to theoretical predictions with various Delta G hypotheses. The latest data on the proton spin structure function g1 in the DIS regime extend the kinematic domain towards a smaller value of the Bjorken scaling variable x (0.0036) and higher values of Q2 (up to 100 (GeV/c)2). The data are used in a global QCD NLO fit of polarized DIS world data to constrain the value of the quark spin contribution Delta Sigma to the nucleon spin. The dominant uncertainty results from the choice of the functional forms and in particular of the one taken for the gluon spin contribution Delta G(x).

Speaker: Mr Hiroki MATSUDA (Yamagata University)

Slides hmatsuda_panic2014.pdf

Quarks and gluons in hot and dense matter

Convener: Frithjof Karsch (Brookhaven National Laboraoty)

78 $J/\psi$ production at the STAR experiment

Suppression of $J/\psi$ production in heavy-ion collisions due to color screening of quark and antiquark potential in the deconfined medium has been proposed as a signature of quark-gluon plasma (QGP) formation. However, there are other effects that may alter the observed $J/\psi$ yields, such as cold nuclear matter effects, and statistical coalescence of c-$\bar{\mathrm{c}}$ pairs. Indeed, recent measurements in Au+Au and d+Au collisions show that these effects play a non-negligible role. Measurements of $J/\psi$ invariant yields and elliptic flow ($v_2$) in different collision energies, collision systems, and centralities can shed new light on understanding the interplay of these effects for $J/\psi$ production and properties of the QGP. In this talk I will report STAR measurements of $J/\psi$ production at mid-rapidity, reconstructed via the dielectron decay channel, in Au+Au collisions at $\sqrt{s_{NN}} =$ 39 GeV, 62.4 GeV, 200 GeV together with results from U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV. Nuclear modification factor will be shown as a function of centrality and $p_T$. I will also present results on $J/\psi$ $v_2$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.

Speaker: Dr Petr Chaloupka (Czech Technical University in Prague)

Slides PANIC_Chaloupka.pdf

79 Upsilon production in U+U collisions at the STAR experiment

Due to color screening, the production of quarkonia in high energy heavy ion collisions is expected to be sensitive to the energy density of the medium. Sequential suppression of different quarkonium states may therefore serve as a thermometer of the medium. Although the suppression of charmonia was anticipated as a key signature of the QGP, the observed energy dependence of $J/\psi$ suppression is rather weak. This phenomenon is explained by the recombination (coalescence) of $c\bar{c}$ pairs. Bottomonia, on the other hand, are less affected by recombination and can provide a cleaner probe of the strongly interacting medium. Recent STAR results show that in $\sqrt{s_{NN}}=3D200$ GeV central Au+Au collisions the Upsilon 1S state is suppressed more than if only cold nuclear matter effects were present, and the excited state yields are consistent with a complete suppression. The energy density in U+U $\sqrt{s_{NN}}=193$ GeV central collisions is estimated to be about 20% higher than that of $\sqrt{s_{NN}}=200$ GeV central Au+Au. Therefore U+U collisions provide a further test of the sequential suppression hypothesis. The STAR detector collected a total of 17.2 million high-tower triggered events in $\sqrt{s_{NN}}=193$ GeV U+U collisions in the year 2012, corresponding to an integrated luminosity of 263.4 $\mu b^{-1}$. Upsilon yields at mid-rapidity versus transverse momentum, as well as the nuclear modification factor with respect to the number of participants, will be reported in this presentation.

Speaker: Robert Vertesi (Nuclear Physics Institute ASCR, Prague/Rez)

Slides vertesi_StarUpsilonUU_panic-v6final.pdf

80 Results on heavy-flavour production in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC

The primary goal of ALICE at the Large Hadron Collider (LHC) is to characterise the state of matter with partonic degrees of freedom, the Quark Gluon Plasma (QGP) produced in nucleus-nucleus collisions. Heavy-quarks are considered efficient probes of the properties of the QGP since they are produced on a short time scale with respect to that of the QGP. Therefore, they are expected to traverse the strongly interacting medium and to lose energy through radiative and collisional processes. As a consequence of the interaction, the open heavy-flavour hadron spectra are modified with respect to those of proton-proton collisions at the same energy. A quantitative understanding of the nucleus-nucleus results requires reference measurements in proton-proton and proton-nucleus collisions. The study of heavy-flavour hadrons in proton-proton collisions is interesting not only as baseline for the heavy-ion collision measurement but also to provide an important test of perturbative QCD calculations. Furthermore, the study of open heavy-flavour hadron production as a function of the multiplicity of charged particles produced in the collision can give insights into multi-parton interaction phenomena. Finally, the study of open heavy-flavour hadrons in p-Pb collisions is necessary to disentangle the hot and cold nuclear matter effects in Pb-Pb collisions. In ALICE, open heavy flavours are studied through the reconstruction of D-meson hadronic decays at mid-rapidity, and via semi-electronic (at mid-rapidity) and semi-muonic (at forward rapidity) decays of charm and beauty hadrons. A review of the main results on open heavy-flavour hadron production in pp collisions at \sqrt{s} = 7 TeV and Pb-Pb collisions at \sqrt{s_NN} = 2.76 TeV will be presented. The latest results obtained in p-Pb collisions at sqrt{s_NN} = 5.02 TeV will also be discussed.

Speaker: Dr Grazia Luparello (Universita' and INFN, Trieste)

Slides GLuparello_panic2014_HF_v6.pdf

81 Relativistic heavy ion physics at JINR: status of the BM@N and MPD experiments

The comprehensive heavy-ion program launched recently at JINR (Dubna) is devoted to the study of the properties of strongly interacting matter, including a search for possible signals of deconfinement phase transition, chiral symmetry restoration and the QCD critical endpoint. The future accelerator facility NICA will supply ion species ranging from polarized proton to heavy ions with design luminosity of up to 10^27 cm^−2c^−1 for Au nuclei in the region of the collider energy up to \sqrt(s_NN) = 11 GeV. It will complement the existing accelerator Nuclotron, which is being currently upgraded in order to be able to accelerate Au nuclei up to Ekin = 4.65 A GeV (\sqrt(s_NN) = 3.5 GeV). These machines will host two heavy ion detectors: BM@N (Baryonic Matter at Nuclotron) and MPD (MultiPurpose Detector) at NICA. The research programs of these experiments will be presented along with some results of their performance studies.

Speaker: Alexander Zinchenko (Joint Institute for Nuclear Research, Dubna, Russia)

Slides AZ_PANIC.pdf AZ_PANIC.pptx

Standard model physics at the TeV scale

Convener: Dr Yvonne Peters (University of Manchester, also at Desy)

82 Search for the Higgs boson in fermionic channels using the ATLAS detector

Since the discovery of the Higgs boson by the ATLAS and CMS experiments at the LHC, the emphasis has shifted towards measurements of its properties. Of particular importance is the direct observation of the coupling of the Higgs boson to fermions. In this presentation a comprehensive review of ATLAS results in the search for the Higgs boson in tau, muon, and b-quark pairs will be given.

Speaker: Mr Michel Trottier-Mcdonald (Berkeley LBNL)

Slides panic14talk.pdf

83 Combined measurements of the properties of the Higgs boson using the ATLAS detector

A review of the combination of the coupling and spin CP properties measurements of the recently discovered Higgs boson using the ATLAS detector and up to 25 fb-1 of 7 TeV and 8 TeV pp collision data collected in 2011 and 2012 will be presented.

Speaker: Mr Peter Kluit (Nikhef)

Slides combinedHiggsATLAS.pdf

84 Search for the Higgs boson decaying to two photons in CMS

A search for Higgs bosons has been carried out in the Higgs to two photons decay channel with the CMS detector at the LHC collider. The analysis is based on pp collision data collected in 2011-2012 at centre-of-mass energies of 7 and 8 TeV corresponding to integrated luminosities of 5/fb and 20/fb, respectively. The analysis strategy and measurements of the mass, couplings, and spin-parity are reported.

Speaker: Martina Malberti (UC Riverside)

Slides malberti_Hgg_panic2014.pdf

85 Search for Higgs bosons produced in association with top quarks with the ATLAS detector

After the discovery of a Higgs boson, the direct observation of the coupling of this particle to top quarks is of particular importance. In this talk, a review of ATLAS results on the search for the Higgs boson produced in association with top quarks, and on the search for flavour-changing neutral currents in top quark decays t -> qH (q = c,u) will be presented.

Speaker: Mr Stefan Guindon (Albany)

Slides Guindon_ttHATLAS.pdf

86 Measurement of the charge asymmetry in top quark pair production in the lepton plus jet and dilepton final states

We present the measurement of the forward-backward asymmetry in top antitop quark pair production in proton antiproton collisions in the lepton plus jets and dilepton final state. Measurements use the full data set collected by D0 in Run II corresponding to an integrated luminosity of 9.7/fb. We present the most recent measurement of the lepton-based asymmetries both in lepton+jets and dilepton final states and their combination. We also present the top-quark based asymmetry as an inclusive measurement and differentially in m(ttbar). These results are corrected for efficiency, acceptance and resolution effects to parton level. Measurements are compared to theory predictions.

Speaker: Kamil Augsten (Prague, Tech. U.)

Slides KAugsten_DZero_TopChargeAsym_PANIC14.pdf

87 Recent theoretical and experimental results on top quark mass measurements

In this talk I will review recent experimental results on the measurement of top quark mass and their relation to open theoretical questions in the Standard Model and Beyond the Standard Model. I will also present some recent developments and proposals for top quark mass precision measurements that are motivated from the theory stand point for their robustness and their ease of interpretation.

Speaker: Mr Roberto Franceschini (CERN)

Slides TopOverview_-_Mass.pdf

Tests of symmetries and conservation laws

Convener: Prof. Claude Amsler

88 The First Cold Beam of Antihydrogen Atoms from a Cusp Trap

Antihydrogen is the simplest atom made entirely of antimatter, consisting of an antiproton and a positron. The study of its matter counterpart, the hydrogen atom, has produced some of the most precise determinations of physical quantities. High precise measurements of antihydrogen will allow to achieve direct tests of the fundamental symmetries of Nature through the comparison with hydrogen. The ASACUSA Collaboration has recently succeeded in producing the first beam of cold antihydrogen atoms. Antihydrogen was formed in a cusp trap by overlapping a cloud of low energy antiprotons with a positron plasma. The peculiar magnetic configuration has permitted the formation of an antihydrogen beam: 80 antiatoms were detected around 3 m downstream of the production region in a field free region where high resolution spectroscopy of the hyperfine structure of the ground state can be performed.

Speaker: Mr Luca Venturelli (Universita` di Brescia)

Slides AntihydrogenBeam_Venturelli_PANIC2014_slides_2014.pdf

89 Spectroscopy apparatus for the measurement of the hyperfine structure of antihydrogen

The ASACUSA CUSP collaboration at the Antiproton Decelerator of CERN has recently succeeded in detecting 80 antihydrogen atoms 2.7 meters away from their production trap in a magnetic field free region [1]. This successful detection constitutes a milestone toward precision spectroscopy of antimatter atoms in a beam. The goal of the ASACUSA CUSP collaboration is indeed to measure the ground- state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. The setup consists of a source of partially polarized antihydrogen atoms [2] emitted toward a radiofrequency spin-flip cavity with its resonance frequency tuned to the hyperfine transition. A superconducting sextupole magnet serves as spin analyser before the detection of the atoms in an antihydrogen detector [3]. Monte Carlo simulations show that the antihydrogen ground-state hyperfine splitting can be determined in such a beam setup at a relative precision of 0.1 ppm which, compared with the same transition in hydrogen, would provide one of the best tests of CPT symmetry. My talk will present the latest developments on the spectroscopy apparatus downstream of the antihydrogen polarizing source and the coming years program to achieve the above mentioned precision. I will also present the most recent results obtained with the atomic hydrogen beamline developed to test the performance of the spectroscopy apparatus during the CERN accelerator shutdown (LS1). [1] N. Kuroda et al., Nature Commun. 5, 3089 (2014). [2] Y. Enomoto et al., Phys. Rev. Lett. 105, 243401 (2010). [3] E. Widmann et al., Hyperfine Interactions 215, 1-8 (2013).

Speaker: Dr Chloé Malbrunot (CERN)

Slides Malbrunot_PANIC.pdf

90 Laser spectroscopy of the hyperfine splitting energy in the ground state of muonic hydrogen

We are planning to measure the ground-state hyperfine splitting energy of muonic hydrogen by laser spectroscopy techniques at the RIKEN-RAL Muon facility. The hyperfine splitting energy is about 0.182 eV, which corresponds to the laser wavelength of 6.7 μm. The experiment has become feasible by a narrow-bandwidth tunable mid-infrared laser recently developed in RIKEN [1]. The expected precision for the hyperfine splitting energy is around 2 ppm owing to the narrow bandwidth of the laser. Through the theoretical calculation with the proton structure-dependent corrections [2], the hyperfine splitting energy is directly connected to the Zemach radius (the first moment of the convolution of the proton charge and the magnetic moment distributions). This experiment is the first precise measurement of the ground-state hyperfine splitting of muonic hydrogen and can provide new insights on “Proton radius puzzle", which has been issued by a recent measurement of the Lamb shift in muonic hydrogen at Paul Scherrer Institute [3]. When the laser is irradiated onto the ground-state muonic hydrogen with the resonance frequency of the hyperfine splitting energy, the spin-flip transition is induced from the spin-singlet to the spin-triplet hyperfine sub-levels. Since the muon spin in the triplet state can be polarized by a circularly-polarized laser, we can search for the resonance frequency by detecting the spatial asymmetry of the electrons from the polarized muon decay. In this contribution, we present the physics motivation, the experimental principle and its feasibility. [1] N. Saito et al., Proc. of SPIE, vol. 8526, 852605-1 (2012). [2] A. Dupays et al., Phys. Rev. A68, 052503 (2003). [3] R. Pohl et al., Nature 466, 213 (2010).

Speaker: Dr Masaharu Sato (RIKEN)

Slides SATO.pdf

91 Experimental Study of the Parity Violating Hadronic Weak Interaction

The study of the Hadronic Weak Interaction, and particularly of the stangeness-conserving HWI between nucleons, is of interest for several reasons: Some of the phenomena observed in the strangeness-changing HWI cannot be explained in terms of the symmetries of QCD, which opens the possibility for a non-trivial QCD dynamical process that is either related to the presence of the strange quark, or is a more general process that also affects light quarks; measurement of weak amplitudes in the $\Delta S=0$ sector could discriminate between the two possibilities. The $\Delta S=0$ HWI is also perhaps the only via to study weak neutral currents at low energies, and constitutes a probe for quark-quark correlations in nucleons. At low energies, using an Effective Field Theory approach, the nucleon-nucleon HWI can be parameterized in terms of five weak transition amplitudes involving $S$ and $P$ waves. There is a program to determine these weak amplitudes through the measurement of PV observables in few-nucleon systems in experiments that make use of low-energy neutron beams at the ORNL Spallation Neutron Source (SNS) and the NIST Center for Neutron Research (NCNR). Also other type of studies, like the measurement of PV in the deuteron photo desintegration are a future possibility. I will present an overview of several experiments (NPDGamma, n-$^3$He and Neutron Spin Rotation) that are part of this program.

Speaker: Dr Libertad Barron-Palos (Instituto de Fisica, Universidad Nacional Autonoma de Mexico)

Slides PANIC2014-Libertad.pdf

92 Fundamental Physics with the ALPHA Antihydrogen Project at CERN

ALPHA is an international project at CERN, whose ultimate goal is to test symmetry between matter and antimatter at highest possible precision via comparisons of the properties of atomic hydrogen with its antimatter counter-part, antihydrogen. After several years of development, we recently achieved significant milestones, including the first stable confinement of antihydrogen [1] for as long as 1000 seconds [2]. ALPHA has also succeeded in performing the first proof-of-principle spectroscopic measurement on antihydrogen atoms by driving its hyperfine transitions with microwaves [3]. Most recently, we reported a precision measurement of charge neutrality of antihydrogen, setting a new limit of the electric charge of the positron [4]. Moreover, we have recently constructed an entirely new apparatus, ALPHA-2, which will allow laser access to the trapped anti-atoms, and provide improved magnetic field configurations for microwave spectroscopy. For the longer-term, possibilities for a measurement of antimatter-gravity interactions are being explored. This talk will discuss the recent achievements and the future prospects of fundamental physics studies with ALPHA. References : [1] G. B. Andresen et al., Nature 468, 673 (2010). [2] G.B. Andresen et al., Nature Physics 7, 558 (2011). [3] C. Amole et al., Nature (London) 483, 439 (2012). [4] C. Amole et al. Nature Communications 5, 3955 (2014).

Speaker: Mr Makoto Fujiwara (TRIUMF)

Slides Fujiwara_PANIC2014v1.pptx

19:00 Welcome Reception

Tuesday, 26 August

08:30 Registration (until 17:00)

Plenary

Convener: Dr Eckhard Elsen (DESY)

93 International Linear Collider (ILC) - as an energy frontier e+e- collider

Speaker: Prof. Akira Yamamoto

Slides PANIC14-ILC-ay-140826a.pptx

94 New accelerator projects: Rare Isotope Facilities and Electron Ion Colliders

Speaker: Dr Thomas Roser (Brookhaven National Laboratory)

Paper

• Roser_Thomas_figures.pdf
• Roser_Thomas.pdf
• Roser_Thomas.tex

Slides 2014_08_26_PANIC_2014_New_Accelerator_Projects.ppt

95 New concepts for energy frontier colliders

Speaker: Dr Jens Osterhoff (Deutsches Elektronen-Synchrotron DESY)

Slides Collider_J.Osterhoff_3.pdf

96 Announcements

Announcements Organisational-140826.pdf

10:35 Coffee Break

Plenary

Convener: Prof. Amanda Cooper-Sarkar (Oxford University)

97 Test of the standard model at low energies

Speaker: Prof. Achim Denig

Slides Panic14_Denig_pdf.pdf

98 Search for beyond standard model physics at LHC

Speaker: Prof. Kenichi Hatakeyama

Slides BSM_LHC_PANIC2014_v10.pdf

99 Dark matter and cosmology: experimental results and theory

Speaker: Dr Marco CIRELLI (IPhT CNRS/CEA Saclay)

Slides 22.DMid.PANIC14_Hamburg.pdf

12:30 Lunch Break

Beyond Standard Model

Conveners: Dirk Zerwas (LAL Orsay), Johannes Haller (University Hamburg)

100 Searches for production of two Higgs bosons using the CMS detector

Searches for events containing two Higgs bosons are presented using several decay channels of the h(126) boson. The analyses use pp collision data recorded at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 5 fb-1 and 20 fb-1, respectively. Extended Higgs sector scenarios predict the resonant decay of new particles into a pair of h(126) bosons. These resonant di- Higgs processes are searched in dierent final states and the results are described.

Speaker: Mr Souvik Das (Univ. of Florida)

Slides DiHiggs_CMS_PANIC2014_keynote.key DiHiggs_CMS_PANIC2014.pdf

vidyo link http://vidyoportal.cern.ch/flex.html?roomdirect.html&key=VrVaWkeQuKV5

101 Beyond-the-Standard Model Higgs physics using the ATLAS experiment

The discovery of a Higgs boson with a mass of about 125 GeV has prompted the question of whether or not this particle is part of a larger and more complex Higgs sector than that envisioned in the Standard Model. In this talk, the current results from the ATLAS experiment on Beyond-the-Standard Model (BSM) Higgs searches are outlined. Searches for additional Higgs bosons are presented and interpreted in well-motivated BSM Higgs frameworks, such as two-Higgs-doublet Models and the Minimal and Next to Minimal Supersymmetric Standard Model.

Speaker: Mr Gunar Ernis (Wuppertal)

Slides ATLAS-BSM-HIGGS-PANIC-2014-Ernis.pdf

102 Search for Higgs Bosons Beyond the Standard Model with the CMS Detector

After a Higgs boson with a mass near 125 GeV has been discovered, it is still unclear whether this is the Higgs boson predicted by the Standard Model (SM) or part of a different, possibly extended Higgs sector. Various models with extended Higgs sectors are being considered, such as the minimal and next-to-minimal supersymmetric extensions (MSSM and NMSSM) of the SM. Recent results of searches for additional Higgs bosons with the CMS detector are presented, which are based on pp collision data collected at centre-of-mass energies of 7 and 8 TeV corresponding to integrated luminosities of 5 fb-1 and 20 fb-1.

Speaker: Mr Matthias Schröder (DESY)

Slides panic14.pdf

103 Searches for invisible decay modes of the Higgs boson with the CMS detector

A search for Higgs boson invisible decay modes has been carried out in events where the Higgs boson is produced in association with a Z boson or through Vector Boson Fusion. In the associated production search, electron, muon, and b-quark pair decay modes of the Z boson are considered. The analyses are based on proton-proton collision data collected with the CMS detector at the LHC collider at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 5/fb and 20/fb, respectively. No evidence of a signal has been found and upper limits on the invisible branching ratio are obtained and interpreted in a Higgs portal model of dark matter interactions.

Speaker: Mr Patrick James Dunne (Imperial College London)

Slides PANIC2014.pdf

104 Constraints on new phenomena through Higgs coupling measurements with the ATLAS detector

The discovery of the Higgs boson opens many perspectives to explore physics beyond the Standard Model. This talk describes constraints of new physics in a number of models using the combined measurements of the coupling strength of the 125 GeV Higgs particle using the entire ATLAS run-I data. The various models presented include an additional real electroweak singlet, two Higgs doublet models, a simplified Minimal Supersymmetric Standard Model, and a Higgs portal to dark matter.

Speaker: Ms Camilla Maiani (Saclay CEA)

Slides HiggsCouplings_PANIC2014.pdf

Flavour physics - CKM and beyond

Convener: Dr Thomas Edward Latham (University of Warwick)

105 Recent results on the charmed hadron systems at Belle

CP violation and mixing in the charm meson system are expected to be very small in the standard model (SM), hence it can be a good probe to search for new physics beyond the SM. With large relative cross-section for charmed hadron production and clean event environment combined with high luminosity, the Belle experiment, with high statistics $e^+ e^-$ collision data taken at the KEKB energy-asymmetric collider using the Belle detector, is a very good place to study charmed hadron systems. In this presentation we report recent results from Belle on CP violation and mixing in the neutral D meson system. We also present recent results from Belle in the charmed baryon spectroscopy, including new measurements of mass, width, and absolute branching fractions of various charmed baryons.

Speaker: Mr Changwoo Joo (Seoul Nat'l univ.)

Slides joo_panic2014_09.pdf

106 Measurements of CP violation and mixing in charm decays

LHCb has collected the world's largest sample of charmed hadrons. This sample is used to search for direct and indirect CP violation in charm, and to measure D0 mixing parameters. New updated measurements from several decay modes are presented, with complementary time-dependent and time-integrated analyses.

Speaker: Mr Michael Alexander (Glasgow)

Slides MAlexander-PANIC14-CharmMixingAndCPV.pdf

107 Mass and lifetime measurements of b-flavoured hadrons

Mass and lifetime predictions of b-flavoured hadrons are an impmortant probe of QCD models. We report the world's best measurements of lifetimes of many b-flavoured mesons and baryons. We also report on observations of excited states of the B, Bs and Λb hadrons and measurements of their masses and decay widths.

Speaker: Mr Stefano Gallorini (Padova)

Slides gallorini_panic.pdf

108 CP violation in B decays at LHCb

The LHCb experiment has a great potential for precise measurements of the CP violating phase in the standard model, and for searches of new phases. We report on recent measurements of the CP violating angle angle γ which is the least constrained parameter in the CKM unitarity triangle, the phase in B mixing, and direct CP violation in B decays.

Speaker: Ms Shu-Faye Cheung (Oxford)

Slides FC_PANIC_CPV_in_B_v2.pdf

Hadrons in medium - hyperons and mesons in nuclear matter

Convener: Mrs Jia-Chii Berger-Chen (Excellence Cluster Universe, TU München)

109 High-resolution hadronic-atom x-ray spectroscopy with superconducting transition-edge-sensor microcalorimeters

High-resolution x-ray spectroscopies of hadronic atoms will be performed with an x-ray spectrometer based on an array of superconducting transition-edge-sensor (TES) microcalorimeters which have achieved remarkable development in recent years [1]. The instrument offers unprecedented full-width-at-half-maximum energy resolutions of 2 - 3 eV at 6 keV being two order of magnitude improved resolution compared with the conventional semiconductor detector, and has a large collecting area of about 20 mm^2 thanks to recent technological advances in multiplexed readout of a TES multi-pixel array. This will open new door to investigate hadron-nucleus strong interactions and provide accurate charged-hadron mass values. A hadronic atom is a Coulomb-bound system formed by a negatively charged hadron (e.g., pi^-, K^-, pbar, Sigma^-, Xi^-), electrons, and a nucleus. Effects of the strong interaction between the hadron and atomic nucleus are experimentally extracted from characteristic x-ray-emission spectroscopy of the most tightly bound energy levels that are the most perturbed by the strong force (e.g., [2-4] as the recent measurements). As for kaonic atoms, many experiments have collected data on a variety of targets [5]; however, the energy resolution of the conventional semiconductor spectrometers employed in these experiments is insufficient to see the small spectral effects due to the strong interaction. As a result, the depth of the K^- - nucleus potential at zero energy remains unknown. This is closely related to the investigation of bound states of the kaon in the nucleus being one of the hottest topics in strangeness nuclear physics now. Aiming at a breakthrough in this field, we are planning to perform ultra-high-resolution x-ray spectroscopy of kaonic atoms at J-PARC hadron beamline using arrays of TES microcalorimeters developed by NIST, which is the first application of TES to a hadronic atom experiment. Additionally, hadronic-atom x-ray spectroscopy has been used as a tool for measuring the charged hadron mass; we intend to improve the precision of the charged kaon mass measurement with TES spectrometers. In this talk we will give an overview of this project and the recent progress. [1] C. Enss (ed.), Cryogenic Particle Detection, Topics in Applied Physics, vol. 99, Springer, 2005. [2] S. Okada et al., Phys. Lett. B 653 (2007) 387-391. [3] SIDDHARTA collaboration, Phys. Lett. B 697 (2011) 199-202. [4] SIDDHARTA collaboration, Phys. Lett. B 704 (2011) 113-117. [5] C.J. Batty, E. Friedman, A. Gal, Phys. Rep. 287 (1997) 385-445.

Speaker: Dr Shinji Okada (RIKEN)

Slides 20140826_PANIC14_okada.pdf

110 Energy and density dependence of the $\bar{K}N$ and $\eta N$ amplitudes near threshold

We analyze the $\bar{K}N$ and $\eta N$ interactions using an effective separable potential coupled channels model that implements chiral symmetry [1], [2]. The energy dependence of both the $\bar{K}N$ and $\eta N$ scattering amplitudes is strongly affected by dynamically generated resonances close to the meson-baryon thresholds, the $\Lambda(1405)$ and $N^{\star}(1535)$, respectively. We discuss the relation of the observed energy dependence to the resonance pole dynamics in a free space and in nuclear medium. The model predicts an $\eta N$ stattering length $\Re a_{\eta N} \approx 0.7$ fm and in-medium subthreshold attraction most likely sufficient to generate $\eta$-nuclear bound states [3], similar to those predicted for the $\bar{K}$-nuclear interactions [4]. [1] A.~Cieply, J.~Smejkal - Nucl.~Phys.~A 881 (2012) 115 [2] A.~Cieply, J.~Smejkal - Nucl.~Phys.~A 919 (2013) 46 [3] A.~Cieply, E.~Friedman, A.~Gal, J.~Mares - Nucl.~Phys.~A 925 (2014) 126 [4] A.~Cieply, E.~Friedman, A.~Gal, D.~Gazda, J.~Mare\v{s} - Phys.~Rev.~C 84 (2011) 045206

Speaker: Dr Ales Cieply (Nuclear Physics Institute, Rez near Prague)

Slides 2014PANIC_cieply.pdf

111 Dilepton production in transport-based approaches

We investigate dilepton production at SIS and SPS energies in transport-based approaches and show that the baryon couplings of the rho meson represent the most important ingredient for understanding the measured dilepton spectra. At lower energies, the baryon resonances naturally play a larger role and affect already the vacuum spectra via Dalitz-like contributions, which can be captured well in an on-shell-transport scheme. At higher energies, the baryons mostly affect the in-medium self energy of the rho, which is harder to tackle in transport models. We employ a coarse-graining approach in order to incorporate dynamic in-medium spectral functions into a transport-evolution model and show that this yields reasonable results at both SIS and SPS energies.

Speaker: Dr Janus Weil (FIAS)

Slides talk.pdf

Neutrinos and related astrophysical implications

Convener: Prof. Janet Conrad (MIT)

112 The OPERA Experiment: Latest Results

The long-baseline neutrino oscillation experiment OPERA has been designed for the direct observation of tau neutrino appearance in the CNGS muon neutrino beam. The OPERA detector is located at the LNGS underground laboratory, with a distance of 730 km from the neutrino source at CERN. It is built of about 150000 emulsion cloud chamber modules (ECC 'bricks'), providing the micrometric resolution required for the detection of the short-lived tau leptons created in tau neutrino CC interactions. Electronic detector (ED) elements allow for online readout, interaction location, and the measurement of particle charge and momentum. CNGS beam data taking lasted from 2008 to 2012, amounting to a total of 1.8 x 10^(20) p.o.t. The neutrino oscillation analysis is ongoing, and updated results with increased statistics will be presented, including the recent 4th tau neutrino candidate event.

Speaker: Mrs Annika Hollnagel (OPERA Collaboration)

Paper hollnagel_annika.pdf

Slides OPERA_hollnagel_panic_2014.pdf

113 Precision measurement of muon neutrino disappearance by T2K

T2K is a long-baseline neutrino oscillation experiment, where a muon neutrino beam is produced at the J-PARC facility and detected by Super-Kamiokande, a water Cherenkov detector with a 22.5 kton fiducial mass, after traveling 295 km. One aim of the experiment is to precisely determine the mixing angle theta_23 and the mass squared difference Delta m^2_23 using a measurement of muon neutrino disappearance. The T2K accumulated dataset is 6.57e20 protons on target, which is 8% of the experimental goal. In this talk, we will present an analysis of the T2K muon neutrino disappearance data and the world’s best constraint on the value of the mixing angle theta_23 obtained by this analysis. Future prospects, including running with antineutrino-mode beam and continued analysis improvements, will also be shown.

Speaker: Mr Erez Reinherz-Aronis (Colorado State University)

Slides PrecisionMeasurementOfMuonNeutrinoDisappearanceByT2K-ERA.pdf

114 Initial probe of delta_CP by T2K with muon neutrino disappearance and electron neutrino appearance

T2K is a long-baseline neutrino oscillation experiment in which a muon neutrino beam is produced at the J-PARC facility and detected by Super-Kamiokande, a water Cherenkov detector with a 22.5 kton fiducial mass, after traveling 295 km. Since 2010, T2K has accumulated 6.57e20 protons on target, which is 8% of the experimental goal. T2K has observed 120 numu event candidates, which show a clear disappearance oscillation pattern, and 28 nue event candidates, with which nue appearance was established. The measurement of nue appearance is partic- ularly important because it enables us to determine the delta_CP phase when theta_23 and theta_13 are known. Using the values of theta_23 determined by the T2K disappearance measurement and theta_13 measured by reactor nuebar disappearance measurements, T2K has obtained the first constraint on the delta_CP phase from a nue appearance measurement. In addition to this result, future prospects, including running with antineutrino-mode beam and continued analysis improvements, will also be shown.

Speaker: Ms Helen O'Keeffe (Lancaster University)

Slides okeeffe_panic_final.pdf

115 Recent results from the T2K ND280 Detector

The T2K near detector complex, ND280, is located at the J-PARC accelerator facility in Tokai, Japan, 280 meters downstream from the target. This talk will summarize recent physics results from ND280.

Speaker: Mr Jonathan Perkin (University of Sheffield)

Slides panicPerkin

116 IsoDAR and DAEdALUS

IsoDAR is an innovative experimental concept to use a high power, low energy cyclotron to produce a source of electron antineutrinos. Such an intense source, when combined with a liquid scintillator based detector, can provide a direct probe of the reactor antineutrino anomaly and, in general, a definitive test of the sterile neutrino. Further, IsoDAR can distinguish between one and two sterile neutrinos in many cases as well as collect a large sample of antineutrino-electron elastic scattering events. The experiment will be introduced within the context of the DAE$\delta$ALUS program for measuring CP violation in the neutrino sector and recent progress will be discussed.

Speaker: Prof. Janet Conrad (MIT)

Slides Conrad_for_Spitz_PANIC_2014.pdf

New concepts and techniques for accelerators and particle detectors

Convener: Dr Frank Simon (Max-Planck-Institute for Physics)

117 Upgrading the ATLAS Tile Calorimeter electronics

The Tile Calorimeter (TileCal) is the central hadronic calorimeter of the ATLAS experiment at LHC. Around 2023, after the upgrade of the LHC (High Luminosity LHC, phase 2) the peak luminosity will increase by a factor of 5 compared to the design value (10^34 cm^-2 s^-1), thus requiring an upgrade of the TileCal readout electronics. Except the 9852 photomultipliers (PMTs), most of the on- and off-detector electronics will be replaced, with the aim of digitizing all PMT pulses at 40 MHz at the front-end level and sending them with 10 Gbps optical links to the back-end electronics. Moreover, to increase reliability, redundancy will be introduced at different levels. Three different options are currently being investigated for the front-end electronics and extensive test beam studies are planned to select the best option. One demonstrator prototype module is also planned to be inserted in TileCal in 2014 that will include hybrid electronic components able to probe the new design, but still compatible with the present readout architecture.

Speaker: Mr Gabriel Popeneciu (INCDTIM)

Slides Slides-PANIC_2014_-_G_Popeneciu(3).pdf

118 The LHCb trigger and its upgrade

The LHCb experiment is a spectrometer dedicated to the study of heavy flavour at the LHC. The current LHCb trigger system consists of a hardware level, which reduces the LHC inelastic collision rate of 13MHz to 1 MHz, at which the entire detector is read out. In a second level, implemented in a farm of 20k parallel-processing CPUs, the event rate is reduced to about 5 kHz. We review the performance of the LHCb trigger system, focusing on the High Level Trigger, during Run I of the LHC. The High Level Trigger showcased a number of pioneering concepts, for example : the deployment of an inclusive multivariate B-hadron tagger as the main physics trigger of the experiment, buffering of events to local disks in order to leverage the otherwise idle resources when the LHC does not produce collisions, and simulation-free event-by-event trigger efficiency corrections. The LHCb experiment plans a major upgrade of the detector and DAQ system in the LHC shutdown of 2018. In this upgrade, a purely software based trigger system is being developed, which will have to process the full 30 MHz of inelastic collisions delivered by the LHC. We demonstrate that the planned architecture will be able to meet this challenge, particularly in the context of running stability and long term reproducibility of the trigger decisions. This talk will cover the design and performance of the LHCb trigger system in Run I as well as the planned improvements in the upgrade of the LHCb experiment.

Speaker: Mr Christian Linn

Slides linn_lhcbtrigger_v4.pdf

119 The STAR Heavy Flavor Tracker (HFT)

The heavy quark hadrons are suggested as a clean probe for studying the early dynamic evolution of the dense and hot medium created in high-energy nuclear collisions. The Heavy Flavor Tracker (HFT) of the STAR experiment, designed to improve the vertex resolution and extend the measurement capabilities in the heavy flavor domain, was installed for the 2014 heavy ion run of RHIC. It is composed of three different silicon detectors arranged in four concentric cylinders close to the STAR interaction point. The two innermost layers are based on CMOS monolithic active pixels (MAPS), featured for the first time in a collider experiment, and the two outer layers are based on pads and strips. The two innermost HFT layers are placed at a radius of 2.7 and 8 cm from the beam line and accommodate 400 ultra-thin (50 um) high resolution MAPS sensors arranged in 10-sensor ladders to cover a total silicon area of 0.16 m2. Each sensor includes a pixel array of 928 rows and 960 columns with a 20.7 μm pixel pitch, providing a sensitive area of ~ 3.8 cm2. The sensor features 185.6 μs readout time and 170 mW/cm2 power dissipation, allowing it to be air cooled, which results in a global material budget of only 0.5% radiation length per layer. A novel mechanical approach to detector insertion enables effective installation and integration of the pixel layers within an 8 hour shift during the on-going STAR Run. After a detailed description of the design specifications and the technology implementation, the detector status and operations during the current 200 GeV Au+Au run will be presented in this talk. A preliminary estimation of the detector performance meeting the design requirements will be reported.

Speaker: Mr Joachim Schambach (University of Texas, Austin)

Slides PANIC2014_Schambach.pdf

120 Study of Solder Ball Bump Bonded Hybrid Silicon Pixel Detectors

For the connection of front-end read-out chips to a silicon sensor of a hybrid pixel detector an in-house flip-chip bump bonding process using precision tin-silver solder balls has been developed at DESY. The electrical testing of the bump connections follows immediately using an automated probe station by sensing a capacitively induced charge. The bump bonding quality and results from thermal stress testing will be reported. The pixel detector modules have been evaluated in the DESY electron test beam in terms of noise, cross talk, efficiency and position resolution which will be summarized.

Speaker: Dr Somnath CHOUDHURY (DESY)

Slides PANIC-2014-Pixel-Talk.pdf

Nuclear and particle astrophysics

Convener: Prof. Dieter Horns (Univ. Hamburg)

121 The highest energy particles: Measurements from the Pierre Auger Observatory

The Pierre Auger Observatory is the world's largest cosmic ray observatory.  The observatory combines two complementary detection techniques to study the extensive particle showers created by collisions of primary cosmic rays with the atmosphere.  Analysis of those showers enables one not only to estimate the energy, direction and most probable mass of the primary cosmic particles, but also to obtain information about the properties of their hadronic interactions at an energy more than one order of magnitude above that accessible with the current highest energy human-made accelerator. In this contribution we will discuss the cosmic ray energy spectrum, searches for directional anisotropy, studies of mass composition, the determination of the number of shower muons (which is sensitive to the shower hadronic interactions), and limits on the fluxes of primary photons and neutrinos.

Speaker: Dr João de Mello Neto (Federal University of Rio de Janeiro)

Slides PANIC2014_Auger.pdf

122 Magnetic Horizons of Ultra-High Energy Cosmic Rays

The origin, composition and mechanisms of acceleration the Ultra-High Energy Cosmic Rays (UHECRs) are not yet fully understood. The trajectories of these particles can be affected by cosmic magnetic fields. Depending on the strength and properties of these fields, charged cosmic rays can diffuse and have propagation times comparable to the age of the universe, causing a suppression in the measured flux of particles. In this work we use magnetic field distributions from cosmological simulations to study the effects of this suppression on the UHECR spectrum and mass composition.

Speaker: Mr Rafael Alves Batista (II. Institute for Theoretical Physics, University of Hamburg)

Slides rab-magnetic_horizons.pdf

123 Results and prospects on registration of reflected Cherenkov light of EAS from cosmic particles above 10^15eV.

Despite the efforts of numerous experiments with different components of extensive air showers (EAS) in the last decades, the uncertainty in the all nuclei spectrum of primary cosmic rays is still high and the results on chemical composition of primary cosmic rays from different experiments contradict each other. In this study an overview of the SPHERE experiment based on detection of the Vavilov-Cherenkov radiation from EAS reflected from the snow surface and of various experiments based on the same method in the same energy region E>10^15 eV is given. In particular, experimental results, methods of analysis of collected data along with subsequent methods of spectrum and mass composition reconstruction, their advantages and weak points are discussed. The first results on the energy spectrum and mass composition reconstruction of the SPHERE experiment are given and discussed and the main sources of systematic uncertainties that can affect these results are evaluated. Finally prospects of the SPHERE experiment and this technique are given.

Speaker: Dr T.A. Dzhatdoev (Lomonosov Moscow State University, Russia)

Slides SPHERE-PANIC-2014.pdf

124 Nuclear pairing from microscopic forces: singlet channels and higher-partial waves

Background: An accurate description of nuclear pairing gaps is extremely important for understanding static and dynamic properties of the inner crusts of neutron stars and to explain their cooling process. Purpose: We plan to study the behaviour of the pairing gaps as a function of the Fermi momentum for neutron and nuclear matter in all relevant angular momentum channels where superfluidity is believed to naturally emerge. The calculations will employ realistic chiral nucleon-nucleon potentials with the inclusion of three-body forces and self-energy effects. Method: The superfluid states of neutron and nuclear matter are studied by solving the BCS gap equation for chiral nuclear potentials using the method suggested by Khodel, where the original gap equation is replaced by a coupled set of equations for the dimensionless gap function and a non-linear algebraic equation for the gap magnitude at the Fermi surface. Results: We have successfully applied Khodel's method to singlet (S) and coupled channel (SD and PF) cases in neutron and nuclear matter. Our calculations nicely agree with other ab-initio approaches, where available, and provide crucial inputs for applications in superfluid systems, i.e. the cooling process of Cassiopeia A.

Speaker: Dr Paolo Finelli (Department of Physics, University of Bologna)

Slides PANIC_FINELLI2.pdf

125 Investigation of the rotation effects on high density matter in hybrid stars

The equation of state (EOS) for the high density matter is still not clear and recent several observations indicate the restrictions of the EOSs, therefore theoretical studies should try to elucidate the EOSs in the high density and/or temperature. As there are many rapidly rotating neutron stars (pulsars), many theoretical studies try to take into account the effect of rotation[1]. We accordingly also try to take into account the effects of rotation in our study[2]. Then we find that our EOS is consistent with these observations[3]. We also see an important relation between radius and rotation. Ordinarily, the “radius” of the star is single-valued because we consider that the star is spherical. However, if the star is rapidly rotating, we have to pay attention to the different “radii”. Because of the effect of the rotation, a star deforms from a sphere to an ellipse. Therefore, we introduce two values, R_eq and R_p, which are the “equatorial radius” and the “polar radius”, respectively. If the rotation rate is 400 Hz or faster, the two radii are different. Therefore, we have to note the effects of rotation on rapidly rotating stars. References: [1] A. Kurkela et al., arXiv:1006.4062[astro-ph.HE]. [2] T. Endo, Phys. Rev. C 83, 068801 (2011). [3] T. Endo, arXiv:1310.0913[astro-ph.HE].

Speaker: Prof. Tomoki Endo (Kagawa National College of Technology)

Slides PANIC2014_endo.ppt

Quarks and gluons in hadrons, the hadron spectrum

Convener: Prof. Nicole D'Hose (CEA Saclay)

126 New JLab/Hall A Deeply Virtual Compton Scattering results

The normalization studies performed for the DVCS 2010 experiment in Jefferson Lab Hall A lead to a re-analysis of the published 2004 results. In addition to the updated results for the published kinematics, we will also show new data points for the unpolarized DVCS cross section at $Q^2$=1.9 GeV$^2$ and $x_B$=0.36. Moreover, using the same data set, we analyzed the $x_B$-dependence of the helicity-dependent and independent cross sections at fixed $Q^2$=2.1 GeV$^2$. Finally, some preliminary results for the 2010 experiment will be shown as well.

Speaker: Mr Maxime DEFURNE (CEA)

127 Hard exclusive electroproduction of photons and mesons at HERMES

Hard exclusive leptoproduction of real photons (deeply virtual Compton scattering, DVCS) or mesons on nucleons is widely considered to be one of the most promising reactions that can provide information about the structure of the nucleon in the framework of generalized parton distributions (GPDs). During last years, DVCS has been extensively studied at the HERMES experiment through measurements of various cross-section asymmetries. HERMES has collected a wealth of data on scattering a 27.5 GeV longitudinally polarized electron/positron beam off unpolarized, longitudinally and transversely polarized hydrogen targets, as well as off unpolarized and longitudinally polarized deuterium targets. The collected data allow the measurement of a complete set of asymmetries with respect to beam charge, beam helicity and target polarization alone and also with respect to their different combinations. These asymmetries are sensitive to real and/or imaginary parts of different combinations of Compton form factors and can be used to constrain different GPDs. From measurements of exclusive meson production on hydrogen and deuterium targets complementary information about GPDs can be obtained. The study of the azimuthal distribution of the decay products via spin density matrix elements provides constraints on helicity amplitudes used to describe exclusive meson production. Recent results on the exclusive reactions from HERMES are presented.

Speaker: Dr Sergey Yashchenko (DESY)

Slides YashchenkoPANIC14.pdf

128 The GPD physics program at COMPASS: present results and future perspectives

An important component of the physics program at COMPASS (Common Muon Proton Apparatus for Structure and Spectroscopy) is the study of the nucleon structure through generalized parton distributions (GPDs). The GPDs correlate the momentum distributions of the quarks inside the nucleon with a transverse spatial distribution, hence providing a three dimensional imaging of the nucleon. Experimentally, those can be accessed by exclusive processes such as deeply virtual Compton scattering (DVCS), or hard exclusive meson production (HEMP). The study of the hard exclusive processes such as DVCS thanks to muon-proton scattering at COMPASS will provide unique information for the parameterization of the nucleon structure in terms of GPDs. In COMPASS II will be equipped with a 2.5 m liquid hydrogen target, on which will be sent a 160 GeV muon beam with high intensity and high polarization. The resulting kinematic range covered spans from 0.01 < xBj < 0.15 with a Q2 up to 10 GeV2, which yet remains unexplored. In addition to the usual COMPASS setup, a Time-Of-Flight recoil detector is installed to identify the recoiling proton and ensure exclusivity, as well as a new electromagnetic calorimeter to enlarge the photon angular acceptance. The most unique feature of COMPASS is the possibility to receive both mu+ and mu- beams. Measuring the cross section for both beam charge and spin states will grant important additional insight for the extraction of the GPD H. So far, a pilot run of one week with lower luminosity and a prototype recoil detector proved the capability of the COMPASS spectrometer to measure exclusive photon leptoproduction o the proton. The results of this test run will be presented. Later on, a test run of four weeks at nominal luminosity and with the complete proton detector has been recorded, and its analysis is underway. Preliminary results of this run will be presented. Besides DVCS, COMPASS is also capable to measure HEMP, which are particularly interesting for flavour separation in the GPDs extraction. The experiment already provided us with such data, namely mu p -> mu p rho0, which have been analyzed and successfully interpreted in the GPD framework developed by S. Goloskokov and P. Kroll. Those exclusive rho0 results will also be discussed.

Speaker: Dr Eric Fuchey (CEA Saclay)

Slides EFuchey_PANIC2014.pdf

129 DEEPLY VIRTUAL MESON PRODUCTION AT JEFFERSON LAB

A longstanding goal in nuclear and particle physics has been to describe the three dimensional structure of the nucleon in terms of the quarks and gluon fields. In this regard, exclusive electron scattering experiments, in which all final state particles are measured, are important contributors. Examples are electron elastic scattering, deeply virtual Compton scattering (DVCS), and deeply virtual meson electroproduction (DVMP). The latter includes pseudoscalar mesons with intrinsic spin and parity JP=0-, such as π-, π0, π+ and η, and vector mesons, which have the same spin and parity as the photon, JP=1-, such as ρ-, ρ0, ρ+, ω and φ. Exclusive electron scattering reactions at high momentum transfers directly related to Generalized Parton Distributions (GPDs) of quarks and gluons. Most reactions studied, such as DVCS or vector meson electroproduction, are primarily sensitive to the chiral-even GPDs. Very little is known about the chiral-odd GPDs, except that HT becomes the transversity function h1 in the forward limit. The chiral-odd GPDs are difficult to access since hard subprocesses with the quark spin-flip are suppressed. It turns out that pseudoscalar meson electroproduction, and especially π0 and η production, were identified as especially sensitive to the parton helicity-flip subprocesses. Dedicated experiments to study Deeply Virtual Meson Production have been carried out in Hall B at Jefferson Lab. The cross sections and asymmetries of the exclusive pseudoscalar meson electroproduction processes in a very wide kinematic range of Q2, xB and t have been measured with CLAS. The comparison of these data with the theoretical models will help us to better understand the connection of these processes with the longitudinal and transverse GPDs. We view the work presented in this report as leading into the program of the Jefferson Lab 12 GeV upgrade. The increased energy and luminosity will allow us to study these processes at much higher Q2 and xB and perform Rosenbluth L/T separations of the cross sections.

Speaker: Prof. Michel Guidal (Orsay)

Slides CLAS_PANIC14.pptx

130 Future precision studies of the DVCS process at JLab

Generalized Parton Distribution (GPDs) functions describe the correlation between the spatial distribution of the quarks and its longitudinal momentum fraction. Their definition in the mid 1990’s has revolutionized our approach to the description of the internal structure of the nucleon. Deeply Virtual Compton Scattering (DVCS) off the nucleon (γ ∗ N → γ N ) is the simplest process which is sensitive to the GPDs. A suite of approved DVCS experiments is currently in preparation in Hall A and Hall C at Jefferson Lab. These experiments are the third phase of a successful approach to precise (~5%) measurement of absolute cross-section. The first generation of experiments [1, 2] showed the importance of precise measurement of absolute cross-section. The second generation of experiments (data under analysis) will provide a complete separation of all terms making up the total cross-section. And the third generation of experiments (data to be taken with the 12 GeV beam at JLab) will provide measurements over an extended kinematic range. In this talk, I will review the upcoming DVCS precision measurement program. References [1] C. M. Camacho et al. [Jefferson Lab Hall A and Hall A DVCS Collaborations], Phys. Rev. Lett. 97, 262002 (2006) [nucl-ex/0607029]. [2] M. Mazouz et al. [Jefferson Lab Hall A Collaboration], Phys. Rev. Lett. 99, 242501 (2007) [arXiv:0709.0450 [nucl-ex]].

Speaker: Dr Julie Roche (Ohio University)

131 Timelike Compton scattering off the nucleon

We present our studies of the Timelike Compton Scattering (TCS) process off the nucleon (gamma N -> N gamma* -> e+e-). At sufficiently large virtuality of the nal state photon, this reaction provides access, via a QCD factorization theorem, to the Generalized Partons Distributions (GPDs) of the nucleon. GPDs contain, in particular, informations about the correlations between the longitudinal momentum and the transverse spatial distributions of the partons inside the nucleon, which are curently largely unknown. Using several modellings of GPDs, we have calculated all single and double beam and target polarization observables, for proton and neutron targets. This is of particular interest in view of the coming 12 GeV JLab upgrade where a complete experimental TCS program can be envisaged, in complement of the currently approved DVCS (Deep Virtual Compton Scattering: eN to eNgamma ) program aiming at extracting GPDs.

Speaker: Mrs Marie Boer (Institut de Physique Nucleaire d'Orsay)

Slides PANIC_mboer.pdf

Quarks and gluons in hot and dense matter

Convener: Ralf Ulrich (Karlsruhe Institute of Technology)

132 Saturation effects in forward-forward dijet production in p+Pb collisions

We study saturation effects in the production of forward dijets in proton-lead collisions at the LHC, using the framework of High Energy Factorization. Such congurations, with both jets produced in the forward direction, probe the gluon density of the lead nucleus at small longitudinal momentum fraction, and also limit the phase space for emissions of additional jets. We find a signicant suppression of the forward dijet azimuthal correlations in proton-lead versus proton-proton collisions, which we attribute to stronger saturation of the gluon density in the nucleus wavefunction compared to the proton. In order to minimize the model dependence of our predictions, we use two dierent extensions of the Balitsky-Kovchegov equation with sub-leading corrections.

Speaker: Dr Cyrille Marquet (Ecole Polytechnique and CNRS)

Slides hamburg14.pdf hamburg14.ppt

133 On parton number fluctuations at various stages of the rapidity evolution

Starting with the interpretation of parton evolution with rapidity as a branching-diffusion process, we describe the different kinds of fluctuations of the density of partons which affect the properties of QCD scattering amplitudes at moderately high energies. We then derive some of these properties as direct consequences of the stochastic picture. We get new results on the expression of the saturation scale of a large nucleus, and a modified geometric scaling valid at intermediate rapidities for dipole-dipole scattering.

Speaker: Dr Stephane Munier (CPHT, Ecole polytechnique, CNRS)

Slides munier_v4.pdf

134 Measuring the gluon distribution in nuclei at an Electron-Ion Collider

Despite the successes of the HERA collider, where much information was gained on the structure of the nucleon, data on the structure of the nucleus at moderate-to-small \x remains elusive, as only fixed-target high-\x data currently exist. The small-\x region, however, is of great interest. The nucleon structure in this region is dominated by gluons which show a rapid rise with decreasing \x. At low-\x, this growth must be tamed and the gluon distribution will be saturated. This saturation phenomena is expected to be universal, appearing in both nucleons and nuclei. A knowledge of this regime is of vital importance to understanding the underlying physics which governs the initial conditions of heavy-ion collisions at both the LHC and RHIC, where particle production is dominated by gluons from this unknown region. However, only tantalising hints of this have been observed so far. Therefore, the construction of an Electron-Ion Collider (EIC), colliding polarised electrons with polarised protons and also a wide variety of nuclei, will allow an exploration of the region of small-\x in great detail (with luminosities 100x that of HERA), answering questions on both the spatial and momentum distributions of gluons and sea quarks in nuclei. In particular, the saturation region is more accessible in nuclei due to the amplification of the saturation scale with nuclear size ($Q_S$ $\propto$ A$^{1/3}$). In this paper I present the current status of measuring the gluon distribution in nuclei in $e$+A collisions at an EIC.

Speaker: Dr Matthew Lamont (Brookhaven National Lab)

Slides PANIC2014_Lamont_Final.pdf

Standard model physics at the TeV scale

Convener: judith katzy (desy)

135 Top quark pair production cross section at LHC in ATLAS

Measurements of the top quark production cross sections in proton-proton collisions with the ATLAS detector at the Large Hadron Collider are presented. The measurement require no, one or two electrons or muons in the final state (single lepton, dilepton, hadronic channel). In addition, the decay modes with tau leptons are tested (channels with tau leptons). The main focus are measurements of differential spectra of ttbar final states, in particular, measurements that are able to constrain the modelling of additional parton radiation like the jet multiplicity distribution.

Speaker: Spyridon Argyropoulos (DESY)

Slides topPANIC.pdf

136 Top quark physics results from CMS

Recent results on top quark properties and interactions are presented, obtained using data collected with the CMS experiment during the years 2011 and 2012 at 7 TeV and 8 TeV center-of-mass energy. Measurements are performed for the inclusive and differential top quark pair production cross sections in several top quark final states. The mass of the top quark is extracted using several methods, including indirect constraints from the measured cross section. Cross sections for the electroweak production of single top quarks in both t- and tW-channels are also measured, and limits are set on s-channel production. Further results include measurements of top quark properties, such as the W helicity in top decays, the top pair charge asymmetry, the top quark charge as well as the search for anomalous couplings in both pair and single top-quark production. The results are compared with predictions from the standard model.

Speaker: Dr Jeremy Andrea (Institut Pluridisciplinaire Hubert Curien)

Slides top_CMS_PANIC2014_final.pdf top_CMS_PANIC2014_final.ppt

137 Tau_jet resummation in Higgs production at NNLL + NLO

Jet vetoes play a crucial role in the precise measurement of the Higgs properties at the LHC. The vetoes on additional jets introduce sensitivity to soft and collinear radiation and induce logarithms of the jet-veto variable that need to be resummed. In this talk, we consider Higgs production via gluon fusion with a veto on jet beam thrust, Tau_jet, which is a jet-based variable that can be used as an alternative to pT_jet in current experiments. Tau_jet denotes the maximum of the plus momenta (with respect to beam direction) assigned to identified jets with radius R. This is in contrast to considering the maximum pT of a jet. We present the resummed 0-jet Higgs production cross section for Tau_jet at next-to-next-to leading logarithmic (NNLL) accuracy, incorporating the NLO fixed order result. For small R, typically used in current experiments, the clustering logarithms arising from the correlated emissions within the beam and soft functions become important at NNLL. We compute the leading jet clustering corrections to the soft function anomalous dimension at O(alpha^2) and incorporate them in our resummed results.

Speaker: Ms Shireen Gangal (DESY)

Slides Taujet_PANIC_SG.pdf

138 Inclusive deep-inelastic scattering at HERA

Recent results on deep-inelastic scattering at HERA are presented. The H1 and ZEUS experiments each have determined new measurements of the proton longitudinal structure function FL, making use of the HERA data recorded at reduced centre-of-mass energies. The results are in agreement with each other and with predictions derived from QCD fits. The region of high x is explored in a dedicated measurement by the ZEUS collaboration. All HERA inclusive data published up to now by H1 and ZEUS are combined, taking into account the experimental correlations between measurements. As a result, a combined dataset is obtained. It includes measurements of neutral current and charged current cross sections recorded at different centre-of-mass energies, spanning up to six orders of magnitude both in momentum transfer $Q^2$ and in Bjorken-x. The dataset is superior in precision compared to the previous HERA data combination which included a smaller fraction of the total integrated luminosity collected at HERA. Point-to-point uncorrelated uncertainties better than 1% are observed in certain kinematic regions.

Speaker: Mr Zhiqing Zhang (LAL Orsay)

Slides Zhang_panic14.pdf

139 HERAPDF fits of the proton parton densities

New combined H1 and ZEUS data on neutral and charged current inclusive cross sections at HERA from all running periods 1994-2007, are used as the sole input to NLO and NNLO QCD analyses to determine new sets of parton distributions, HERAPDF2.0, with small experimental uncertainties and an estimate of model and parametrisation uncertainties. A HERAPDF fit, evolved in leading order (LO) in alpha_s using the DGLAP evolution equations, is also presented. The LO PDF is particularly useful for Monte Carlo event generators based on LO matrix elements plus parton showers.

Speaker: Mrs Amanda Cooper-Sarka (Oxford)

Slides panic_amcs_2014.pdf

140 On a four dimensional formulation for dimensionally regulated amplitudes

We propose a pure four-dimensional formulation (FDF) of the d-dimensional regularization of one-loop scattering amplitudes. In our formulation particles propagating inside the loop are rep- resented by massive internal states regulating the divergences. The latter obey Feynman rules containing multiplicative selection rules which automatically account for the effects of the extra- dimensional regulating terms of the amplitude. The equivalence between the FDF and the Four Dimensional Helicity scheme is discussed. We present explicit representations of the polarization and helicity states of the four-dimensional particles propagating in the loop. They allow for a complete, four-dimensional, unitarity-based construction of d-dimensional amplitudes. Generalized unitarity within the FDF does not require any higher-dimensional extension of the Clifford and the spinor algebra. Finally we show how the FDF allows for the recursive construction of d-dimensional one-loop integrands, generalizing the four-dimensional open-loop approach.

Speaker: Angelo Raffaele Fazio (UNAL)

Slides Blois165.pdf

16:00 Poster Session with Coffee Break

Wednesday, 27 August

08:30 Registration (until 14:00)

Plenary

Convener: kerstin Hoepfner (RWTH Aachen)

141 Electroweak precision physics at the LHC

Speaker: Dr Pushpalatha Bhat

Slides PBhat_EWK_PANIC2014.pdf

142 Heavy flavor physics, b-physics

Speaker: Dr Thomas Edward Latham (University of Warwick)

Slides tlatham-panic-2014.pdf

143 Quarkonia results, resonances, spectroscopy

Speaker: Prof. Gagan Mohanty

Slides PANIC-2014.pdf PANIC-2014.pptx

144 Organisational information

Speaker: Mr Matthias Kasemann (DESY/CMS)

Slides Organisational-140827.pdf

10:35 Coffee Break

Plenary

Convener: Prof. Dieter Horns (Univ. Hamburg)

145 Hadronic interaction models, cosmic rays vs LHC

Speaker: Ralf Ulrich (Karlsruhe Institute of Technology)

Slides RalfUlrich.pdf

146 Gamma ray astronomy

Speaker: Prof. Werner Hofmann

Slides Panic_2014_08_Hofmann.pptx

147 High energy neutrino physics

Speaker: Prof. Kara Hoffman (University of Maryland)

Slides PANIC_Hoffman_2014_final_hh.pptx

12:30 Lunch Break

Airbus tour

Alternative City/Harbour Tour

City Tour

Container terminal tour

Harbour Tour

Alster Lake and Canals Tour

Miniatur Wunderland

model railway

http://www.miniatur-wunderland.de/

meeting point next to the registration desk

19:00 Cultural Event

148 Public Talk

Speaker: Prof. Albrecht Wagner

Slides PANIC2014_Teilchenphysik_in_HH_AW_print.pdf PANIC2014_Teilchenphysik_in_HH_AW_print.pptx

Thursday, 28 August

08:30 Registration (until 14:00)

Plenary

Convener: Prof. Roger Jones (Univ. of Manchester)

149 Neutrino physics at the intensity frontier

Speaker: Prof. Janet Conrad

Slides nufrontier_conrad_final.pdf

150 Nuclear astrophysics

Speaker: Prof. Hendrik Schatz

Movie

• heger_burst2.mov
• linux43_nice_inverse_rproc.mov
• linux43_nice_part_todrip.mov
• linux43_nice_part_tofusion.mov
• rwind_90_lepp.mov
• xrb.avi

Slides panic2014.pptx

151 Neutrino properties

Speaker: Prof. Stephen Parke

Slides parke_panic.pdf

152 Organisational information

Slides Organisational-140828.pdf

10:35 Coffee Break

Plenary

Convener: Dr Markus Diehl (DESY)

153 Neutrinos in nuclear physics

Speaker: Robert D. McKeown (Jefferson Laboratory)

Slides PANIC14_v2.pptx

154 Hadron and proton structure, spin, charge and QED expansion

Speaker: Prof. Nicole D'Hose

Slides NdH_PANIC2014_8.pdf

155 Lattice QCD

Speaker: Prof. Constantia Alexandrou

Slides PANIC_2014_v2.pdf

12:30 Lunch Break

Beyond Standard Model

Conveners: Dirk Zerwas (LAL Orsay), Johannes Haller (University Hamburg)

156 Search for heavy resonances in two-particle final states with leptons, jets and photons at CMS

At the LHC, the production of heavy resonances decaying into a pair of particles can be probed at unprecedented centre-of-mass energies. Two-particle resonances are predicted in a variety of BSM models and can be searched for in a largely model-independent fashion. Results from searches for resonances in final states with leptons, jets and photons based on the full dataset of 20 fb-1 taken by the CMS detector in 2012 in proton-proton collisions at a centre-of-mass energy of 8 TeV are presented. They are interpreted in terms of various theories of BSM physics ranging from generic heavy resonances such as the Z' to excited quarks or Randall-Sundrum gravitons. In absence of a signicant deviation from the expected SM background 95% CL limits are set on model parameters of the theories under study. The talk will put special emphasis on the most recent results.

Speaker: Mr Andreas Guth (RWTH Aachen)

Slides slides_guth_panic14.pdf

157 Searches for heavy resonances and anomalous production of multi-leptons with the ATLAS detector

Events containing several leptons are useful probes of new phenomena due to the low background from Standard Model processes. We look for anomalous production of prompt like-sign leptons or events with three or more leptons, as well as search for excited leptons, heavy leptons and heavy neutrinos. The searches use the data recorded in 2012 at sqrt(s)=8 TeV centre-of-mass energy by the ATLAS experiment at the LHC.

Speaker: Mr Rozmin Daya (Massachusetts)

Slides RDaya.PANIC2014_3.pdf

158 Searches for vector-like quarks, tt and tb resonances with the ATLAS detector (joint with the TOP group)

Various extensions of the Standard Model predict the existence of new types of quarks. We report on several search channels such as vector-like quarks decaying to a Higgs boson and a top quark or to a W boson and a b quark. The talk presents results from searches for new resonances decaying to a top-antitop pair and a top-antibottom pair, including the use of boosted top quark reconstruction techniques. These searches use the data sample recorded in 2012 at sqrt(s)=8 TeV centre-of-mass energy by the ATLAS experiment at the LHC.

Speaker: Mr David Calvet (Clermont-Ferrand)

Slides PANIC2014-slides.pdf

159 Searches for electroweak production of supersymmetry, supersymmetry in resonance production, R-parity violating signatures and events with long-lived particles with the ATLAS detector

This talk presents the latest ATLAS results in the context of electroweak production of SUSY particle, R-Parity violating SUSY scenarios, and scenarios with long-lived SUSY particles. The results presented use the full 20/fb of sqrt(s) = 8 TeV p-p collisions collected by the ATLAS experiment in 2012. The prompt searches consider final states including leptons, jets (including b-jets) and missing energy, whereas the dedicated searches for long lived SUSY particles utilize abnormal specific energy loss, appearing or disappearing tracks, displaced vertices, long time-of-flight or late calorimetric energy deposits. Prospects at HL-LHC will also be discussed as an outlook.

Speaker: Mr Maximilian Goblirsch-Kolb (Munich MPI)

Slides 2014-08-28_ATLAS_EW_RPVLL_goblirsch.pdf

Flavour physics - CKM and beyond

Convener: Prof. Gagan Mohanty

160 New Physics Searches with b-hadrons at the ATLAS experiment

Flavour changing neutral currents and precision measurements of CP violation are investigated in ATLAS as probes to new physics beyond the standard model. This talk presents the most recent results on the search for the rare decay Bs (B0) -> mu+mu-, as well as providing the latest update on the study of the different angular amplitudes contributing to flavour tagged Bs -> J/psi phi (mu+mu-K+K-) decays. The latter analysis measures the CP-violating phase phi_s, as well as the average B_s meson lifetime Gamma_s and the decay width difference DeltaGamma_s.

Speaker: Ms Lidia Smirnova (Moscow SU)

Slides Smirnova_PANIC2014.pdf

161 Study of B meson systems and searches for new physics at Belle

B meson decays provide various tests in the quark flavor structure of the standard model (SM) of particle physics, e.g. in the CP violation and the CKM quark-mixing structure. With high statistics $B\bar{B}$ event sample collected at the KEKB $e^+ e^-$ energy-asymmetic collider using the Belle detector, Belle has obtained numerous results in the B meson system. In this presentation, we report recent results from Belle on the B meson systems, e.g. CP violations, CKM-related measurements in leptonic and semileptonic decays, and rare or exotic decays, and their interpretations in regard to searches for new physics beyond the SM. The results are based on the full Belle data sample of 711/fb obtained at the $\Upsilon(4S)$ resonance.

Speaker: Mr Bastian Kronenbitter (KIT)

Slides PANIC_2014_belle.pdf

162 Recent flavor physics results at CMS

Thanks to the excellent tracking and muon identification performance, combined with a flexible trigger system, the CMS experiment at the Large Hadron Collider is conducting a rich and competitive program of measurements in the field of heavy flavor physics. In this talk we review our most recent results on heavy flavour physics, based on a data sample collected by the CMS detector.

Speaker: Mr Paolo Ronchese (Univ. di Padova e Sez. dell'INFN)

Slides panic14_hfResultsCMS.pdf

163 Rare Decays at LHCb

Electroweak penguin b-hadron and c-hadron decays are very sensitive to physics beyond the Standard Model. Recent LHCb measurements have shown indications of large unexpected asymmetries in B→K*μμ, hints of lepton universality violation, and the first observation of the photon polarisation in b→sγ decays. We report the most recent LHCb results in this sector.

Speaker: Ms Fatima Soomro (Lausanne EPFL)

Slides FSoomro_RD_PANIC_280814.pdf

Neutrinos and related astrophysical implications

Convener: Dr Kathrin Valerius (Universität Erlangen-Nürnberg, Physikalisches Institut, Abt. II)

164 The effect of Quantum Gravity on astrophysical neutrino flavor observables.

At the quantum level, an interaction of a neutrino with a graviton may trigger the collapse of the neutrino flavor eigenstate to a neutrino mass eigenstate. I will present that such an essentially quantum gravity effect may have strong consequences for neutrino oscillation phenomena in astrophysics due to the relatively large scattering cross section of relativistic neutrinos off massive sources of gravitational fields (the case of gravitational Bethe-Heitler scattering). This results in a new technique for the indirect detection of gravitons by measuring the flavor composition of astrophysical neutrinos.

Speaker: Mr Jonathan Miller (Universidad Tecnica Federico Santa Maria)

Slides PANIC14QG.pdf

165 Recent Results from the ANTARES Neutrino Telescope

The ANTARES neutrino telescope is located in the Mediterranean Sea at a water depth of about 2500m, roughly 40km south of the town of Toulon at the French coast. It is detecting neutrinos by measuring the Cherenkov light emitted by relativistic secondary particles generated in neutrino interactions. Its primary goal is the search for astrophysical neutrinos in the TeV/PeV range. The research program comprises the search for point sources, such as gamma ray bursts, and for a diffuse flux in excess of the background of atmospheric neutrinos. Furthermore, an indirect search for dark matter is conducted and ANTARES is part of several multi-messenger analyses, based on temporal and/or spatial coincidences with other cosmic probes. The ANTARES detector also comprises an array of underwater pressure sensors (hydrophones) which are used for the investigation of acoustic neutrino detection techniques. In this contribution, recent results from the ANTARES neutrino telescope will be presented.

Speaker: Dr Robert Lahmann (ECAP/University of Erlangen)

Slides panic2014_lahmann.pdf

166 Neutrino Physics with the Precision IceCube Next Generation Upgrade (PINGU)

The Precision IceCube Next Generation Upgrade (PINGU) is a proposed low-energy extension to the IceCube Neutrino Observatory, located at the geographic South Pole. PINGU will increase IceCube’s sensitivity to neutrinos with energies down to a few GeV with a multi-megaton effective volume. For every year of PINGU detector operation, tens of thousands of atmospheric neutrinos will be collected. This high statistics dataset will allow PINGU to resolve the neutrino mass hierarchy (NMH) via study of atmospheric neutrinos that undergo Mikheyev-Smirnov-Wolfenstein and parametric oscillations as they pass through the Earth. The distinction between the normal and inverted NMH at 3sigma significance should be achieved with an estimated 3.5 years of data using current baseline geometry. The full complement of systematic uncertainties and the results from an initial geometry optimization will be presented. I will also discuss the PINGU sensitivity to precision measurements of atmospheric neutrino mass-mixing parameters.

Speaker: Dr Tomasz Palczewski (The University of Alabama)

Slides PANIC14_tp.pdf

167 The NOvA neutrino experiment

The NOvA experiment is a long base-line accelerator based neutrino oscillation experiment. It uses the upgraded NuMI beam from Fermilab and measures electron neutrino appearance and muon neutrino disappearance at its far detector in Ash River, Minnesota. Goals of the experiment include measurements of theta13, mass hierarchy and the CP violating phase. NOvA has begun to take neutrino data and first neutrino candidates are observed in its far detector. This talk provides an overview of the scientific reach of the experiment, the status of detector construction and physics analysis, as well as the first data.

Speaker: Mr Filip Jediny (Czech Technical University in Prague)

Slides Nova_Jediny_PANIC14.pdf

168 First results from MINOS+ and final results from MINOS

The MINOS and MINOS+ experiments are long-baseline neutrino oscillation experiments using the MINOS detectors in two incarnations of the Fermilab NuMI neutrino beam. The first combined MINOS and MINOS+ results, which yield the most precise measurement of the mass-splitting dm2_32, will be presented. The data are also used to probe the theta23 octant degeneracy, the mass hierarchy and the CP violating phase. Also presented is the final sterile neutrino analysis using data collected by MINOS. The first look at neutrino mixing using the upgraded NuMI beam, and future prospects of the MINOS+ experiment will be shown.

Speaker: Dr Leigh Whitehead (UCL)

Slides minosPANIC2014.pdf

New concepts and techniques for accelerators and particle detectors

Convener: Dr Eckhard Elsen (DESY)

169 Evaluation of the MPD/NICA detector capabilities for studies of hyperons and mesons in dense nuclear matter

Hyperons could provide essential signatures of the excited and compressed baryonic matter. Their identification and reconstruction should be one of the most important tasks of any experiment with heavy ions. The MPD/NICA start version's characteristics for measuring hyperons (\Lambda, \bar\Lambda, \Xi^-, \Omega^-) obtained on Monte Carlo simulated event samples of gold-gold collisions at NICA energies will be presented. It will be shown that the MPD start version will provide a good opportunity to perform such measurements and the current status of the event reconstruction algorithms and software is adequate for a study of the strangeness production at NICA (achieved mass resolution 2-3 MeV/c^2 with high enough yields).

Speaker: Veronika Vasendina (Joint Institute for Nuclear Research, Dubna, Russia)

Slides VV_PANIC.pdf VV_PANIC.pptx

170 HADES investigating in-medium hadron properties at FAIR

The HADES spectrometer installed at GSI Darmstadt is a second generation experiment designed to measure e+e- pairs (dielectrons) in the SIS∕BEVALAC energy regime. The main goal of the experiment is to measure electromagnetic emissivity of a compressed baryonic matter formed in course of heavy ion collisions and ultimately learn about in-medium hadron properties. For this purpose a dedicated programme focusing on systematic investigation of dielectron production in nucleon-nucleon, proton-nucleus and heavy ion reactions is on-going. A comparison of the nucleon-nucleon data to the one obtained in more complex systems allows for isolation of true in-medium effects. Furthermore, thank to excellent particle identification capabilities of the detector, investigations have also been extended to strangeness production, which at these energies is confined to a high density zone of the collision. The obtained data call for further systematic investigations at higher baryonic densities, where no dielectron and very limited data on strangeness exist. For this reason, experiments with HADES on the coming FAIR facility are under preparation. The existing device will be complemented by an electromagnetic calorimeter based on lead-glass modules. The calorimeter will enable to get in addition data on production of the pi0 and eta mesons via their two-photon decay. No respective data are presently available for the energy range 4--40 AGeV, with the consequence that such upgrade is needed to avoid interpretation of future dielectron data based solely on theoretical models. In the talk short overview of results obtained so far will be given. Perspective for future investigations within new FAIR project and the R&D effort to upgrade the spectrometer will be described in detail.

Speaker: Mr Andrej Kugler (Nuclear Physics Institute ASCR)

Slides Kugler_HADES_at_FAIR.pptx

171 LHeC and eRHIC NON-SCALING FFAG DESIGN WITH ENERGY RECOVERY LINAC

The future Electron Ion Colliders (EIC) LHeC and eRHIC will be able to collide electrons with ions in the LHeC case, or polarized electrons with polarized protons/He+3 or heavy ions in eRHIC. Ions have been already used in both colliders in the existing complex of accelerators of Large Hadron Collider (LHC) and Relativistic Heavy Ion Colliders (RHIC). Electron acceleration in both EIC's are based on a concept of Energy Recovery Linacs (ERL), where they will reach energies of 60 or 21 GeV for LHeC or eRHIC, respectively, and consequently decelerated to the initial linac energies almost completely recovering the energy. We present solution of two Non-Scaling Fixed Field Alternating Gradient arcs to enable electrons to make multiple passes through linac and to collide with ions at the highest energy.

Speaker: Dr DEJAN TRBOJEVIC (Brookhaven National Laboratory)

Slides DejanTrbojevic-ID-136-3.pptx

172 Future opportunity with Germanium detectors at the Jinping underground Laboratory

The China JinPing underground Laboratory (CJPL) is the deepest underground laboratory in operation in the world. It is located under the Jinping mountain, in the southwestern Chinese province of Sichuan. The experimental hall has an overburden of about 2400 m of rock. The measured muon flux in CJPL is around 60 muons per squaremeter per year. This extremely small muon flux make CJPL a perfect place to host low background experiments looking for really rare events like neutrino less double beta decay (0nuBB decay) or dark matter (DM) interactions. Since Ge76 can decay via double beta decay, several 0nuBB decay experiments used and use Germanium detectors (e.g. Heidelberg-Moscow, GERDA and Majorana). These fulfill also many experimental requirements for DM search, indeed numerous DM experiments use this technology (e.g. CDMS, Edelweiss and CDEX). The idea is to combine these two searches in a unique one Ton Germanium facility placed in CJPL. The sensitivity achievable was investigated. Research on detector development is performed at the Max-Planck-Institute for Physics in Munich. The goal is to use the same detector for both searches. Some results on events due to contaminations on the detector surfaces are also presented.

Speaker: Mrs Lucia Garbini (Max-Planck-Institute for Physics)

Slides panic_hamburg2014.pdf

173 The Progress of JUNO Liquid Scintillator Research

This talk introduces the progress of JUNO (Jiangmen Underground Neutrino Observatory) liquid scintillator(LS) research. JUNO will need 20kt LS, and energy resolution of detector reach to 3%/E. So it needs longer attenuation length and higher light yield LS. The method and results of LS purification and the LS performance measurement are reported.

Speaker: Prof. Li ZHOU (Institute of High Energy Physics, CAS)

Slides JUNO_LS__PANIC_2014.pdf

Quarks and gluons in hadrons, the hadron spectrum

Convener: Prof. Nicole D'Hose (CEA Saclay)

174 Studies of light mesons at COMPASS

COMPASS is a fixed-target experiment at the CERN SPS aimed to study the structure and dynamics of hadrons. Data with negative (mostly $\pi^-$) hadron beams of $190\,\text{GeV}/c$ has been taken to study in particular light mesons. Their spectrum is investigated in diffractive dissociation reactions with final-states containing $\pi$ and $\eta$. At four-momentum transfers to the target between $0.1$ and $1.0\,\text{GeV}^2/c^2$ the properties of known resonances are studied, and new, possibly exotic, states are searched. Novel analysis techniques have been developed to also probe the sub-systems of the final-states. The structure of light mesons is studied in photo-production reactions induced by a pion beam scattering off solid targets. The radiative widths of the $a_2\left(1320\right)$ and, for the first time, that of the $\pi_2\left(1670\right)$ have been extracted from COMPASS data. In addition these reactions can be used to measure the polarizability of the $\pi$, and compare this to predictions of chiral perturbation theory.

Speaker: Mr Sebastian Uhl (Technische Universität München)

Slides suhl_compass_hadron.pdf

175 Test of the OZI rule and spin alignment measurements with the COMPASS > experiment at CERN

The Okubo-Zweig-Iizuka (OZI) rule states that processes with disconnected quark lines are suppressed. The production of phi mesons from non-strange hadrons is predicted to be suppressed w.r.t. omega by a factor 4.2•10^-3. Violations are often interpreted as gluonic intermediate states or as evidence for hidden strangeness in the nucleon. The reaction pp->pVp (V= omega, phi) has been studied with the COMPASS spectrometer in 2008 and 2009, using a 190 GeV/c proton beam impinging on a liquid hydrogen target. The cross section ratio was measured and a significant OZI violation factor of ~4 was found. Its kinematic dependence of the Feynman x_F and the M(p V) mass is discussed in terms of diffractive production of baryon resonances in competition with central production. The M(p omega) spectrum has a rich structure, indicating the importance of baryon resonances decaying into p omega, in sharp contrast to the structureless M(p phi) spectrum. The spin density matrix element rho_00 of the vector mesons in selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on x_F and M(p V) are found. Outside the resonant region, the OZI violation factor is ~8, independently of x_F.

Speaker: Dr Karin Schoenning (Dept. of Physics and Astronomy, Uppsala University, and CERN)

Slides OZI_schoenning_PANIC_v2.pdf

176 Partial wave analyses of the $\pi^+\pi^-\pi^-$ system with upgraded VES setup

Partial Wave Analysis of the $\pi^+\pi^-\pi^-$ system produced by 28 GeV/c $\pi^-$ beam on berillium target is presented. About $30\cdot10^6$ events in the wide $|t|$-prime range $0\ldots1~GeV^2/c^2$ are collected with upgraded VES setup. The size of the data sample is 2.5 times larger than that previously analyzed by VES. Data are analyzed using formalism of density matrix with unlimited rank. We will discuss status of the states a1(1700), a2(1700), decay modes with $J^{PC}=1^{++}$ P-wave $f0(980)\pi$, $J^{PC}=2^{-+}$ D-wave $f0(980)\pi$, structure of exotic P-wave $\rho(770)\pi$ with $J^{PC}=1^{-+}$.

Speaker: Mr Igor Katchaev (Institute for High Energy Physics, Protvino, Russia)

Paper kachaev_igor.pdf

Slides kachaev_panic14.pdf

177 Medium-heavy nuclei from lattice quantum chromodynamics

Mass and structure of 16^O and 40^Ca are studied on the basis of quantum chromodynamics (QCD), the fundamental theory of the strong interaction. We derive two-nucleon potentials from lattice QCD simulations by the recently developed HAL QCD method. Then we apply the results to the structure of medium-heavy nuclei (16^O and 40^Ca) using the Brueckner-Hartree-Fock theory. We find that these two nuclei are bound and possess shell structures for the heavy quark mass corresponding to the pseudo-scalar meson mass of 469 MeV (the nucleon mass of 1161 MeV). Obtained total binding energies, 33 MeV for 16^O and 108 MeV for 40^Ca, are rather smaller than the experimental data, which is due to the heavy quark mass in our lattice QCD simulations. Realistic results will be obtained in the near future by using the full QCD configurations currently generated by K-computer with the pion mass 135 MeV and the lattice volume (10 fm)^3. The present study demonstrates that our approach is quite promising for investigating various properties of atomic nuclei starting from QCD.

Speaker: Prof. Takashi Inoue (Nihon University, College of Bioresource Sciences)

Slides Hamburg_Inoue.pdf

178 Diquark and Baryon Masses in Composite Fermion Approach

see submitted pdf file

Speaker: Prof. Aparajita Bhattacharya (Jadavpur University)

Slides Panic_final-corrected_2.pdf

179 GlueX detector and physics program

The GlueX experiment at Jefferson Lab will use a linearly polarized photon beam to explore the light quark meson spectrum, with emphasis on mesons with exotic quantum numbers. These exotic mesons cannot be formed by a simple quark-antiquark pair and could indicate the excitation of gluonic degrees of freedom. The GlueX detector is nearly complete and first beam is expected later in the year. Current detector commissioning efforts will be presented along with an overview of the GlueX physics program.

Speaker: Mr Will Levine (Carnegie Mellon University)

Slides Levine_GlueX_PANIC.pdf

Quarks and gluons in hadrons, the hadron spectrum

Convener: Dr Michel Guidal (Institut de Physique Nucleaire, Orsay)

180 Measurement of spin density matrix elements in $Lambda(1520)$ photoproduction with the CLAS detector

The photoproduction reaction $\gamma p \to K^+ \Lambda(1520)$ is a topic of interest due to possible interference with the $\gamma p \to \phi p$ reaction and possible heavy excited nucleon decay to $K^+ \Lambda(1520)$. In particular, an unexplained bump has been seen in measurements of the differential cross-section and provoked theoretical work. Information about the production mechanism of this reaction can be gained from studying the angular distribution of the $\Lambda(1520)$ decay products. This distribution is parameterized by a set of spin density matrix elements and reveals the polarization of the $\Lambda(1520)$. Previous measurements of the decay distribution have been limited by low statistics, small angular coverage, and coarse binning. New, high-statistics measurements of the $\Lambda(1520)$ spin density matrix elements, using the $\Lambda(1520) \to K^- p$ decay mode, from the CEBAF Large Acceptance Spectrometer at Jefferson Lab are presented here.

Speaker: Mr William Levine (Carnegie Mellon University)

Slides Levine_Lambda1520_PANIC.pdf

181 Measurement of $\sigma_{1/2}$ and $\sigma_{3/2}$ in Photoproduction of $\pi^{0}\pi^{0}$ and $\eta\pi^{0}$ Pairs off Neutrons in the Nucleon Resonance Region

Meson photoproduction offers unique possibilities to investigate the nucleon and its excited states. Double meson photoproduction has the great advantage of enabling access to higher lying nucleon resonances that have no significant decay mode to the nucleon ground state via photoproduction of single mesons. Among the different meson pairs $2\pi^{0}$ is in particular interesting as non-resonant background terms as pion-poles or Kroll-Rudermann are strongly suppressed because photons couple only weakly to neutral pions. In addition, photoproduction of $\eta\pi^{0}$ meson pairs is a very selective decay channel since the isoscalar properties of the $\eta$ forbid its production in cross-over $N*\to\Delta*$ transitions. Whereas for the reactions on the proton a lot of experimental data is available, data for the reactions on the neutron is sparse. In addition, even though in recent years much progress in the theoretical description of the results was achieved, the available models are still very controversial even at low energies where only few resonances contribute. The measurement of single and double polarization will help to reveal the different resonance contributions and thereby serve as an important input for the theoretical description of the structure and the excitation spectrum of the nucleon.\\ This work presents results of the helicity dependent cross sections of photoproduction of $\pi^{0}\pi^{0}$ and $\eta\pi^{0}$ meson pairs off quasi-free protons and neutrons in the second and third nucleon resonance region.

Speaker: Mr Manuel Dieterle (Department of Physics, University of Basel)

Slides dieterle_panic_0814_v0.pdf

182 Helicity Dependent Cross Sections in $\eta$ Photoproduction off Quasi-Free Protons and Neutrons

The identification of the relevant effective degrees of freedom of QCD is the most important step in order to understand the structure of the nucleon. Since the resonance contributions to the excitation spectrum are often broad and overlapping, the comparison of experimental data and theoretical models is rather difficult. Single and double polarization observables allow the determination of the quantum numbers of the contributing resonances and are therefore an ideal tool to investigate the excitation spectrum of the nucleon.\\ A very selective channel in this context is the photoproduction of $\eta$ mesons. Due to the isoscalar property of the $\eta$, $\Delta$ resonances can not decay to the ground state by emitting a $\eta$. Furthermore P$_{11}$(1440) and D$_{13}$(1520) resonances have a very small branching ratio into the N$\eta$ final state (close to threshold high orbital angular momenta are strongly suppressed). Especially, the investigation of photoproduction of $\eta$ mesons is very interesting as the resulting cross section on the neutron shows a large resonance-like structure, beyond the dominating S$_{11}$(1535), which is not seen on the proton.\\ In this work we will present results of the double polarization observable E and the corresponding helicity dependent cross sections $\sigma_{1/2}$ (photon and target spin anti-parallel) and $\sigma_{3/2}$ (photon and target spin parallel) of $\eta$-photoproduction off quasi-free protons and neutrons which will help to constrain the origin and quantum numbers of this unknown structure.

Speaker: Ms Lilian Witthauer (Department of Physics, University of Basel)

Slides witthauer_panic14.pdf

183 Polarization Observables $T$ and $F$ in Single $\mathbf{\pi^0}$ and $\mathbf{\eta}$-Photoproduction off Quasi-Free Nucleons

Meson photoproduction has developed into a powerful tool to study the nucleons excitation spectrum and test effective quark models which operate in the non-perturbative regime of QCD. An insight into the $J^P$ configurations and isospin decompositions of the contributing resonances is gained by measuring a minimal set of polarization observables on both the proton and the neutron. Single $\pi^0$ and $\eta$-photoproduction off a transversally polarized D-butanol target has been measured with circularly polarized bremsstrahlung photons generated by the MAMI-C electron microtron. With the nearly $4\pi$ acceptance of the combined Crystal Ball/TAPS setup the double polarization observable $F$ and the target asymmetry $T$ can be extracted for the first time for polarized, quasi-free neutrons over a wide energy and angular range.

Speaker: Mr Thomas Strub (University of Basel)

Slides strub.pdf

184 Measurements of the Form Factor in VPgamma* transitions and study of the eta-->pi+pi-pi0 Dalitz plot at KLOE

The KLOE experiment has collected 2.5 fb-1 at the peak of the phi resonance at the e+e- collider DAPHNE in Frascati. A new beam crossing scheme, allowing for a reduced beam size and increased luminosity, is operating at DAPHNE. The upgraded KLOE-2 detector is successfully rolled in inside this new interaction region and is ready to acquire collision data. The V-->Pgamma Dalitz decays, associated to internal conversion of the photon into a lepton pair, are not well described by the Vector Meson Dominance (VMD) models, as in the case of the process omega --> pi0 mu+ mu-, measured by the NA60 collaboration. The only existing data on phi --> eta e+ e- come from the SND experiment, which has measured the Mee invariant mass distribution on the basis of 213 events. At KLOE, a detailed study of this decay has been performed using both eta-->pipipi final states. Simple analysis cuts provide clean signal events, with a residual background contamination of 2-3%. With the fully neutral eta decay channel, we obtain the measurement of the branching fraction for the process phi --> eta e+ e-, with an accuracy improved by a factor of five with respect to the previous most precise measurement, and of the slope of the transition form factor, which is in agreement with VMD expectations. We have also studied the decay phi --> pi0 e+ e-, where no data are available on transition form factor. Dedicated analysis cuts strongly reduce the main background component of Bhabha events to ~20%, leading to ~4000 signal events in the whole KLOE data set. We have also obtained a new, precise results on the isospin-violating decay eta-->pi+pi-pi0, sensitive to the light-quark mass ratio. The first study, overcoming in precision previous results published in year 2008-2010, was suggested by the theoretical work: Leutwyler, Mod.Phys.Lett. A28 (2013) 1360014, aiming to a better determination of the light-quark mass ratio through the dispersive analysis of the eta--> 3 pi decay.

Speaker: Ms Li Balkestahl (Uppsala University)

Slides Li_panic.pdf

Quarks and gluons in hot and dense matter

Convener: Dr Matthew Lamont (Brookhaven National Lab)

185 Proton-lead measurements using the ATLAS detector

Measurements of soft and hard particle production in proton-lead collisions at the LHC have provided surprising results. Studies of correlations in the production of soft particles have provided results that suggest strong collective behavior similar to that observed in lead-lead collisions. Measurements of jets and high-pT hadrons have shown an unexpected enhancement in the production of high-pT charged particles and an a similarlarly unexpected variation of the jet yield with proton-lead collision centrality. An overview of ATLAS proton-lead measurements will be presented that illustrate these problems.

Speaker: Mr Martin Spousta (Charles University)

Slides Spousta_Panic2014_20140825.pdf

186 LHCb results in proton-nucleus collisions at the LHC

The production of J/ψ and Υ-mesons decaying into dimuon final state is studied at the LHCb experiment, with rapidity 1.5 < y < 4.0 or -5.0 < y < -2.5 and transverse momentum pT < 15 GeV/c, in proton-lead collisions at a proton-nucleon centre-of-mass energy of 5 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 1.6/nb. The forward-backward production ratio and the nuclear modification factor are determined for J/ψ and Υ(1S). Indication of forward backward production asymmetry is observed. There is also an indication of J/ψ and Υ(1S) production suppression with respect to proton-proton collisions in forward region and anti-shadowing effect in backward region. Results on vector boson production are also presented.

Speaker: Ms Mueller Katharina (Universität Zürich)

Slides km2_panic_v2.pdf

187 ALICE results on vector meson photoproduction in ultra-peripheral p-Pb and Pb-Pb collisions

Pb nuclei, accelerated at LHC, are sources of strong electromagnetic fields that can be used to measure photon-induced interactions in a new kinematic regime. These interactions can be studied in ultra-peripheral p-Pb and Pb-Pb collisions where impact parameters are larger than the sum of nuclear radii and hadronic interactions are strongly suppressed. Heavy quarkonium photoproduction is of particular interest since it is sensitive to gluon distributions in target hadrons. The ALICE Collaboration has studied J/psi and psi(2S) photoproduction in ultra-peripheral Pb-Pb collisions and exclusive J/psi photoproduction off protons in ultra-peripheral p-Pb collisions at the LHC. Implications for the study of gluon density distributions and nuclear gluon shadowing will be discussed. Recent ALICE results on rho0 photoproduction will be also presented.

Speaker: E. Kryshen (CERN)

Slides 2014-08-28-kryshen-panic-2.pdf

188 Anisotropic flow from hard partons in ultra-relativistic nuclear collisions

Anisotropies of the azimuthal hadron distributions measured in nuclear collisions at highest energies carry information about the anisotropies of collective transverse expansion. Through a comparison of these data with hydrodynamic simulations one hopes to extract transport coefficients of the hot nuclear matter. It is widely accepted that the flow anisotropies have their root in strong inhomogeneities within the hot matter shortly after the impact. We present a 3D hydrodynamic simulation where anisotropies are generated by momentum deposited from hard patrons during the evolution of the fireball. We analyse to what extent this mechanism can generate the observed anisotropic flow.

Speaker: Dr Boris Tomasik (Univerzita Mateja Bela)

Slides tomasik_panic.pdf

Standard model physics at the TeV scale

Convener: judith katzy (desy)

189 Measurements of vector boson production in ATLAS and CMS

Vector boson production in p≠p collisions in LHC Run≠1 has been extensively studied by ATLAS and CMS. Charged and neutral current Drell Yan cross sections are sensitive to the parton distribution functions of the proton and electroweak corrections. The measurements of the neutral current Drell≠Yan process in three distinct kinematic regions, i.e. at the Z boson mass peak, below and above, are performed. The results are compared to NLO Monte Carlo simulations and to NNLO QCD predictions corrected for NLO EW effects calculated using various parameterizations of the parton distribution functions. An overview of these results is given.

Speaker: Ms Manuella Vincter (Carleton)

Slides talk_PANIC_MGV_WZ.pdf talk_PANIC_MGV_WZ.pptx

190 ATLAS measurements of vector boson production with associated jets

The production of jets in association with a W or a Z boson is an important process to study QCD in a multi≠scale environment in p≠p collisions at the LHC. The cross sections, differential in several kinematics variables, and their ratios (W+jets)/(Z+jets), have been measured up to high jet multiplicities and high jet transverse momenta, and compared to state≠of≠the≠art QCD calculations and Monte Carlo simulations. In addition, the production of heavy flavour in association with a W or Z boson represents is sensitive to the parton density functions and to the modeling heavy≠quark flavour production mechanisms. Measurement of the transverse momentum of the Z boson is sensitive to soft resummation effects for small momentumtransfers and to multiple hard jet emissions for large momentum transfers, probing QCD in a unique way. The data are used to tune next≠to≠leading order plus parton shower Monte Carlo simulations. An overview of these results is given.

Speaker: Mr Mark James Tibbetts (Berkeley LBNL)

Slides ATLAS_Vjets_Tibbetts.pdf ATLAS_Vjets_Tibbetts.pptx

191 Vector Boson + Jets Production at CMS

Vector Boson + Jets production measurements are tests of perturbative QCD calculations and PDFs. Hence these measurements provide us chances to verified MC generators and the background modeling techniques of many searches. We will present measurements of the vector boson + jet production in pp collisions at sqrt(s) = 7 TeV and 8 TeV, using the data collected with the CMS detector. The results of the production cross section, differential cross sections as a function of jet or boson kinematic variables and the angular correlation between the boson and the jets will be included in this talk.

Speaker: Yun-Ju Lu (National Central University)

Slides YunJuLu_PANIC2014_20140828_v2.pdf

192 The Higgs Physics Program at the International Linear Collider

One of the key topics in the physics program of the ILC is the precision measurement of the couplings of the Higgs boson. The two main production modes, ZH production and W boson fusion, provide access to all major Higgs boson decay modes with relatively small backgrounds. The ZH process provides the possibility for a model-independent tagging of Higgs production, allowing measurement of absolute branching ratios and the observation of invisible and other exotic decays. At higher energies, the W fusion process gives high rates for precision measurements and allows the model-independent determination of the Higgs boson width and the individual Higgs couplings. At energies of 500 GeV and above, rarer production modes provide direct access to the top Yukawa coupling in ttH events and the measurement of the Higgs self coupling in double Higgs production. This contribution will provide an overview of the Higgs physics program at ILC, with results from full-simulation studies in the ILC detector concepts.

Speaker: Felix Sefkow (DESY)

Slides HiggsILC-FSefkow-Panic14.pdf

193 Top Quark Precision Physics at Linear Colliders

The future precision studies of the Standard Model require excellent knowledge of the top quark mass, to an accuracy of 100 MeV or better. A threshold scan in e+e- annihilation enables a precise measurement in theoretically well-defined mass schemes. The measurement requires a combination of precise QCD calculations, excellent detection efficiency and recognition of top quark events, and excellent control of the initial beam energy and profile. Above the production threshold, the efficient identification to top pair events combined with polarized beams provides the potential to extract the form factors for the top quark couplings with high precision and in a model-independent way, resulting in excellent sensitivity to physics beyond the standard model. We will provide an overview of top physics at linear colliders based on results from full-simulation studies of top quark pair production in the detectors proposed for ILC and CLIC.

Speaker: Dr Frank Simon (Max-Planck-Institute for Physics)

Slides TopAtLC.pdf

194 Higgs Physics at CLIC

The Compact Linear Collider (CLIC) is an attractive option for a future multi-TeV linear electron-positron collider, offering the potential for a rich precision physics programme, combined with sensitivity to a wide range of new phenomena. The physics reach of CLIC has been studied in the context of three distinct centre-of-mass energy stages, 350 GeV, 1.4 TeV and 3.0 TeV. This staged scenario provides the ideal environment for precise studies of the properties of the ~125 GeV Higgs boson. Operation at 350 GeV allows the couplings and width of the Higgs boson to be determined in a model-independent manner through the study of the Higgs-strahlung and WW-fusion processes. Operation at higher centre-of-mass energies provides high statistics for even more precise measurements and the potential to study the top Yukawa coupling and even the Higgs boson self-coupling. In this talk we explore the potential of the CLIC Higgs physics programme, based on full simulation studies of a wide range of final states. The evolution of the physics sensitivity with centre-of-mass energy is presented in terms of model-independent coupling fits and the constrained kappa fits employed at the LHC.

Speaker: Dr Frank Simon (Max-Planck-Institute for Physics)

Slides HiggsAtCLIC.pdf

Tests of symmetries and conservation laws

Convener: Dr Chloé Malbrunot (CERN)

195 Parity-Violating Electron Scattering: Recent Results and Future Prospects

The technique of measuring tiny single-spin asymmetries in the scattering of longitudinally polarized relativistic electrons off unpolarized fixed targets is well-established. These measurements, which exploit the non-conservation of parity symmetry by the neutral weak interaction, are being used in a variety of applications to address fundamental questions in nuclear and particle physics. One thrust over the past two decades has been the measurements of nucleon neutral weak form factors at intermediate four-momentum transfer 0.1 < Q^2 < 1 (GeV/c)^2 , which provides information about the role of virtual strange quarks on the charge and current distributions inside nucleons. A more recent topic is the elastic neutral weak amplitude at very low Q^2 from scattering off a heavy spineless nucleus, which is sensitive to the presence of a neutron skin and provides model-independent information about the density dependence of the symmetry energy in dense nuclear matter. Finally, we discuss the neutral current elastic amplitude at very low Q^2 off protons and electrons and in the DIS regime off deuterium, which allows precision measurements of the weak mixing angle at low energy and is thus sensitive to new physics at the TeV scale, in a manner complementary to collider searches. The physics implications of recent results, potential measurements from experiments designed to exploit the 12 GeV upgrade of Jefferson Laboratory, as well as new ideas at future facilities are discussed.

Speaker: Mr Krishna Kumar (UMass Amherst)

Slides kumar_pves_final.pdf

196 The Qweak Experiment: First Determination of the Weak Charge of the Proton

The Qweak experiment, which completed a two-year data taking phase in May 2012 at Jefferson Lab, has made the first determination of the weak charge of the proton. We access the weak charge by measuring the parity-violating asymmetry in the elastic scattering of polarized electrons from protons at a small squared four-momentum transfer of Q^2 = 0.025 (GeV/c)^2. Due to the interference of the photon and Z-boson exchange processes, this asymmetry is proportional to the weak charge of the proton at low momentum transfers. We determined a value for the asymmetry of Aep = -279 +/- 35 (statistics) +/- 31 (systematics) ppb, which is the smallest and most precise asymmetry ever measured in polarized electron-proton scattering. To achieve the precision necessary to measure this small asymmetry, we integrated events from eight fused silica detectors by scattering the high-current polarized electron beam on a 35 cm long liquid hydrogen target. Based on only 4% of the total data collected in the experiment, and by incorporating earlier results from earlier parity-violating electron scattering experiments, we find a value for the weak charge of the proton of QpW = 0.064 +/- 0.012 in agreement with predictions of the Standard Model of particle physics. The projected precision for the full data set will result in sensitivity to new physics at the TeV scale, complementing searches at the Large Hadron Collider. In addition to the search for physics beyond the Standard Model, we will measure parity-violating and parity-conserving observables using longitudinally and transversely polarized electron beam, in elastic and inelastic scattering channels, on proton and aluminum targets by observing both electrons and pions in the final state. These precise measurements will allow us to constrain various relevant models in hadronic and nuclear physics.

Speaker: Prof. Paul King (Ohio University)

Slides pking_panic2014.pdf

197 Parity Violation Inelastic Scattering Experiments at JLab

We report on the measurement of parity-violating (PV) asymmetries in the deep inelastic scattering (DIS) and nucleon resonance regions using inclusive scattering of longitudinally polarized electrons off an unpolarized deuterium target. The effective weak couplings C_2q are accessible through the DIS measurements. Here we report a measurement of the PV asymmetry, which yields a determination of 2C_2u - C_2d with an improved precision of a factor of five relative to previous results. These results indicate evidence with 95% confidence that the 2C_2u - C_2d is non-zero. This experiment also provides the first parity-violation data covering the whole resonance region, which provide constraints on nucleon resonance models. Finally, the program to measure PV-DIS at JLab in the 12 GeV era will be discussed using the Solenoidal Large Intensity Device (SoLID).

Speaker: Dr Vince Sulkosky (University of Virginia)

Slides Sulkosky_pvdis_PANIC2014.pdf

198 Latest results from MEG and status of MEG-II

Within the Standard Model (SM), in spite of neutrino oscillations, the flavor of charged leptons is conserved in very good approximation, and therefore charged Lepton Flavor Violation (cLFV) is expected to be unobservable. On the other hand, most new physics models predict cLFV within the experimental reach, and processes like the mu -> e gamma decay became standard probes for physics beyond the SM. The MEG experiment, at the Paul Scherrer Institute (Switzerland), searches for the mu to e gamma decay, down to a Branching Ratio of about 5 x 10^-13, exploiting the most intense continuous muon beam in the world and innovative detectors. In this talk I will present the latest results from MEG, and the status of its upgrade (MEG-II), aiming at an improvement of the sensitivity by one order of magnitude within this decade.

Speaker: Dr Francesco Renga (INFN Roma)

Slides renga_panic2014.pdf

199 The Mu2e Experiment at Fermilab

The Mu2e Experiment at Fermilab will search for coherent, neutrino-less conversion of muons into electrons in the field of a nucleus with a sensitivity improvement of a factor of 10,000 over existing limits. Such a lepton flavor-violating reaction probes new physics at a scale inaccessible with direct searches at either present or planned high energy colliders. The experiment both complements and extends the current search for muon decay to electron+gamma at MEG and searches for new physics at the LHC. We will present the physics motivation for Mu2e, the design of the muon beamline and the detector, and the current status of the experiment.

Speaker: Mr Giovanni Tassielli (INFN Lecce)

Slides The_Mu2e_Experiment_at_Fermilab.pdf

16:00 Coffee Break

Beyond Standard Model

Conveners: Dirk Zerwas (LAL Orsay), Johannes Haller (University Hamburg)

200 Search for Dark Matter at CMS

Searches at the LHC are complementary to direct detection experiments. Very low masses and several DM properties can only be studied at the LHC. In this very recent field at accelerators, several analyses were developed and performed with 2012 data. Final states with Monojet, monophoton, and monolepton are all considered, as well as dark matter particles that are produced in association with top quarks. The interpretation of these results as a WIMP are discussed.

Speaker: kerstin Hoepfner (RWTH Aachen)

Slides CMS_DM_KHoepfner.pdf

201 Searches for dark matter and extra dimensions with the ATLAS detector

Different approaches to finding evidence for dark matter at the LHC are presented. These include searches for events with large missing transverse momentum and a single jet, photon or W/Z boson. Searches for hidden sectors in events with long-lived particles resulting in displaced hadronic vertices or lepton-jet signatures are also reported. Finally, studies sensitive to the presence of extra spatial dimensions are described, as for example classical and quantum black holes and other non-resonant phenomena. Results from sqrt(s) = 8 TeV data taking are presented.

Speaker: Mr Christophe Clement (Stockholm)

Slides Presentation_final_v2.pdf

202 Exploration of Physics Beyond the Standard Model at the International Linear Collider

Although the LHC experiments have put strong limits on coloured supersymmetric states, it is still possible that electroweakly interacting supersymmetric particles have masses in the range 100-200 GeV. Even outside of supersymmetry, candidates for the particle of dark matter may have masses in this range unconstrained by LHC data. In e+e- annihilation, the low backgrounds, precise knowledge of the initial-state beams, and sensitivity to small energy depositions provides discovery potential complementary to the LHC, for instance in cases with small mass differences. These conditions are also ideal for the precise measurements of new particle states required to elucidate the structure of the underlying model in scenarios where colored sparticles are discovered during the 14 TeV run of the LHC, which could hint to the existence of lower-mass electroweak states. This contribution will report the current status of studies for the prospects of measurements of WIMPs, Higgsinos and other light electroweak states at the International Linear Collider, with results based on simulation of the detectors proposed for the ILC. It also discusses how the combined observations from LHC and ILC can be used to determine MSSM parameters in models with large numbers of free parameters.

Speaker: Juergen Reuter (DESY)

Slides PANIC_2014.pdf

203 Prospects for Beyond Standard Model Physics at CLIC

The Compact Linear Collider (CLIC) is an attractive option for a future multi-TeV linear electron-positron collider. A staged construction in several centre-of-mass energy steps from a few hundred GeV up to 3 TeV is foreseen. At high energies, CLIC provides sensitivity to a wide range of phenomena beyond the Standard Model through direct observation of new particles and precision measurements. An overview of these opportunities is given in this presentation. CLIC is in particular well suited for the measurement of weakly interacting states due to the clean experimental conditions and low backgrounds compared to hadron colliders. Most studies are based on full detector simulations using Geant4 and considering pileup from gamma gamma -> hadrons interactions. The production of supersymmetric particles like sleptons and gaugions was studied in detail in several different models. The scenarios discussed in this presentation include an extended Higgs sector, Z' physics and other models.

Speaker: Lucie Linssen (CERN)

Slides Linssen_CLIC-BSM_PANIC-Hamburg_28Aug2014.pdf

Flavour physics - CKM and beyond

Convener: Mr Christian Linn (CERN)

204 Detecting the long-distance structure of the X(3872)

We study the X(3872) to D bar{D} pi^0 decay within a molecular D bar{D}^* picture for the X(3872) state. This mode is more sensitive to the long-distance structure of the X(3872) resonance than its J/\psi\pi\pi and J/\psi 3pi$ decays, which are mainly controlled by the details of the X(3872) wave function at short distances. We show that the D bar{D} final state interaction can be important, and that a precise measurement of this partial decay width can provide valuable information on the interaction strength between D^(*)bar{D}^{(*)} charm mesons.

Speaker: Mr Carlos Hidalgo-Duque (Instituto de Física Corpuscular (IFIC), Centro Mixto CSIC-Universidad de Valencia)

Slides PANIC-2014.pdf

205 PERSPECTIVE STUDIES OF CHARMONIUM AND EXOTICS ABOVE DD\bar THRESHOLD

The study of strong interactions and hadron matter in the process of antiproton-proton annihilation seems to be a challenge nowadays. The research of charmonium cc\bar , charmed hybrid cc\bar g and tetraquark cq(cq\prime)\bar ( q, and q\prime = u, d, s) spectra and their main characteristics (mass, width, branching ratio) in experiments using high quality antiproton beam with momentum up to 15 GeV/c, is promising to understand the dynamics of quark interactions at small distances. Charmonium and exotics spectroscopy is a good testing tool for the theories of strong interactions: QCD in perturbative and non-perturbative regimes, LQCD, QCD inspired potential models and phenomenological models. Nowadays the scalar 1P1, 1D2 and vector 3PJ, 3DJ charmonium states and higher laying scalar 1S0 and vector 3S1 charmonium states are poorly investigated. The domain above threshold is badly studied. According to the contemporary quark models namely in this domain, the existence of charmed hybrids with exotic (JPC = 0--, 0+-, 1-+, 2+-, 3-+) and non-exotic (JPC=0-+, 1+-, 2-+, 1++, 1--, 2--, 2++, 3+-) quantum numbers and tetraquarks is expected [1 - 4]. A prediction that distinguishes tetraquark states containing a cc\bar pair from conventional charmonia is possible existence of multiplets which include members with non-zero charge cu(cd)\bar , strangeness cd(cs)\bar , or both cu(cs)\bar . The detailed analysis of the spectrum of charmonium, charmed hybrids and tetraquarks with hidden charm and strangeness was carried out, and attempts to interpret a great quantity of experimental data above the DD\bar threshold were considered. New higher lying states of charmonium, charmed hybrids and tetraquarks are expected to exist in the mass region above the DD\bar threshold. But much more data on different decay modes are needed for deeper analysis. These data can be derived directly from the experiments with high quality antiproton beam. A special attention is given to the new XYZ states with hidden charm discovered recently [3 - 6]. Their interpretation is far from being obvious nowadays [2 - 4]. The experimental data from different collaborations like BES, Belle, BaBar, LHCb, CLEO, CDF were carefully studied. Some of these states can be interpreted as charmonium [7, 8] and tetraquarks [9, 10] in the framework of the combined approach proposed earlier [11, 12]. It has been shown that charge/neutral tetraquarks must have neutral/charge partners with mass values which differ by few tens of MeV. This treatment coincides with hypothesis proposed by Maiani and Polosa [13, 14]. It seems to be a promising approach and needs to be carefully verified in experiments using high quality antiproton beam with momentum ranging up to 15 GeV/c. [1] W. Erni et al., Physics Performance Report for PANDA: Strong Interaction Studies with Antiprotons, e-Print: arXiv:0903.3905v1 [hep-ex] (2009) 63 [2] S. Olsen, arXiV:0909.2713v1 [hep-ex] (2009) [3] N.Brambilla et al., European Physical Journal C 71:1534, (2011) 1 [4] J. Beringer et al., Review of Particle Physic, Physical. Review, D 86, (2012) [5] M. Ablikim et al. (BESIII Collaboration), arXiv: 1303.5949v1 [hep-ex] 24 Mar 2013 [6] M. Ablikim et al. (BESIII Collaboration), arXiv: 1308.2760v1 [hep-ex] 13 Aug 2013 [7] M.Yu. Barabanov, A.S. Vodopyanov, S.L. Olsen, Yadernaya Fizica, V.77, N.1, (2014) 1 / Physics of Atomic Nuclei, V.77, N.1, (2014) 126 [8] M.Yu. Barabanov, A.S. Vodopyanov, Fizika Elementarnyh Chastits Atomnogo Yadra Pisma, V.8, N.10, (2011) 63 / Physics of Particles and Nuclei Letters, V.8, N.10, (2011) 1069 [9] M.Yu. Barabanov, A.S. Vodopyanov, the Proceedings of the XXV International Conference on Particle Physics and Cosmology, Blois, France, May 26-31, (2013) in print [10] M.Yu. Barabanov, A.S. Vodopyanov, the Proceedings of the XV International Conference on Hadron Spectroscopy HADRON 2013, Nara, Japan, Nov 4-8, (2013) PoS (Hadron 2013) 039 [11] M. Yu. Barabanov, et al., Rus. Phys. J., V.50, N.12, (2007) 1243 [12] М. Yu. Barabanov et al., Hadronic J., V.32, N.2, (2009) 159 [13] L. Maiani, F. Piccinini, A.D. Polosa, V. Riquer, Phys. Rev. D 71 014028 (2005) [14] N. Drenska, R. Faccini, A.D. Polosa, arXiV:0902.2803v2 [hep-ph] (2009)

Speaker: Dr Barabanov Mikhail (JINR)

Slides Barabanov_PANIC2014.pdf

206 Search for exotic charmonium at BABAR

One of the most intriguing puzzles in hadron spectroscopy are the numerous charmonium-like states observed in the last decade, including charged states that are manifestly exotic. Over the years BaBar has extensively studied these states in B meson decays, initial state radiation processes and two photon reactions. We report new and additional studies on some of these states performed using the entire data sample collected by BaBar in e+e- collisions at center of mass energies near 10.58 GeV/c^2. Among these, the study of the process B -> J/psi phi K with a search for the X(4140) and X(4270) in their decays to J/psi phi, and a search for charged charmonium-like state Zc(3900)^+ in the decay Y(4260) -> J/spi pi+pi-.

Speaker: Elisabetta Prencipe (FZ Jülich)

Slides Prencipe_PANIC.pdf

207 Heavy flavor spectroscopy and b-decay properties with the ATLAS detector

ATLAS has performed searches for heavy hadrons, with results including the first observation of the chi_b(3P) Bottomonium states. New results in this program are discussed, including searches for excited b-hadrons and new decay modes of b-hadrons as well as the bottomonium counterpart of X(3872). We also review ATLAS studies of B-hadron decays, including the measurement of the parity violating asymmetry parameter alpha_b in Lambda_b -> Lambda J/psi, obtained from the study of angular correlations in the p pi- mu+ mu- final state. The measurement is compared to predictions based on perturbative QCD and heavy quarks effective theory.

Speaker: Mr Andreas Korn (London UC)

Slides PANIC_2014_Korn_v4.pdf

208 Latest results on Spectroscopy from LHCb

Decays of b-hadrons to light quarks allow spectroscopy measurements with a well defined initial state. The decay B(s)→J/ψππ gives insight on the quark content of the f0(500) and f0(980) mesons, while the decays B→pph and Λb→J/ψph allow for baryon spectroscopy. This talk also includes results on exotic charmonium resonances.

Speaker: Mr Antonio Augusto Alves Jr (Roma 1)

Slides talk_PANIC.pdf

Neutrinos and related astrophysical implications

Convener: Dr Kathrin Valerius (KCETA, Karlsruhe Institute of Technology)

209 Recent Results from MINERvA

MINERvA (Main INjector ExpeRiment for v-A) is a few-GeV neutrino nucleus scattering experiment at Fermilab using various nuclei as targets. The experiment provides measurements of neutrino and anti-neutrino cross sections off of nuclear targets which are important for neutrino oscillation experiments and the probing of the nuclear medium. Presented are recent results from MINERvA on quasi-elastic, inclusive charged-current neutrino scattering, and pion production processes.

Speaker: Dr Jonathan Miller (Universidad Tecnica Federico Santa Maria)

Slides MINERvA_NOW14PANIC14.pdf

210 The MicroBooNE Liquid Argon Time Projection Chamber Experiment at Fermilab

Liquid argon time projection chambers (LArTPC), due to their fine-grained tracking and calorimetric capabilities, provide an unprecedented amount of detail to study neutrino interactions in argon and are quickly becoming the desirable technology choice for future neutrino experiments. Various efforts are ongoing at Fermi National Accelerator Laboratory (Fermilab) to develop this intriguing technology. One of these efforts is the MicroBooNE experiment, a 170-ton LArTPC in its final stages of assembly and construction, scheduled to start taking data soon with Fermilab's Booster Neutrino Beam. In addition to addressing the low-energy electron-like excess observed by the MiniBooNE experiment, the exceptional particle-identification capability of MicroBooNE will make it possible for the first time to measure low-energy (~1 GeV) neutrino cross-sections as well as final-state interactions and other nuclear effects in neutrino interactions in argon with high precision. This talk will discuss the prospects of such measurements, give an overview of the reconstruction techniques used in LArTPC's and also give an overview of the experiments current status and other interesting physics goals.

Speaker: Mr Jonathan Asaadi (Syracuse University)

Slides MicroBooNE_PANIC2014_Asaadi.pdf

211 Constraining Neutrino Electromagnetic Properties by Atomic Ionization

With the advent of low-threshold detectors that look for neutrino scattering at sub-keV energy deposition, the sensitivity to possible neutrino electromagnetic moments can be further increased. As such low energies start to overlap with atomic scales, it is necessary to take atomic binding effects into account so that detector responses can be understood more reliably. In this talk, we present our recent study on the ionization of germanium by ab initio many-body calculations. Using recent results from the TEXONO Collaboration, we also report new limits on the magnetic moment and milli-charge of reactor antineutrinos.

Speaker: Mr Cheng-Pang Liu (National Dong Hwa University)

Slides PANIC2014_20140828.pdf

212 Non-relativistic Majorana neutrinos in a thermal bath and leptogenesis

Cosmology and particle physics come across a tight connection in the attempt to reproduce quantitatively the results of experimental findings. Indeed, the dark matter relic abundance and the amount of baryon asymmetry in the universe are accurately determined by the recent analysis of the cosmic microwave background. The Standard Model can not account for none of these evidences. Majorana fermions enter in many scenarios of physics beyond the Standard Model. In the simplest leptogenesis framework, Majorana neutrinos are at the origin of the baryon asymmetry. The non-relativistic regime comes up to be relevant during the lepton asymmetry generation. Moreover, all the interactions occur in a thermal medium, namely the universe in its early stage. We discuss the development of an effective field theory for non-relativistic Majorana particles to simplify calculations in a thermal medium. Then, we apply it to the case of a heavy Majorana neutrino decaying in a hot and dense plasma of Standard Model particles, whose temperature is much smaller than the mass of the Majorana neutrino but still much larger than the electroweak scale. Thermal corrections to the neutrino width and CP violating parameter are addressed. These techniques are analogous to those widely used for the investigation of heavy-ions collisions at LHC by exploiting hard probes. For instance, heavy quarkonia suppression and jet quenching are effects induced by an hot QCD medium. We show the similarities with the former case of Majorana neutrinos in medium. The development and application of resummation techniques in hot QCD or cosmology can benefit both fields.

Speaker: Mr Simone Biondini (Technische Universitaet Muenchen)

Slides Biondini.pdf

Quarks and gluons in hadrons, the hadron spectrum

Convener: Adam Gibson (Valparaiso University)

213 Production rates of hyperons and charmed baryons in e+e- collision at Belle

Inclusive baryon production in the jet events from e+e- collision was studied at ¥Upsilon(4S) energy by ARGUS and CLEO collaborations. The production rates divided by spin multiplicity showed a clear dependence on the exponential of baryon masses. Among them, ¥Lambda(1116) and ¥Lambda(1520) seemed to have higher production rates. Some theorists suggested diquark correlation in ¥Lambda may explain these phenomena, since ¥Lambda is spin-flavor singlet, and correlation between u and d quark is expected. However, the statistics and particle identification power were not sufficient to be conclusive. In addition, charmed baryons may contain stronger diquark component since color-spin interaction between the charm quark and light quarks is suppressed due to the heavy mass of charm quark. Thus it is interesting to measure production rates of charmed baryons. Recently, Belle experiment has collected huge number of baryon production with excellent particle identification. We have studied production rates of hyperons and charmed baryons using Belle data to confirm previous observation. In addition, we have performed the first systematic study of production rates of charmed baryons. We have observed very interesting features both for hyperons and charmed baryons. In this presentation, we'll report preliminary results of our analysis.

Speaker: Dr Masayuki Niiyama (Kyoto Univ.)

Slides panic2014_niiyama.pdf

214 Heavy flavour production with the ATLAS experiment

ATLAS has a wide programme to study the production cross section and decay properties of particles with beauty, as well as charmonium and bottomonium states. This presentation will cover ATLAS results in the domain of charmonium production, including J/psi, psi(2s) and chi_c states, B+ production, and updates on the D(*) meson cross-section analysis. The analyses discussed include double-differential production cross-section measurements of the J/psi, psi(2S) and P-wave charmonium states chi_cJ, extending upon previous measurements in precision and kinematic reach. Prompt and non-prompt modes are distinguished, as well as J/Psi vs Psi(2s) and the contribution to J/Psi production from chi_c feed-down. Alongside the latter analysis, a competitive measurement of the branching fraction B+/- -> chi_c1 + K+/- was also performed. Results of these measurements are compared with the latest theoretical predictions from a variety of theoretical approaches.

Speaker: Mr Roger Jones (Lancaster)

Slides PANICSept2014_v2.pptx

215 Associated vector boson plus prompt charmonium and di-charmonium production at the ATLAS experiment

We present evidence of associated vector boson+prompt J/psi production and measure its production rate. This is a key observable to further the understanding of quarkonium production mechanisms. We estimate the relative contributions to the signal from single and double parton scattering (DPS) and discuss possible implications of this novel final state for study of multiple parton interactions. We also review the cross-section measurement of double-J/psi production, separating the prompt-prompt, prompt-non-prompt and non-prompt di-J/psi production and estimating also the DPS contribution. Single parton scattering cross-sections are compared to cutting-edge theoretical calculations in the colour singlet and colour octet formalisms.

Speaker: Mr Soeren Prell (Iowa State)

Slides Prell-PANIC2014.pdf

216 Where is the mass in Q(E-C)D?

We present a comprehensive numerical study of dynamical mass generation for unquenched QED in four dimensions using the Schwinger-Dyson approach. We begin with an overview of previous critical studies performed in the quenched approximation, for which we add analysis using a new vertex, the Kizilersu-Pennington (KP) vertex, developed for unquenched studies. In these unquenched critical studies, we will present the fermion and boson propagators in the non-perturbative region and the measure the performance of the KP vertex. The dynamically generated fermion masses using a renormalized unquenched system of equations is compared for two hybrid model vertices.

Speaker: Dr A. Kizilersu (CSSM-University of Adelaide)

Slides Kizilersu_2014_v2.pptx

217 Diffractive and Exclusive measurements at CMS

Recent CMS measurements of diffractive and exclusive processes will be presented, based on p-p and p-Pb data from Run 1 of the LHC. These include measurements of single and double diffractive cross sections, photon-induced processes, and low-mass Central Exclusive Production. These results are compared to other measurements and to theoretical predictions implemented in various Monte Carlo simulations. Total inelastic cross section results will also be discussed, including the first measurements in p-Pb collisions at sqrt(s_NN) = 5.02TeV.

Speaker: Dr Sandro Fonseca de Souza (UERJ-CMS collaboration)

Slides PANIC2014_Exclusive_SFonseca_v5_final.pdf

218 Soft QCD measurements at LHCb

Its forward acceptance puts the LHCb in a unique position at the LHC to measure soft QCD phenomena at large rapidities and low transverse momenta. Recent results on charged particle multiplicity production, energy flow, and inclusive cross-sections are presented.

Speaker: Mr Alexandru Grecu (Bucharest)

Slides [small update]

Quarks and gluons in hadrons, the hadron spectrum

Convener: Dr Michel Guidal (Institut de Physique Nucleaire, Orsay)

219 Update on the OLYMPUS Two-Photon Exchange Experiment

OLYMPUS, an experiment designed to quantify the contribution of two-photon exchange to the proton form factor discrepancy, completed data taking in early 2013. About 4 fb-1 of data were collected, running with a 2.01 GeV stored lepton beam of alternating charge impinging on an internal hydrogen gas target. The analysis effort has progressed signicantly with data spanning an accepted kinematic range of (0.5 < Q2 < 2.2) (GeV/c)2. Meanwhile, a full Monte Carlo simulation now allows for integration of expected rates given variable cuts while accounting for time-dependent backgrounds and detector effects. This talk will review the current status and prospects.

Speaker: Prof. Norair Akopov (Alikhanyan National Science Laboratory (Yerevan Physics Institute))

Slides panic2014-norik3i.pdf

220 Measuring Luminosity at OLYMPUS

The OLYMPUS experiment seeks to provide a high-precision measurement (<1% error) of the positron-proton versus electron-proton elastic scattering cross section ratio. This requires fine control of all systematic uncertainties, including the calculation of the luminosity. For this purpose, multiple independent subsystems were operated alongside the main spectrometer during data taking to allow for empirical determination of the luminosity as a function of time. An approximate value is computed based on parameters of the lepton beam and gaseous target, while small-angle elastic scatters of known cross section are counted by two sets of ionization-based detector systems. The most precise value comes from counting coincidences of high-rate (pure QED) lepton-lepton scatters using a pair of calorimetric lead fluoride Cherenkov detectors.

Speaker: Mr Dmitry Khaneft (Johannes Gutenberg-Universität, Mainz, Germany)

Slides 2014.08.28_dkhaneft.pdf

221 The muonic hydrogen Lamb shift and proton radius from effective field theories

We obtain a model independent expression for the muonic hydrogen Lamb shift. The hadronic effects are controlled by the chiral theory, which allows for their model independent determination. We give their complete expression including the pion and Delta particles. Out of this analysis and the experimental measurement of the muonic hydrogen Lamb shift we determine the electromagnetic proton radius: $r_p=0.8432(16)$ fm. This number is at 6.4$\sigma$ variance with respect to the CODATA value. The parametric control of the uncertainties allows us to obtain a model independent determination of the error, which is dominated by hadronic effects.

Speaker: Mr Pineda Antonio (Universitat Autonoma de Barcelona)

Slides PANIC14.pdf

222 Elastic Electron and Muon Scattering Experiment Off the Proton at PSI

While consistent results for the charge radius of the proton have been extracted from elastic electron-scattering data and through the spectroscopy of atomic hydrogen, recent high-precision studies of muonic hydrogen found notably smaller values for the charge radius. This so-called proton-radius puzzle raises questions ranging from experimental and methodological issues to physics beyond the standard model. The puzzle certainly calls for new measurements. The MUon proton Scattering Experiment (MUSE) at the Paul Scherrer Institute is being developed to provide elastic scattering data off the proton with electron- and muon beams of positive and negative charge. Each of the four sets of data will allow the extraction of the proton charge radius; in combination, the data test possible differences of the electron and muon interactions and additionally two-photon exchange effects. The experiment will cover a four-momentum-transfer range from 0.002 to 0.08 GeV^2. An overview of the proposed experiment will be presented.

Speaker: Mr Steffen Strauch (University of South Carolina)

Slides Panic_2014_Strauch.pdf

223 Study of hadron properties at PANDA

PANDA (anti-Proton ANnihilations at DArmstadt) is a next generation hadron physics experiment to be operated at the future Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany. It will use intense cooled antiproton beams with a momentum between 1.5 GeV/c and 15 GeV/c. The PANDA detector is a state-of-the-art internal target detector allowing the detection and identification of neutral and charged particles almost in the whole solid angle. One of the major goals of the PANDA experiment is the comprehensive study of hadron properties in the annihilation process. The PANDA experiment will provide the unique possibility to measure properties of hadrons precisely, including charmonium, glueballs, and exotic states. Charmonium states with different quantum numbers can be produced durectly. PANDA will measure with high precision the parameters of the resonances in formation mode, making use of the excellent momentum resolution Δp/p=10^{−4}-10^{−5} of the HESR beam. The PANDA experiment will also give the opportunity to study hyperon production, including spin properties and CP violation in the decays. The production of hyperon pairs in the same event in the annihilation process help to reduce the systematic errors. Nucleon Structure will be also studied from electromagnetic processes. The determination of the moduli of electric G_E and magnetic G_M form factors in the time-like domain is for example one of the important targets of the PANDA experiment.

Speaker: Dr Vasily Mochalov (IHEP, Protvino, Russia)

Slides panic_mochalov.pptx

224 Physics opportunities in electron-hadron collisions at the future eRHIC

Our understanding of the structure of nucleons is described by the properties and dynamics of quarks and gluons in the theory of quantum chromodynamics. With advancements in theory and the development of phenomenological tools we are preparing for the next step in subnuclear tomographic imaging at a future electron-ion collider. A large range of center-of-mass energies ($\sqrt{s}\approx 77 - 141$ GeV) in combination with extremely high luminosities $(\sim10^{33}$ cm$^{-2}$s$^{-2})$ will open a unique opportunity for very high precision measurements, allowing for a detailed investigation of the proton and nuclear hadronic substructure in multi-dimensions. In addition, highly polarized nucleon ($P\approx 70\%$) and electron ($P\approx 80\%$) beams can probe the parton polarizations in previously unexplored kinematic regions and with unprecedented accuracy, as well as address the role of orbital angular momentum with respect to the nucleon spin. This talk will summarize the eRHIC physics case for electron-proton collisions, the expected impact over the current knowlege and some of the technical challenges of such a versatile experimental endeavor.

Speaker: Dr Salvatore Fazio (Brookhaven National Laboratory)

Slides Fazio_EIC_ep_anim.pdf Fazio_EIC_ep_v3.pptx

Quarks and gluons in hot and dense matter

Convener: Ralf Ulrich (Karlsruhe Institute of Technology)

225 Soft probes of the quark gluon plasma in ATLAS

Measurements of low-pT (< 5 GeV) particle production have provided valuable insight on the production and evolution of the quark-gluon plasma in Pb+Pb collisions at the LHC. In particular, measurements of elliptic and higher order collective flow imprinted on the azimuthal angle distributions of low-pT particles directly probe the strongly-coupled dynamics of the quark gluon plasma and test hydrodynamic model descriptions of its evolution. The large acceptance of detectors like ATLAS have made it possible to measure flow event-by-event and to determine the correlations between different harmonics. Recent measurements of low-pT particle production and multi-particle correlations in proton-lead collisions have shown features similar to the collective flow observed in Pb+Pb collisions. Results will be presented from a variety of single and multi-particle measurements in Pb+Pb and proton-Pb collisions that probe the collective dynamics of the quark gluon plasma and possibly provide evidence for collectivity in even small systems.

Speaker: Mr Krzysztof Wozniak (Cracow)

Slides kw_panic2014.pdf

226 Transverse momentum distributions of charged particles and identified hadrons in p-Pb collisions at the LHC

The transverse momentum distributions (pT) of charged particles and identied hadrons in p-Pb collisions at sqrt(sNN) = 5.02 TeV have been measured by ALICE at the LHC. Charged-particle tracks are reconstructed at mid-rapidity over a large momentum range 0.15 < pT < 50 GeV/c. Light-flavoured hadrons and resonances are identied in the various momentum ranges from 0.15 GeV/c up to 15 GeV/c by using specic energy loss (dE/dx), time-of-flight, topological particle-identication and invariant-mass reconstruction techniques. pT spectra are measured in the charged particle multiplicity intervals. Results from p{Pb collisions will be presented and compared with pp and Pb-Pb results and confronted with theoretical models.

Speaker: Jacek Otwinowski (The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Science)

Slides Panic2014_JacekOtwinowski_v4.pdf

227 Light (Hyper-)Nuclei production at the LHC with ALICE

Thanks to its excellent particle identification and momentum measurement capabilities, the ALICE detector allows for the identification of deuterons, tritons, $\rm ^{3}{He}$ and $\rm ^{4}{He}$ and and their corresponding antinuclei. This is achieved via their specific energy loss in the Time Projection Chamber and the velocity measurement by the Time-Of-Flight detector. Moreover, thanks to the Inner Tracking System capability to separate primary from secondary vertices, it is possible to identify (anti-)hypertritons exploiting their mesonic decay ($\rm ^{3}_{\Lambda}{H}$ $\rightarrow$ $^{3}\rm{He}$ + $\pi^-$). Results on the production yields of light nuclei and anti-nuclei in Pb--Pb, pp and p--Pb will be presented, together with the measurement of hypertriton production rates in Pb--Pb. The measurement of the hypertriton lifetime will also be shown. The experimental results will be compared with the predictions of both thermal (statistical) and coalescence models.

Speaker: Ramona Lea (University and INFN Trieste)

Slides Panic2014_RamonaLea.pdf

228 Search for Muonic Atoms at RHIC

In ultrarelativistic heavy-ion collisions with high particle multiplicities, a produced muon can be bound to a charged hadron (proton, antiproton, $K^{+}$, $K^{-}$, $\pi^{+}$, $\pi^{-}$) by Coulomb force and form a hydrogen-like atom. Among these atoms, the antimatter muonic hydrogen and the $K-\mu$ atom have been predicted but not yet been discovered. At the STAR experiment, muon identification at low transverse momentum provides a great opportunity to search for a variety of muonic atoms. Muonic atoms are an ideal tool, as suggested by Mel Schwartz, Jack Sandweiss and many other theorists, to determine the thermal emission from the Quark-Gluon Plasma via a direct measurement of the single muon spectrum because only thermal muons or muons from short-lived resonance decays are capable of forming such atoms. We will present the analysis on the $\sqrt{s_{NN}}=200$ GeV Au+Au collisions collected by the STAR experiment at RHIC. We will show the possible signatures of the new muonic atoms extracted from invariant mass distributions and also from particle correlations. We will also show the procedure that we use to extract the fraction of primordial muons.

Speaker: Mr Kefeng Xin (Rice University)

Slides kxin_muonic_hamburg_PANIC.pdf

229 Recent Highlights from the PHENIX Heavy-Ion Program at RHIC

Over the last decade it has been established that a quark-gluon plasma (QGP) is formed in ultrarelativistic A+A collisions at RHIC energies. In recent years, detector upgrades have enabled the detailed study of this hot and dense matter. Although the RHIC d+Au program was originally undertaken to study initial state and cold nuclear matter effects, recent measurements at both RHIC (d+Au) and the LHC (p+Pb) have found evidence for collective phenomena in these small systems. We present the latest measurements from the PHENIX experiment. The talk will include recent results on electromagnetic probes that allow to constrain the time evolution of the medium. We will present the system size dependence on correlation observables from d+Au towards Au+Au collisions. The latest quarkonia and heavy-flavor results from PHENIX will be discussed. Data from the RHIC beam-energy scan that can give insight into the nuclear equation of state will be shown. Finally, we will present future plans and upgrades of the PHENIX detector.

Speaker: Dr Baldo Sahlmueller (Muenster)

Slides sahlmueller_phenix_overview.pdf

Standard model physics at the TeV scale

Convener: Mr Rainer Mankel (DESY)

230 Recent QCD results from ATLAS

The ATLAS collaboration has performed studies of a wide range of QCD phenomena, from soft particle to hard photon and jet production. Recent soft≠QCD measurements include studies of underlying event, vector meson production and quark confinement effects. Differential measurements of inclusive and multi≠jet production provide stringent tests of high≠order QCD predictions and provide input for determination of parton density functions. Measurements of isolated inclusive and di≠photons cross sections for high p_T photons test various theoretical predictions and constrain parton density functions. In addition the total p≠p cross section at 7 TeV, together with the elastic and inelastic contributions, is measured and compared to various models. An overview of these results is given.

Speaker: Mr Zenis Tibor (Bratislava)

Slides QCD_ATLAS_Zenis.pdf

231 Recent electroweak results from ATLAS

ATLAS measurements of multi≠boson production processes involving combinations of W, Z and isolated photons are summarized. Production processes sensitive to vector≠boson fusion and vector≠boson scattering such as electroweak production of single vector boson associated with two forward jets and the di≠boson production at 8 TeV p≠p collisions are also presented and compared to Standard Model expectations. A measurement of the cross section and branching ratio for Z≠> 4leptons are presented and are found consistent with the expectation from the Standard Model. Measurements of Standard Model parameters are performed with high precision by ATLAS, such as the weak mixing angle, and are compared to world averages.

Speaker: Mr Jochen Meyer (CERN)

Slides PANIC2014_ATLAS-EW-Results.pdf

232 Measurements of WV Boson Production and limits on charged aTGC at CMS

We provide a summary of the latest measurements of the WV production cross- sections, where V=W or Z. The data sample(s) correspond to proton-proton collision events collected with the CMS detector at the center of mass energy of 7 and 8 TeV. Subsequent searches for Anomalous Triple Gauge Couplings, which allow us to probe the non-Abelian structure in the Electroweak Sector, and corresponding exclusion limits are presented.

Speaker: Mr Ilya Osipenkov (Texas A&M Univ.)

Slides WVInteractions_PANIC2014.pdf

233 HERAFitter - open source QCD Fit framework and its related studies

We present the HERAFitter project which provides a framework for Quantum Chromodynamics (QCD) analyses related to the proton structure in the context of multi-processes and multi-experiments. Based on the concept of factorisable nature of the cross sections into universal parton distribution functions (PDFs) and process dependent partonic scattering cross sections, HERAFitter allows determination of PDFs from the various hard scattering measurements. Here we report a set of parton distribution functions determined with the HERAFitter program using HERA data and preserving correlations between uncertainties for the LO, NLO and NNLO sets. The sets are used to study uncertainties for ratios of cross sections at LHC calculated at different order in QCD. A reduction of overall theoretical uncertainty is observed in this case.

Speaker: Mr Volodymyr Myronenko (DESY)

Slides PANIC_HF_project_V_Myronenko.pdf

234 Electroweak physics at LHCb

The LHCb forward acceptance covers a range of rapidities not accessible by the other LHC experiments, allowing for complementary measurements. We report recent measurements of electroweak boson production, either inclusive, or in association with a jet or a D meson.

Speaker: Ms Mueller Katharina (Universität Zürich)

Slides km_panic_v2.pdf

String theory

Convener: Dr Rutger Boels (II. institut für theoretische physik)

235 Ambitwistor String Theory

I will describe a chiral infinite tension limit of the RNS superstring, known as ambitwistor string theory, which provides a powerful point of view on tree-level Yang-Mills and gravity amplitudes in arbitrary dimensions. In four dimensions, ambitwistor string theory gives rise to new formulae for tree-level Yang-Mills and gravity amplitudes with arbitrary amounts of supersymmetry, which are supported on the scattering equations and are much simpler than previous formulae. Ambitwsitor string theory also provides new insights into soft theorems for photons and gravitons and their relationship to extended BMS symmetries.

Speaker: Dr Arthur Lipstein (University of Oxford)

Slides panic.pdf

236 Quantum-critical point of 1+1-dimensional adjoint QCD

In this talk I will discuss 1+1-dimensional QCD with fermions in the adjoint representation. In the high density regime, the infrared physics of this theory is described by a constrained free fermion theory with an emergent N=(2,2) superconformal symmetry. I will discuss the partition function and the search for chiral primaries in this model. In view of the construction of a holographic dual, I will also discuss the chiral ring of chiral primary fields at large N.

Speaker: Mr Ingo Kirsch (DESY)

237 Why does black hole describe the deconfinement phase?

In the gauge/gravity duality, the deconfinement transition in the gauge theory is identified with a formation of black hole in the dual gravity theory. By assuming this correspondence, many predictions on QGP have been made. In this talk, we justify this approach quantitatively, and also provide intuitive understanding. Firstly we give quantitative evidence for this identification from the thermodynamic study of the supersymmetric theory. We show that black hole and Yang-Mills theory give the same answer, even at finite temperature, including the 1/N correction. Then we consider generic gauge theories, including QCD, and show that the deconfinement transition is the condensation of very long and self-intersecting QCD strings, which is analogous to the formation of a black hole in string theory. We provide a concrete picture by using lattice gauge theory and matrix models in the Hamiltonian formulation, and give numerical evidence supporting this interpretation. We also argue how the fast thermalization of the QGP can be understood from this viewpoint. This talk is based on the following work: Hanada, Hyakutake, Ishiki and Nishimura, Science (2014)[arxiv:1311.5607]. Hanada, Maltz and Susskind, arxiv:1405.1732[hep-th].

Speaker: Prof. Masanori Hanada (Kyoto U., Stanford U.)

Slides 2014Aug28_PANIC_DESY.pdf

Tests of symmetries and conservation laws

Convener: Prof. Krishna Kumar (University of Massachusetts, Amherst)

238 Experimental search for an electric dipole moment of the neutron

Experimental search for an electric dipole moment of the neutron The existence of a permanent non-zero electric dipole moment of the neutron (nEDM) would be unambiguous evidence for a violation of time reversal symmetry (T). The Standard Model (SM) contribution to the nEDM is of order 10^(-32) e*cm while the current experimental limit is dn < 2.9 * 10^(-26) e*cm. The search for an nEDM is one of the most sensitive experiments searching for physics beyond the SM (BSM) and any improvement of the current experimental limit will constrain BSM models. There are many efforts worldwide to search for an nEDM with high sensitivity; I will present the ongoing nEDM experiment at Paul Scherrer Institut (Switzerland) in which the Ramsey technique of separated oscillatory fields is applied to the stored ultracold neutrons with the potential to observe or rule out an nEDM at the level of 10^(-27) e*cm in the coming years.

Speaker: Dr Malgorzata Kasprzak (University of Fribourg)

Slides nEDM_PANIC2014_MK.pdf

239 Measurements of Electric Dipole Moments of Charged Particles at Storage Rings

Electric Dipole Moments (EDM) of elementary particles are considered to be one of the most powerful tools to investigate CP violation beyond the Standard Model and to find an explanation for the dominance of matter over anti-matter in our Universe. Up to now experiments concentrated on neutral systems (neutrons, atoms, molecules). Storage rings offer the possibility to measure EDMs of charged particles by observing the influence of the EDM on the spin motion. The Cooler Synchrotron COSY at the Forschungszentrum Jülich provides polarized protons and deuterons up to a momentum of 3.7 GeV/c and is thus an ideal starting point for such an experimental program. The JEDI (Jülich Electric Dipole moment Investigations) Collaboration has been formed to exploit the COSY facility to demonstrate the feasibility of such a measurement and to perform all the necessary investigations towards the design of a dedicated storage ring. The plans for measurements of charged hadron EDMs at COSY and results of the first test measurements will be presented.

Speaker: Dr Volker Hejny (Institut für Kernphysik, Forschungszentrum Jülich)

240 Searches for the Electric Dipole Moment of the Neutron: An Experimental Overview

The existence of a permanent electric dipole moment (EDM) in any non-degenerate system would affirm the presence of Time and (Charge Conjugation-)Parity Violation in fundamental interactions. The discovery of a non-zero EDM in next-generation experiments may point to an explanation of the numerical size of the baryon asymmetry of the Universe. Worldwide multiple ongoing efforts are trying to improve the present limit on the EDM of the neutron by two orders of magnitude. The utilization of ultra-cold neutrons and advances in co-magnetometry hold promise for an improvement in sensitivity to $\approx 5 \times 10^{-28} e\cdot$cm. Such a new limit would pose additional stringent constraints on physics beyond the Standard Model. An overview of currently planned experiments and of the projected results will be presented.

Speaker: Mr Wolfgang Korsch (University of Kentucky)

Slides PANIC14_korsch.pdf

241 New Limit on Lorentz-Invariance- and CPT-Violating Neutron Spin Interactions Using a Free-Spin-Precession 3He-129Xe Comagnetometer

We performed a search for a Lorentz-invariance- and CPT-violating coupling of the 3He and 129Xe nuclear spins (each largely determined by a valence neutron) to posited background tensor fields that permeate the Universe. Our experimental approach is to measure the free precession of nuclear spin polarized 3He and 129Xe atoms in a homogeneous magnetic guiding field of about 400 nT using LTC SQUIDs as low-noise magnetic flux detectors. As the laboratory reference frame rotates with respect to distant stars, we look for a sidereal modulation of the Larmor frequencies of the co-located spin samples. As a result we obtain an upper limit on the equatorial component of the background field interacting with the spin of the bound neutron bn< 8.4 * 10^-34 GeV (68% C.L.). Our result improves our previous limit by a factor of 30 and the world's best limit by a factor of 4. In the talk we will give an overview of the principle of measurement, data evaluation and results. Finally, estimations based on current data regarding the sensitivity of future measurements testing CP symmetry (Xe-EDM) will be presented.

Speaker: Mr Fabian Allmendinger (Physikalisches Institut, Universität Heidelberg)

242 Limits for Spin-Dependent Short-Range Interaction of Axion-Like Particles

A possible solution to the strong CP problem is a light pseudoscalar boson, the so-called axion. The axion would cause a new spin-dependent short-range interaction. Of interest here is the search for an axion mediated short range interaction between a fermion and the spin of another fermion. To search for this effect, co-located, nuclear spin polarized 3He and 129Xe gas is used to become independent of magnetic field drifts. The new approach is to measure the free nuclear spin precession frequencies in a homogeneous magnetic guiding field of about 350 nT using LTc SQUID detectors. The whole setup is housed in a magnetically shielded room at the Physikalisch Technische Bundesanstalt (PTB) in Berlin. With this setup long nuclear-spin coherence times of several hours for both gases can be achieved. In this talk we present results which improve the present upper limits on the scalar-pseudoscalar coupling of axion-like particles in the axion-mass window from 10^(-2) eV to 10^(-6) eV by up to four orders of magnitude [1]. [1] K. Tullney et al., Phys. Rev. Lett. 111, 100801 (2013).

Speaker: Dr Kathlynne Tullney (Institute of physics, Johannes-Gutenberg University Mainz)

Slides TULLNEY_PANIC_2014_BackupSlides.pdf TULLNEY_PANIC_2014.pdf

Conference Dinner

Friday, 29 August

08:30 Registration (until 13:00)

Plenary

Convener: Johannes Haller (University Hamburg)

243 Poster awards and short presentations

Speaker: Dr Thomas Schoerner-Sadenius (DESY)

Photos

• all.jpg
• M.Seidel.jpg
• S.Okada.jpg
• V.Kovalenko.jpg

Slides

• poster_1_presentation_Okada
• poster_2_presentation_Kovalenko.pdf
• poster_2_presentation_Seidel

244 Generic detector research and developments for future experiments

Speaker: Dr Ties Behnke (DESY)

Slides Generic_Detector_Developments.pdf Generic_Detector_Developments.pptx

10:20 Coffee Break

Plenary

Convener: Joachim Mnich (DESY)

245 Hypernuclei

Speaker: Prof. Hirokazu Tamura

Slides PANIC2014_tamura2.ppt

246 Conference closeout

Slides Closeout-140829.pdf

12:30 Lunch Break

14:00 Visit to DESY and XFEL

The bus leaves from the University by 13:30