Conveners
Quarks and gluons in hadrons, the hadron spectrum
- Michel Guidal (Institut de Physique Nucleaire, Orsay)
Quarks and gluons in hadrons, the hadron spectrum
- Michel Guidal (Institut de Physique Nucleaire, Orsay)
Quarks and gluons in hadrons, the hadron spectrum
- Nicole D'Hose (CEA Saclay)
Quarks and gluons in hadrons, the hadron spectrum
- Nicole D'Hose (CEA Saclay)
Quarks and gluons in hadrons, the hadron spectrum
- Michel Guidal (Institut de Physique Nucleaire, Orsay)
Quarks and gluons in hadrons, the hadron spectrum
- Michel Guidal (Institut de Physique Nucleaire, Orsay)
Quarks and gluons in hadrons, the hadron spectrum
- Adam Gibson (Valparaiso University)
Dr
Ming Liu
(Los Alamos National Lab)
25/08/2014, 14:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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)...
Dr
James Drachenberg
(Valparaiso University)
25/08/2014, 14:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Salvatore Fazio
(Brookhaven National Laboratory)
25/08/2014, 14:40
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mrs
Márcia Quaresma
(LIP - Lisbon)
25/08/2014, 15:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Jan Matousek
(Charles University in Prague)
25/08/2014, 15:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Markus Diefenthaler
(University of Illinois at Urbana-Champaign)
25/08/2014, 15:40
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Ami Rostomyan
(DESY)
25/08/2014, 16:30
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Nour Makke
(INFN/University of Trieste & ICTP)
25/08/2014, 16:50
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Carl Gagliardi
(Texas A&M University)
25/08/2014, 17:10
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Adam Gibson
(Valparaiso University)
25/08/2014, 17:30
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Hiroki MATSUDA
(Yamagata University)
25/08/2014, 17:50
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Maxime DEFURNE
(CEA)
26/08/2014, 14:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Sergey Yashchenko
(DESY)
26/08/2014, 14:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Eric Fuchey
(CEA Saclay)
26/08/2014, 14:40
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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....
Prof.
Michel Guidal
(Orsay)
26/08/2014, 15:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Julie Roche
(Ohio University)
26/08/2014, 15:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mrs
Marie Boer
(Institut de Physique Nucleaire d'Orsay)
26/08/2014, 15:40
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
William Levine
(Carnegie Mellon University)
28/08/2014, 14:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Sebastian Uhl
(Technische Universität München)
28/08/2014, 14:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Manuel Dieterle
(Department of Physics, University of Basel)
28/08/2014, 14:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Karin Schoenning
(Dept. of Physics and Astronomy, Uppsala University, and CERN)
28/08/2014, 14:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
169.
Helicity Dependent Cross Sections in $\eta$ Photoproduction off Quasi-Free Protons and Neutrons
Ms
Lilian Witthauer
(Department of Physics, University of Basel)
28/08/2014, 14:40
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Igor Katchaev
(Institute for High Energy Physics, Protvino, Russia)
28/08/2014, 14:40
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Prof.
Takashi Inoue
(Nihon University, College of Bioresource Sciences)
28/08/2014, 15:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Thomas Strub
(University of Basel)
28/08/2014, 15:00
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Prof.
Aparajita Bhattacharya
(Jadavpur University)
28/08/2014, 15:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
see submitted pdf file
Ms
Li Balkestahl
(Uppsala University)
28/08/2014, 15:20
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Will Levine
(Carnegie Mellon University)
28/08/2014, 15:40
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Masayuki Niiyama
(Kyoto Univ.)
28/08/2014, 16:30
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Prof.
Norair Akopov
(Alikhanyan National Science Laboratory (Yerevan Physics Institute))
28/08/2014, 16:30
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Roger Jones
(Lancaster)
28/08/2014, 16:50
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Dmitry Khaneft
(Johannes Gutenberg-Universität, Mainz, Germany)
28/08/2014, 16:50
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Soeren Prell
(Iowa State)
28/08/2014, 17:10
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Pineda Antonio
(Universitat Autonoma de Barcelona)
28/08/2014, 17:10
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Mr
Steffen Strauch
(University of South Carolina)
28/08/2014, 17:30
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
A. Kizilersu
(CSSM-University of Adelaide)
28/08/2014, 17:30
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Sandro Fonseca de Souza
(UERJ-CMS collaboration)
28/08/2014, 17:50
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Vasily Mochalov
(IHEP, Protvino, Russia)
28/08/2014, 17:50
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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...
Dr
Salvatore Fazio
(Brookhaven National Laboratory)
28/08/2014, 18:10
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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 -...
Mr
Alexandru Grecu
(Bucharest)
28/08/2014, 18:10
2) Quarks and gluons in hadrons, the hadron spectrum
Talk
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.