25-28 September 2012
DESY Hamburg
Europe/Berlin timezone
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Contribution List

Displaying 107 contributions out of 107
We consider the most general CP-conserving renormalizable effective scalar potential involving two doublets plus one singlet Higgs and satisfying the electroweak gauge symmetry. After deriving the electroweak-symmetry breaking conditions, we focus our attention on specific cases, characterized by specific symmetry properties and/or relations to supersymmetry-inspired extensions of the Standard Mod ... More
Presented by Dr. Guillaume CHALONS on 27 Sep 2012 at 2:00 PM
We confront the discovery of a boson decaying to two photons, as reported recently by ATLAS and CMS, with the corresponding predictions in the Minimal Supersymmetric Standard Model (MSSM) and the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We show that a Higgs with a mass around 125 GeV and a significant enhancement of the rate in the two photon channel, compatible with the observed sig ... More
Presented by Lisa ZEUNE on 27 Sep 2012 at 6:20 PM
The ``narrow-width approximation'' is a convenient tool for the factorisation of a more complicated process into production and subsequent decay of a particle with a small width compared to its mass. However, this approximation cannot be applied in the case of sizable interferences between propagator contributions of different particles that are close to their mass shell. The spectrum of the MSSM ... More
Presented by Elina FUCHS on 27 Sep 2012 at 4:10 PM
The associated production of a Higgs boson and one of the weak gauge bosons W or Z at hadron colliders can be understood mainly as the Drell-Yan production of a virtual vector boson, which subsequently radiates a Higgs. QCD corrections affect only the Drell-Yan part and are known through NNLO (alpha_S^2), leading to a small remaining dependence on the renormalization and factorization scale for th ... More
Presented by Tom ZIRKE on 26 Sep 2012 at 2:00 PM
In this talk I will present GoSam, a public package to compute one-loop corrections within and beyond the Standard Model. I will discuss how to use this package as well as phenomenological aspects and recent developments.
Presented by Mr. Nicolas GREINER on 26 Sep 2012 at 4:50 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
We calculate the rate for thermal production of axions and saxions via scattering of quarks, gluons, squarks, and gluinos in the primordial supersymmetric plasma. Systematic field theoretical methods such as hard thermal loop resummation are applied to obtain a finite result in a gauge-invariant way that is consistent to leading order in the strong gauge coupling. We calculate the thermally produc ... More
Presented by Mr. Peter GRAF on 27 Sep 2012 at 6:40 PM
Presented by M. LINDNER on 28 Sep 2012 at 9:00 AM
In this talk I will argue that the strongly coupled quark-gluon plasma formed at LHC and RHIC can be considered as a chiral superfluid. The 'normal' component of the fluid is the thermalized matter in common sense, while the 'superfluid' part consists of long wavelength (chiral) fermionic states moving independently. I use several nonperturbative techniques to demonstrate that. First, I analyze th ... More
Presented by Tigran KALAYDZHYAN on 27 Sep 2012 at 6:20 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
Over the last years both cosmic-ray antiproton measurements and direct dark matter searches have proved particularly effective in constraining the nature of dark matter candidates. The present work focusses on these two types of constraints in a minimal framework which features a Majorana fermion as the dark matter particle and a scalar that mediates the coupling to quarks. We derive antiproton an ... More
Presented by Mr. Stefan VOGL on 26 Sep 2012 at 2:40 PM
ATLAS and CMS collaborations have searched for multi-jet plus large missing energy signatures and their null results have put a stringent constraint on the CMSSM parameter space. Such "vanilla" supersymmetry with squark/gluino mass below 1-1.4 TeV have already excluded. However in some scenarios, for example split generation, compressed SUSY and R-parity violation scenarios, low energy supersymm ... More
Presented by Dr. Kazuki SAKURAI on 27 Sep 2012 at 3:50 PM
Models with a universal extra dimension (UED), in which all Standard Model fields propagate, predict a rich LHC phenomenology at the TeV scale. We present bounds on the minimal UED, split UED, and non-minimal UED models from the data taken in the first phase of the LHC. We compare our results with existing bounds from flavor physics and electroweak precision tests, thereby showing how much current ... More
Presented by Dr. Thomas FLACKE on 27 Sep 2012 at 5:40 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
We study a theory of dilaton gravity in a 5D brane scenario, with dilaton non-minimally coupled to the matter content of the universe localized on the brane. We investigate whether the observed large-scale structure of the universe can exist on the brane in the effective 4D dilaton gravity scenario with an exact anti de Sitter bulk. The corresponding constraint on the spatial derivative of the mat ... More
Presented by Dr. Dominika KONIKOWSKA on 27 Sep 2012 at 5:40 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
D-branes on Calabi-Yau manifolds can be described by matrix factorizations at the Landau-Ginzburg (LG) point. In this talk I will discuss methods for the study of D-brane moduli spaces and superpotentials within this framework. An emphasis will be put on non-toric complex structure deformations, which arise as bulk moduli from twisted sectors in the LG orbifold. I will outline how the contribution ... More
Presented by Mr. Daniel PLENCNER on 27 Sep 2012 at 6:40 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
The observation of a sharp spectral feature in the gamma-ray sky would be one of the cleanest ways to identify dark matter and pinpoint its properties. Over the years a lot of attention has been paid to two specific features, namely gamma-ray lines and internal bremsstrahlung. Here, we explore a third class of spectral signatures, box-shaped gamma-ray spectra, that naturally arise in dark matter c ... More
Presented by Mr. Sergio LOPEZ GEHLER on 26 Sep 2012 at 2:20 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
Dark matter searches are entering a particularly exciting phase where the complementarity between different signals may finally be explored. This situation calls for a more accurate description of the dark matter distribution in our Galaxy. In this context, I will show that gravitational microlensing and dynamical observables can be combined to set interesting constraints on the dark matter local ... More
Presented by Miguel PATO on 26 Sep 2012 at 4:50 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
Current CMB observations could confirm an increase of the effective neutrino degrees of freedom at photon decoupling. We show that, if the gravitino problem is solved by a light axino, dark (decoupled) radiation emerges naturally after nucleosynthesis but before CMB times leading to a new upper bound on the reheating temperature < 10^10 GeV. In turn, successful thermal leptogenesis predicts such a ... More
Presented by Dr. Jasper HASENKAMP on 27 Sep 2012 at 6:20 PM
Presented by T. VOLANSKY on 28 Sep 2012 at 9:35 AM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
We consider the possibility that the primordial curvature perturbation was generated through the curvaton mechanism from a scalar field with an electric charge, or precisely the Standard Model U(1) weak hypercharge. This links the dynamics of the very early universe concretely to the Standard Model of particle physics, and because the coupling strength is known, it reduces the number of free param ... More
Presented by Dr. Rose LERNER on 27 Sep 2012 at 6:00 PM
Presented by A. POMAROL on 25 Sep 2012 at 5:05 PM
Presented by D. WACKEROTH on 26 Sep 2012 at 12:25 PM
Form factors for hadronic transitions are a leading error source in the theoretical estimate of observables whose experimental measurements might eventually uncover BSM physics. Two theoretical approaches, depending on the kinematic region, for the determination of hadronic form factors are available, namely LCSR and Lattice QCD. We extract ratios of $B \to K^*$ form factors at low hadronic re ... More
Presented by Christian HAMBROCK on 26 Sep 2012 at 2:00 PM
Presented by G. ISIDORI on 27 Sep 2012 at 12:25 PM
As experimental evidence for a Higgs boson with a mass around 125 GeV is mounting, the question whether its couplings are Standard Model-like is becoming more and more important. Deviations from the Standard Model predictions could for example point to the existence of secondary mechanism of electroweak symmetry breaking such as additional Higgs doublets, or to other types of new physics not too ... More
Presented by Joachim KOPP on 27 Sep 2012 at 3:00 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Form factors are very interesting observables to consider. For example, it has been shown that the two-loop form factor in N=4 SYM is equal to the leading transcendental part of a Higgs scattering amplitude in QCD. In this talk we report some progress on computing form factors in N=4 SYM at strong coupling based on AdS/CFT duality.
Presented by Dr. Gang YANG on 27 Sep 2012 at 6:00 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
In this talk I will introduce a unified picture of Dirac neutrino masses, baryon asymmetry and dark matter relic density. Specifically, we consider an $SU(3)'_c\times SU(2)'_L\times U(1)'_Y$ dark sector, parallel to the $SU(3)_c\times SU(2)_L\times U(1)_Y$ ordinary sector. The hypercharges, baryon numbers and lepton numbers in the dark sector are opposite to those in the ordinary sector. We ... More
Presented by Dr. Peihong GU on 27 Sep 2012 at 3:00 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
D6-brane models provide a geometrically intuitive picture for string model building. Rigid D-branes on orbifolds with discrete torsion are of particular interest due to the absence of (some) moduli on the one hand and the power of CFT tools on the other hand. In this talk, recent progress on constructing the Standard and GUT Models in such D-brane scenarios will be presented.
Presented by Prof. Gabriele HONECKER on 27 Sep 2012 at 2:00 PM
Presented by Bryan WEBBER on 26 Sep 2012 at 5:30 PM
Presented by T. GERSHON on 27 Sep 2012 at 11:15 AM
The couplings of the low scale type I See-Saw model are severely constrained by the requirement of reproducing the correct neutrino mass and mixing parameters, by the non-observation of lepton number and charged lepton flavour violating processes and by electroweak precision data. We show that all these constraints still allow for the possibility of an exotic Higgs decay channel into a light neutr ... More
Presented by Mr. Camilo A. GARCIA CELY on 27 Sep 2012 at 2:20 PM
A powerful method to constrain the parameter space of theories beyond the Standard Model is to compare the predicted dark matter relic density with data from cosmological precision measurements, in particular from the WMAP and in future also from the PLANCK satellite. On the particle physics side, the main uncertainty in the relic density calculation arises from the (co-)annihilation cross sectio ... More
Presented by Julia HARZ on 26 Sep 2012 at 3:00 PM
In this talk I present results of a global analysis of electroweak precision data and Higgs signal strengths in the context of the Standard Model with three and four fermion generations. I re-examine the SM electroweak fit with the new input on the Higgs mass and discuss the effect of a fourth fermion generation on the Higgs signal strengths. To quantify the level at which a fourth fermion gener ... More
Presented by Dr. Martin WIEBUSCH on 27 Sep 2012 at 2:40 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
In this talk I will present some work in progress on the interplay between scattering amplitudes in N=4 SYM and the Yang-Baxter equation. I will start by reviewing the notions of Yangian symmetry and Grassmannian formulation and recall the recently observed connection between the leading part of the dilatation operator for the integrable spin chain and the tree-level amplitudes. I will then merge ... More
Presented by Dr. Livia FERRO on 27 Sep 2012 at 4:10 PM
Presented by A. LENZ on 27 Sep 2012 at 11:50 AM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
I will discuss a systematic approach to the construction of lattice regularizations of a certain class of 1+1 dimensional integrable quantum field theories. The method is based on the identification of the relevant algebraic structure combined with a systematic analysis of its representations. I will focus on the example of affine Toda theories. Remarkable factorization/fusion properties of som ... More
Presented by Dr. carlo MENEGHELLI on 26 Sep 2012 at 4:50 PM
We present the phenomenology of the gravitino dark matter scenario at the LHC. We consider the case that the next-to-lightest supersymmetric particle (NLSP) is the lighter stau. For a wide range of gravitino masses the lighter stau is stable on the scale of a detector. Such a particle will give rise to a prominent signature as a ’slow muon’. The dominant production channel of staus depends str ... More
Presented by Mr. Jan HEISIG on 27 Sep 2012 at 4:50 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
In the talk I will motivate why direct perturbative calculations in N=4 SYM theory and in ist (super9 conformal deformations are of interest and I will summarize some of our recent results and work in progress.
Presented by Mr. Christoph SIEG on 27 Sep 2012 at 5:40 PM
Based on my work arxiv:1208.0601 with R. Hill and M. Solon, I will present a formalism derived from Wigner's little group that allows the construction of heavy particle effective Lagrangians with a Lorentz invariant S-matrix. In contrast to some previous approaches this is achieved directly by field transformations without calculating the Lorentz charges and their commutation relations. I will sh ... More
Presented by Dr. Johannes Heinonen HEINONEN on 26 Sep 2012 at 4:30 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Calculating scattering amplitudes in a flat background is one of the first things to learn in string theory: the subject started after all with Veneziano's amplitude. Beyond four external legs however explicit computations get prohibitively complex quickly using standard world-sheet methods. In this talk I will show how one can use on-shell super-symmetry in type IIB superstring theory to bypass t ... More
Presented by Dr. Rutger BOELS on 26 Sep 2012 at 2:30 PM
We study the extension of the MFV hypothesis to the MSSM without R-parity. The novelty of our approach lies in the observation that supersymmetry enhances the global symmetry of the kinetic term and in the fact that we consider as irreducible sources of flavor breaking all the couplings of the superpotential, including the R-parity violating ones. When R-parity violation is responsible for neutrin ... More
Presented by Dr. Luca DI LUZIO on 26 Sep 2012 at 2:40 PM
Presented by J. REUTER on 28 Sep 2012 at 10:10 AM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
String corrections to open superstring tree level amplitudes take a striking and elegant form once the contributions from different classes of multiple zeta values are appropriately disentangled. This novel organization of the alpha prime expansion makes use of a Hopf algebra structure underlying the motivic version of multiple zeta values: It induces an isomorphism which casts the amplitudes into ... More
Presented by Dr. Oliver SCHLOTTERER on 26 Sep 2012 at 4:10 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
Conversions and semi-annihilations of dark matter (DM) particles in addition to the standard DM annihilations are considered in a three-component DM system. We find that the relic abundance of DM can be very sensitive to these non-standard DM annihilation processes, which has been recently found for two-component DM systems. To consider a concrete model of a three-component DM system, we extend th ... More
Presented by Mr. Michael DUERR on 26 Sep 2012 at 4:10 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
In this talk, I will investigate n-gluon scattering amplitudes in the multi-Regge region of N=4 supersymmetric Yang-Mills theory at strong coupling. To leading order, the amplitude at strong coupling is given in terms of a minimal surface in AdS5. The area of this surface can be calculated by a set of non-linear integral equations, which, however, do not allow an analytic solution for arbitrary ki ... More
Presented by Martin SPRENGER on 27 Sep 2012 at 3:50 PM
We present predictions of the total production cross sections of pairs of squarks and gluinos at the LHC, which incorporate a combined resummation of soft logarithms and Coulomb singularities, including bound-state contributions. These terms dominate the threshold region of the partonic cross section and are resummed directly in momentum space using an effective-theory framework based on SCET and ... More
Presented by Mr. Chris WEVER on 27 Sep 2012 at 2:40 PM
Presented by S. POZZORINI on 26 Sep 2012 at 11:15 AM
We present an analysis of the signature 2j + ETmiss (+X) via squark-squark production and direct decay into the lightest neutralino, pp -> squark squark -> j j chi_1^0 chi_1^0 (+X), in next-to-leading order QCD within the framework of the minimal supersymmetric standard model. In our approximation the produced squarks are treated on shell. Thus, the calculation of production and decay factorizes. ... More
Presented by Mr. Jonas LINDERT on 27 Sep 2012 at 2:00 PM
Results for the top-pair production cross section at the Tevtron and the LHC will be presented, including a combined resummation of threshold logarithms and Coulomb corrections at NNLL accuracy. The remaining theoretical and PDF uncertainties and prospects for the measurement of the top mass from the total cross section will be discussed.
Presented by Dr. Christian SCHWINN on 26 Sep 2012 at 3:50 PM
Current results of LHC experiments exclude large area of light new particle region, namely natural parameter space, in supersymmetric extension models. One of the possibilities for achieving the correct electroweak symmetry break- ing naturally is low scale messenger scenario. Actually, the next-to-minimal supersymmetric standard model with TeV scale mirage mediation realizes the natural elec ... More
Presented by Dr. Masaki ASANO on 27 Sep 2012 at 6:00 PM
We analyse the naturalness of the Minimal Supersymmetric Standard Model (MSSM) in the light of recent LHC results from the ATLAS and CMS experiments. We study non-universal boundary conditions for the scalar and the gaugino sector, with fixed relations between some of the soft breaking parameters, and find a significant reduction of fine-tuning for non-universal gaugino masses. For a Higgs mass of ... More
Presented by Dr. Martin SPINRATH on 27 Sep 2012 at 4:10 PM
We evaluate two-body decay modes of neutralinos in the Minimal Supersymmetric Standard Model with complex parameters (cMSSM). Assuming heavy scalar quarks we take into account all two-body decay channels involving charginos, neutralinos, (scalar) leptons, Higgs bosons and Standard Model gauge bosons. The evaluation of the decay widths is based on a full one-loop calculation including hard and soft ... More
Presented by Dr. Aoife BHARUCHA on 26 Sep 2012 at 2:40 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
In recent years a host of new structures, such as Yangian symmetries and the duality between color and kinematics, have been discovered in the study of maximally supersymmetric scattering amplitudes. It is natural to question whether these structures can be found in a wider class of theories. In this talk we provide evidence for analogous structures in three-dimensional supersymmetric Cher ... More
Presented by Tristan MCLOUGHLIN on 27 Sep 2012 at 3:00 PM
New Physics patterns of D decays to two pseudoscalars are studied in the framework of SU(3) flavor symmetry including breaking effects.
Presented by Mr. Stefan SCHACHT on 26 Sep 2012 at 3:50 PM
Session: Parallel Session 1: Particle Phenomenology
Track: Particle Phenomenology
In future linear colliders, ultrarelativistic charge bunches with associated electromagnetic fields approaching or exceeding the Schwinger limit, will interact at the IP. With such strong fields, vacuum polarisation becomes significant and, in order to quantify the effect on physics processes, new analytic calculations in the Furry interaction picture are necessary. Up to now, Furry picture calcu ... More
Presented by Anthony HARTIN on 27 Sep 2012 at 6:40 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
The observed baryon asymmetry of the Universe can be elegantly explained in the leptogenesis scenario, where a net lepton asymmetry produced by the decay of heavy right-handed neutrinos is then transfered to the baryon number through the Standard Model sphalerons. Being an intrinsicly quantum effect the generation of such an asymmetry in the hot early Universe can be described systematically on ... More
Presented by Mr. Tibor FROSSARD on 27 Sep 2012 at 2:00 PM
In this talk the new version of the public program SecDec 2.0 for the numerical evaluation of multi-loop integrals with several mass scales is presented. The program is based on sector decomposition to extract dimensionally regulated singularities. To deal with integrable singularities due to mass thresholds, the integration contour is deformed into the complex plane. As applications, numerical ... More
Presented by Sophia BOROWKA on 26 Sep 2012 at 4:30 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
We discuss observational degeneracy between non-canonical and canonical single field inflation. We map the dynamics of the non-canonical inflationary trajectory to a Lagrangian with canonically normalized kinetic term and a scalar potential. At the level of the two-point function, the two theories are observationally degenerate at all times. To obtain observationally degeneracy at the level of the ... More
Presented by Mr. Markus RUMMEL on 27 Sep 2012 at 4:50 PM
We present a one-loop order lattice perturbation theory calculation of a subset of Heavy Quark Effective Theory parameters. HQET being an effective theory is defined through a set of parameters which should be fixed in a process called matching, order by order in 1/m. We consider 6 matching conditions which are needed for the determination of, for example, the f_B decay constant and which inclu ... More
Presented by Dr. Piotr KORCYL on 26 Sep 2012 at 4:10 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
Searches for Dark Matter particles with indirect detection techniques have reached an important milestone with the measurements of the anti-proton and positron spectra by the PAMELA experiment and the gamma-ray fluxes by the FERMI-LAT experiment. While the γ-ray results have been used to test the thermal Dark Matter hypothesis and constrain the Dark Matter annihilation cross section into Standard ... More
Presented by Mr. Jonathan DA SILVA on 26 Sep 2012 at 3:00 PM
Presented by P. JIMENEZ DELGADO on 26 Sep 2012 at 10:10 AM
I will discuss phenomenological aspects of the GNMSSM.
Presented by Dr. Kai SCHMIDT-HOBERG on 27 Sep 2012 at 4:30 PM
Presented by M. SCHOTT on 26 Sep 2012 at 11:50 AM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
The search for cosmic antideuterons has been proposed as a promising method to indirectly detect dark matter, due to the very small background flux from spallations expected at the energies relevant to experiments. The antideuteron flux from dark matter annihilation or decays is, however, severely constrained by the non-observation of an excess in the antiproton-to-proton fraction measured by PAME ... More
Presented by Mr. Sebastian WILD on 26 Sep 2012 at 3:50 PM
I will explain why I belive in low energy SUSY more strongly than before the LHC.
Presented by Prof. Tsutomu YANAGIDA on 27 Sep 2012 at 3:50 PM
We present improved predictions for the total hadronic cross section of gluino pair production at hadron colliders including NNLO threshold corrections. Here, we give analytic formulas for the color-decomposed NLO and (approximated) NNLO scaling functions, which allow for a resummation of Sudakov logarythms up to NNLL. We perform the resummation in Mellin space and give analytic results for t ... More
Presented by Dr. Torsten PFOH on 27 Sep 2012 at 2:20 PM
We present recent results on the 3-loop fermion-loop corrections to the asymptotic heavy flavor Wilson coefficients of the structure function $F_2(x,Q^2)$ in the asymptotic region $Q^2 \gg m^2$. This includes results on contributions with two different masses $m_c, m_b$ which first emerge at 3-loop level. We also obtained first results on more advanced toplogies of ladder- or benz-t ... More
Presented by Fabian WISSBROCK on 26 Sep 2012 at 5:10 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
In standard cosmology the present ratio of the dark matter (DM) and baryon energy densities is set by two completely unrelated mechanisms: the DM production mechanism and baryogenesis. Therefore, the fact that the observed value for this ratio is close to one may appear as a puzzling coincidence. A scalar field interacting differently with DM and baryons can explain dynamically why the ratio of ... More
Presented by Dr. Riccardo CATENA on 27 Sep 2012 at 3:50 PM
Presented by C. MARIOTTI on 25 Sep 2012 at 2:15 PM
Presented by R. HARLANDER on 25 Sep 2012 at 4:30 PM
We discuss the use of the variable s_hat_min, which has been proposed in order to measure the hard scale of a multi parton final state event using inclusive quantities only, on a SUSY data sample for a 14TeV LHC. In its original version, where this variable was proposed on calorimeter level, the direct correlation to the hard scattering scale does not survive when effects from soft physics are tak ... More
Presented by Dr. Tania ROBENS on 27 Sep 2012 at 4:50 PM
Session: Parallel Session 1: Particle Phenomenology
Track: Particle Phenomenology
We examine what scattering cross sections of Visible to Hidden sectors that break SUSY and are strongly coupled can tell us about supersymmetry breaking and its mediation. We apply Vector Meson Dominance and Holographic techniques to encode resonances in visible to hidden sector processes. We draw on analogies with QCD and the AdS/QCD programme.
Presented by Dr. Moritz MCGARRIE on 27 Sep 2012 at 7:00 PM
Presented by M. SCHUMACHER on 25 Sep 2012 at 3:25 PM
Presented by F. MOORTGAT on 28 Sep 2012 at 11:15 AM
Presented by M. KRAEMER on 28 Sep 2012 at 12:25 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
We propose a new model of D3-brane inflation in a recently constructed class of warped throat backgrounds of Type IIB Supergravity, which are modifications of the Klebanov-Strassler background in the IR region. The dilaton has a non-trivial profile along the radial direction and induces a potential for the D3-brane. This contribution to the D3-brane potential generically features an inflection poi ... More
Presented by Sebastian HALTER on 27 Sep 2012 at 4:30 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
We consider a smooth hybrid inflation scenario based on a supersymmetric SU(2)_L x SU(2)_R x U(1)_(B-L) model. The Higgs triplets involved in the model play a key role in inflation as well as in explaining the observed baryon asymmetry of the universe. We show that the baryon asymmetry can originate via non-thermal triplet leptogenesis from the decay of SU(2)_(B−L) triplets, whose ... More
Presented by Dr. ARUNANSU SIL on 27 Sep 2012 at 4:10 PM
The production of SUSY particles at the LHC is dominated by processes involving coloured sparticles in the final state. Due to the high importance of these processes for SUSY searches at the LHC, precise theoretical predictions are needed. Higher-order QCD corrections are dominated by large logarithmic terms due to the emission of soft gluons from initial and final state particles. A systematic tr ... More
Presented by Silja Christine THEWES on 26 Sep 2012 at 4:10 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
I discuss two-point functions on the torus in the SU(2) Wess-Zumino-Witten model. I construct an explicit expression for the current blocks of the spin-k/2-spin-k/2 torus two-point function. As a first check, I consider the factorization limits of the current blocks as well as their monodromy properties. I then prove that the current blocks solve the corresponding Knizhnik-Zamolodchiko ... More
Presented by Dr. Ingo KIRSCH on 26 Sep 2012 at 3:50 PM
In double parton interactions the two hard scatterings are correlated via double parton densities. We study the double Drell-Yan process and investigate the impact of the correlations on the differential cross section. In particular the spin of the quarks originating from the same proton can be correlated, affecting both the magnitude and the distributions of the cross section. We set upper limits ... More
Presented by Tomas KASEMETS on 27 Sep 2012 at 4:30 PM
Recent experimental and theoretical progress regarding B --> K^(*) l^+ l^− decays led to improved bounds on the Wilson coefficients C_9 and C_10 of four-fermion operators of the |∆B| = |∆S| = 1 effective Hamiltonian. We analyze the resulting implications on squark flavor violation in the MSSM and obtain new constraints on flavor-changing left-right mixing in the up-squark-sector. We find the ... More
Presented by Dr. Christian GROSS on 26 Sep 2012 at 2:20 PM
Session: Parallel Session 1: Particle Phenomenology
Track: Particle Phenomenology
In this talk, I will briefly review the phenomenology of light sterile neutrinos. Then I will concentrate on the theoretical realizations of light sterile neutrinos, in particular a model based on flavor A4 symmetry and Froggatt-Nielsen mechanism.
Presented by Dr. He ZHANG on 26 Sep 2012 at 4:50 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
String compactifications and string model building have mainly been pursued on Calabi–Yau manifolds of a certain type: complete intersections in toric varieties. A powerful tool to study such Calabi-Yau manifolds is provided by the two-dimensional gauged linear sigma model with abelian gauge groups. In this talk I consider gauged linear sigma models with non-abelian gauge groups so as to describ ... More
Presented by Hans JOCKERS on 27 Sep 2012 at 2:30 PM
Right-handed light quarks could be largely composite compatibly with experimental searches at the LHC and precision tests on Standard Model couplings. In these scenarios, which are also motivated by flavor physics, one expects large cross-section for the production of new resonances coupled to light quarks. We study the possible experimental signatures of right-handed compositeness at the LHC and ... More
Presented by Mr. Maikel DE VRIES on 27 Sep 2012 at 6:00 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
In superconformal D-term inflation, dangerous supergravity corrections to the scalar potential are controlled by a superconformal symmetry of the matter sector of the Lagrangian, a concept which has received recent interest in the context of Higgs inflation. Working out this idea in the context of D-term inflation, we find an interesting phenomology, in particular a two-field inflationary phase on ... More
Presented by Valerie DOMCKE on 27 Sep 2012 at 4:30 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
We describe the holographic computation of supercharge diffusion constants in theories dual to gravitational theories on the background of AdS black brane solutions (of arbitrary dimension and at vanishing chemical potential for R charges). The computation is performed via the low frequency, low momentum pole of the correlator of supercurrents, which describes the hydrodynamic "phonino" mode, and ... More
Presented by Mr. Stephan STEINFURT on 26 Sep 2012 at 4:30 PM
We study the next-to-minimal supersymmetric standard model. We consider soft supersymmetry breaking parameters, which are induced by the mirage mediation mechanism of supersymmetry breaking. We concentrate on the mirage mediation, where the so-called mirage scale is the TeV scale. In this scenario, we can realize the effective mu-term the up-type Higgs soft mass of O(200) GeV, while other masse ... More
Presented by Dr. Takashi SHIMOMURA on 27 Sep 2012 at 5:40 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
An analysis of the Fermi gamma ray space telescope data has recently revealed a resolved gamma-ray feature close to the galactic center which is consistent with monochromatic photons at an energy of about 130 GeV. If interpreted in terms of dark matter (DM) annihilating into gamma gamma (gamma Z,gamma H), this would correspond to a DM article mass of roughly 130 GeV (145 GeV, 155 GeV). The rate fo ... More
Presented by Mr. Martin VOLLMANN, Dr. Masaki ASANO on 26 Sep 2012 at 2:00 PM
We present an updated global analysis of the GUT-constrained models CMSSM and CNMSSM, taking into account the recent observation of a SM Higgs-like signal at the LHC. In both our analyses, we implement the CMS razor limit on supersymmetry, based on ~5/fb datasets, with an approximate but accurate likelihood map constructed through a simulation of the detector efficiency. In the CNMSSM we conside ... More
Presented by Dr. Enrico Maria SESSOLO on 27 Sep 2012 at 6:40 PM
Presented by Z. MARSHALL on 26 Sep 2012 at 9:00 AM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
We interpret the recently discovered Higgs candidate as a standard Higgs Boson originating from an underlying string-derived supersymmetric theory. The observed mass range of 124...126 GeV points towards a vanishing quartic coupling at intermediate to high scales. This compels us to study a class of String/F-Theory based models in which symmetries enforce a vanishing quartic Higgs coupling near ... More
Presented by Mr. Alexander KNOCHEL on 27 Sep 2012 at 4:50 PM
Presented by M. GRAZZINI on 25 Sep 2012 at 2:50 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
It has been shown by Chernodub et al. that the rho meson of QCD in the presence of a very large magnetic field condenses, giving a superconducting ground state. The solution takes on a lattice form of an Abrikosov type. We calculate the holographic dual of this phenomenon. In particular we show that for magnetic fields close to the critical value, the lattice takes on a triangular form, in agreeme ... More
Presented by Dr. Jonathan SHOCK on 26 Sep 2012 at 3:00 PM
Presented by E. LAENEN on 27 Sep 2012 at 10:10 AM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
We consider the density profile of the central region of dark matter haloes. It turns out that under very general conditions the profile is universal: it depends almost not at all on the properties of the initial perturbation and is very akin, but not identical, to the Einasto profile. We estimate the size of the 'central core' of the distribution, i.e., the extent of the very central region wi ... More
Presented by Dr. Anton BAUSHEV on 26 Sep 2012 at 4:30 PM
Presented by M. BUTENSCHOEN on 26 Sep 2012 at 9:35 AM
Presented by C. SCHWANENBERGER on 27 Sep 2012 at 9:00 AM
Effects from a finite top quark mass on differential distributions in the Higgs+jet production cross section through gluon fusion are studied at next-to-leading order in the strong coupling, i.e. O(αs^4). Terms formally subleading in 1/mTop are calculated, and their influence on the transverse momentum and rapidity distribution of the Higgs boson are evaluated. We find that, for the differential ... More
Presented by Mr. Tobias NEUMANN on 26 Sep 2012 at 2:20 PM
Presented by P. UWER on 27 Sep 2012 at 9:35 AM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Gauge/gravity duality has proved to be a very successful tool for describing strongly coupled systems in particle physics and heavy ion physics. The application of the gauge/gravity duality to quantum matter is a promising candidate to explain questions concerning non-zero temperature dynamics and transport coefficients. To a large extent, the success of applications of gauge/gravity duality to ... More
Presented by Mr. Steffen MUELLER on 27 Sep 2012 at 6:20 PM
Session: Parallel Session 3: Strings & Mathematical Physics
Track: Strings & Mathematical Physics
Higher-spin gauge theories become particularly simple in 2+1 dimensions, where there are no propagating degrees of freedom. Nevertheless they are useful toy models to study e.g. higher-spin generalisations of black holes or holographic dualities. Most of the research on this subject has been done in the frame-like formalism with generalised vielbeins and spin connections. I will report on recent p ... More
Presented by Dr. Stefan FREDENHAGEN on 26 Sep 2012 at 2:00 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
Leptogenesis is an attractive mechanism for explaining the baryon asymmetry of the universe, and provides interesting links between cosmology and neutrino physics. In addition, within the scenario of resonant leptogenesis, models with implications for LHC and future colliders have been proposed. However, the predictions depend on a correct calculation of the generated asymmetry in terms of the fun ... More
Presented by Mr. Mathias GARNY on 27 Sep 2012 at 2:20 PM
The anomalous magnetic moment of the muon, aμ , is an important quantity to test the Standard Model. The highly precise experimental and theoretical determination of aμ leads to a discrepancy of 3 to 4σ. This deviation could be explained by contributions of the MSSM. To be competitive to the high accuracy of the experiment, in particular the future improved measurements, and the SM theory predi ... More
Presented by Mr. Sebastian PAßEHR on 27 Sep 2012 at 3:00 PM
Session: Parallel Session 2: Cosmology & Astroparticle Physics
Track: Cosmology & Astroparticle Physics
The spontaneous breaking of B-L symmetry naturally accounts for the small observed neutrino masses via the seesaw mechanism. We have recently shown that the cosmological realization of B-L breaking in a supersymmetric theory can successfully generate the initial conditions of the hot early universe, i.e. entropy, baryon asymmetry and dark matter, if the gravitino is the lightest superparticle (LSP ... More
Presented by Kai SCHMITZ on 27 Sep 2012 at 2:40 PM
on 25 Sep 2012 at 2:00 PM
Presented by C. CSAKI on 28 Sep 2012 at 11:50 AM
The recent observations of the leptonic mixing angle \theta^PMNS_13 are consistent with \theta^PMNS_13 = \theta_C / \sqrt2 (with \theta_C being the Cabibbo angle \theta^CKM_12). We discuss how this relation can emerge in Grand Unified Theories (GUTs) via charged lepton corrections. The key ingredient is that in GUTs the down-type quark Yukawa matrix and the charged lepton Yukawa matrix are generat ... More
Presented by Mr. Vinzenz MAURER on 26 Sep 2012 at 3:00 PM