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Barbara GUERZONI07/05/2012, 09:00ALICE is the LHC experiment dedicated to the study of heavy-ion collisions. Its features also make it an ideal detector for QCD studies in pp collisions. Thanks to its excellent particle identification capabilities and low material budget, ALICE can measure hadron and lepton production over a wide momentum range both in pp and in Pb-Pb collisions. In this talk we review recent QCD results,...Go to contribution page
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Bora ISILDAK07/05/2012, 09:30Results from a variety of QCD and Heavy Ion physics analyses are presented using pp and PbPb collision data collected by the CMS experiment. The data distributions are compared with the predictions of Monte Carlo event generators and with perturbative QCD calculations.Go to contribution page
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Krzysztof WOZNIAK07/05/2012, 10:00
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Daniele Binosi (E)07/05/2012, 11:00I will report on recent results which provides novel qualitative as well as quantitative information on the infrared sector of QCD. In particular i will concentrate on i) the unquenching of the gluon propagator through the SDEs as well as ii) the comparison of these results with new lattice data obtained from configurations containing 2 light and two heavy quarks, iii) the all order equation...Go to contribution page
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Mr Mario Schroeck (Universitaet Graz)07/05/2012, 11:30Chiral symmetry breaking in Quantum Chromodynamics is associated with the low lying spectral modes of the Dirac operator according to the Banks-Casher relation. Here we study how removal of a variable number of low lying modes from the valence quark sector affects the masses of the first excited states of baryons and mesons in two flavor lattice QCD.Go to contribution page
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Valentina Verduci (University of Graz)07/05/2012, 12:00We study positive and negative parity states of the nucleon, with particular interest in the parity reversal pattern of the Roper resonance. We investigate the isospin 1/2 channel of the pion-nucleon scattering on the lattice, including meson-nucleon interpolators. The distillation method makes the computation of disconnected diagrams affordable, while the variational method is used to extract...Go to contribution page
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George Rupp (IST)07/05/2012, 17:00Contrary to widespread belief, there are not too many observed mesonic resonances to be accounted for by normal quark-antiquark states, which is the usually invoked argument to justify the introduction of (crypto)exotic configurations. The reasons why newly detected mesonic enhancements often seem to be incompatible with $q\bar{q}$ states can be manifold: (i) the underlying confining...Go to contribution page
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Susana Coito (IST-Lisbon)07/05/2012, 17:30Recently, we have successfully described [1] the controversial X(3872) charmonium resonance as a normal axial-vector ($J^{PC}=1^{++}$) $c\bar{c}$ state, but non-perturbatively unitarised and mass-shifted owing to several OZI-allowed and OZI-suppressed decay channels. Nevertheless, many authors still consider the X(3872) a meson-meson molecule, due to its very close proximity to the...Go to contribution page
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Daniel Maitre (CERN)07/05/2012, 18:30Recent progress in the calculation of Next-To-Leading order observables in perturbative QCD are presented, with a focus on results from so-called unitarity techniques for high multiplicity processes.Go to contribution page
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Ulrike Eilhauer (I)07/05/2012, 19:00The interaction of particles is one of the fundamental questions in Physics. We decided to study the interaction between a gluon gas produced at the onset of ‘Heavy Ion Collisions’, and forming pions and other hadrons. To do so, we develop a code for Graphics Processing Units, using CUDA as program language, based on the CPU code ‘Boltzmann Approach for Many Parton Scattering (BAMPS)’...Go to contribution page
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Ydalia Delgado Mercado (Karl-Franzens University)08/05/2012, 09:00We study effective theories for QCD at non-zero temperature and finite chemical potential, using local Polyakov loops as the degrees of freedom. The sign problem is solved by exactly mapping the partition sum to a sum over flux variables with only real and positive weights, and the theory is then accessible to Monte Carlo Techniques. We determine the phase diagram as a function of the...Go to contribution page
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Mr Sandeep Chatterjee (PhD student)08/05/2012, 09:30We consider the $(2+1)$ flavor Polyakov Quark Meson Model (PQM) and study the effect of including fermion vacuum fluctuations on the thermodynamics and phase diagram. The variation of the thermodynamic quantities across the phase transition region becomes smoother. This results in better agreement with the lattice QCD (LQCD) data. The critical end point is pushed into higher values of the...Go to contribution page
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Paulo Silva (U)08/05/2012, 10:00We study the Landau gauge gluon propagator at zero and finite temperature using lattice simulations. Particular attention is given to the finite size effects and to the infrared behaviour. Furthermore, the modeling of the lattice data is discussed.Go to contribution page
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Mrs Elina Seel (ITP Frankfurt University)08/05/2012, 11:00The thermodynamics of the O(N) model in 1+1 dimensions is studied applying the auxiliary field method. In order to compute the thermodynamical quantities we apply the CJT formalism within the Hartree-Fock approximation extended by sunset diagrams. The numerical results for the renormalized mass of the scalar particles, the pressure, the trace anomaly and the energy density are presented and...Go to contribution page
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Francesco Nitti08/05/2012, 11:30
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Piotr Bozek08/05/2012, 12:00We apply hydrodynamic model calculations to predict soft particle observables in relativistic heavy-ion collisions. Results of simulations of a 3+1D viscous hydrodynamic model are presented. A satisfactory description of transverse momentum spectra, HBT radii, and elliptic and triangular flows in heavy-ion collisions at RHIC and the LHC is obtained. Most advanced simulations of the model...Go to contribution page
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Edmond Iancu08/05/2012, 17:00
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Pol Gossiaux08/05/2012, 17:30
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Mr Stanislaus Janowski (Institute for Theoretical Physics, J. W. Goethe University)08/05/2012, 18:30We present a two-flavour linear sigma model with global chiral symmetry and (axial-)vector mesons as well as an additional glueball degree of freedom. We study the structure of the well-established scalar resonances f0(1370) and f0(1500): by a fit to experimentally known decay widths we find that f0(1370) is predominantly a quark-antiquark state and f0(1500) is predominantly a...Go to contribution page
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Anja HABERSETZER08/05/2012, 19:00
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Pedro Costa (Physics Department of the University of Coimbra)09/05/2012, 09:00We investigate the phase diagram of the so-called Polyakov–Nambu–Jona-Lasinio model at finite temperature and nonzero chemical potential. The calculations are performed in the framework of the PNJL Lagrangian in the light and strange quark sector (u,d,s) which includes the 't Hooft instanton induced interaction term that breaks the axial symmetry, and the quarks are coupled to the (spatially...Go to contribution page
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Stefano Lottini (Goethe Universitaet, Frankfurt am Main)09/05/2012, 09:30We examine the phase diagram of hadronic matter when the number of colours Nc, as well as temperature and density, are varied. We show that in this regime a new percolation phase transition is possible, and examine the implications of this transition for extrapolations to physical QCD of the large-Nc limit.Go to contribution page
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David Ibáñez Gil de Ramales (University of Valencia)09/05/2012, 10:00Recent large-volume lattice simulations have established that, in the Landau gauge, the gluon propagator is infrared-finite. The most natural way to explain this observed finiteness is the generation of a nonperturbative, momentum-dependent gluon mass. Such a mass may be generated without compromising the gauge-invariance of the fundamental QCD Lagrangian by employing the famous...Go to contribution page
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Walaa ESHRAIM09/05/2012, 11:00We present the extension of the globally chirally invariant N_f=3 linear sigma model with vector and axial-vector degrees of freedom to N_f=4. We calculate the masses of axial- vector mesons from the extended model and present it.Go to contribution page
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Mr Denis Parganlija (TU Vienna, ITP)09/05/2012, 11:30Scalar mesons have been one of the most hotly debated issues of low-energy QCD for decades. Experimental data show the existence of six scalar isosinglet states in the region below 1 GeV -- next to the famous sigma meson, there are five states with the same quantum numbers but higher energies than the energy of the sigma. If we consider u and d quarks as degenerate and work in a theoretical...Go to contribution page
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Dr Aneta Iordanova (University of California, Riverside)10/05/2012, 09:00The PHENIX experiment has produced an extensive array of measurements in heavy ion collisions in order to study the created strongly interacting medium. This medium is seen to modify the properties of many global and high-momentum observables; a strong suppression relative to that expected from p+p collisions is observed. The medium forms after the initial hard-scattering of partons, which...Go to contribution page
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Sonia Kabana10/05/2012, 09:30We present some highlights of recent results from STAR experiment at RHIC. Selected topics from results on heavy quarkonia production, collectivity and their energy and system dependence are presented from the experiments heavy ion program.Go to contribution page
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Claudia Ratti10/05/2012, 10:00We present the new results of the Wuppertal-Budapest lattice QCD collaboration on flavor diagonal and non-diagonal quark number susceptibilities with 2+1 staggered quark flavors, in a temperature regime between 120 and 400 MeV. A Symanzik improved gauge and a stout-link improved staggered fermion action is utilized; the light and strange quark masses are set to their physical values....Go to contribution page
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Andre Amado (CFTP - IST)10/05/2012, 11:00We utilize Polyakov loop correlations to study 4D compact U(1) flux tubes and the static electron-positron potential in lattice gauge theory. By using field operators it is possible in U(1) lattice gauge theory to probe directly the electric and magnetic fields. In order to improve the signal-to-noise ratio in the confinement phase, we apply the Lüscher-Weiss multilevel algorithm. Our code...Go to contribution page
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Marina Marinkovic (Humboldt University Berlin)10/05/2012, 11:30Lattice QCD is a first-principle computational tool to describe the properties of hadron spectrum and decay modes, which allows for precision tests of the Standard Model. The algorithm of choice for lattice QCD simulations is known as the Hybrid Monte Carlo (HMC) algorithm. I am going to discuss recent algorithmic and implementation improvements which lead to a better scaling of the new highly...Go to contribution page
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Rene Bellwied (University of Houston (US))10/05/2012, 17:00Recent work on in-medium hadronization in the non-equilibrated fragmentation process has been followed up by studies on bound state formation in the equilibrated deconfined matter as described by lattice QCD. Through the comparison to PNJL model calculations we find evidence for an extended phase of mixed degrees of freedom. The extracted hadron formation probability exhibits flavor and...Go to contribution page
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Nuno Cardoso (IST)10/05/2012, 17:30We explore the performance of CUDA in performing Landau gauge fixing in Lattice SU(3), using the steepest descent method with Fourier acceleration. The code performance was tested in a Tesla C2070, Fermi architecture. We also present a study of the string tension at finite temperature in the confined phase. The string tension is extracted from the colour averaged free energy and the...Go to contribution page
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Ioannis Bouras (University of Frankfurt a.M.)10/05/2012, 18:30Using a microscopic transport model we investigate the evolution of conical structures originating from the supersonic projectile moving through the hot matter of ultrarelativistic particles. Using different scenarios for the interaction between projectile and matter, and different transport properties of the matter, we study the formation and structure of Mach cones. Especially, a dependence...Go to contribution page
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Marco Cardoso (Instituto Superior Técnico)10/05/2012, 19:00In this work we compute the color fields in the mediator plane between a static quark and a static antiquark using quenched lattice QCD. In special, we see the effect of the quark-antiquark distance on this fields. To obtain this results an improved multihit technique is developed and an extend smearing technique is used. The results for the fields are fitted with different models and in...Go to contribution page
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Dionysis TRIANTAFYLLOPOULOS11/05/2012, 09:00At high energy and/or for large atomic numbers the wave-function of a generic hadron is dominated by gluon modes and saturates. This is the Color Glass Condensate (CGC) and it can manifest itself in Deep Inelastic Scattering and in Proton-Proton and Heavy Ion Collisions. The evolution of the CGC with energy satisfies a Renormalization Group Equation, the JIMWLK equation. We review the theory...Go to contribution page
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Fabio DOMINGUEZ11/05/2012, 09:30In the context of high density QCD systems, the high occupancy numbers make it convenient to consider the strong classical fields as the appropriate degrees of freedom. High energy collision experiments are particularly sensitive to the correlators of these multiple sources by means of the multiple scattering undergone by the produced particles. By carefully studying the color structure of...Go to contribution page
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Ms Márcia Quaresma (LIP-Lisbon)11/05/2012, 10:00The Parton Distribution Functions (PDFs) and the spin structure of the nucleon are important topics studied by COMPASS in Semi-Inclusive Deep Inelastic Scattering. The Drell-Yan process is a complementary way to access the Transverse Momentum Dependent PDFs (TMD PDFs), using a transversely polarized target. Studying the angular distributions of dimuons from the Drell-Yan reactions in the...Go to contribution page
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Prof. Brigitte Hiller (Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, P-3004-516 Coimbra, Portugal)11/05/2012, 11:00The topic I would like to present is the effect of chiral multiquark interactions (with emphasis on the new eight quark terms) on the temperature versus baryonic chemical potential phase diagram of this extended Nambu Jona Lasinio model of QCD. The talk is mainly based on the works: The Phase diagram for the Nambu-Jona-Lasinio model with 't Hooft and eight-quark interactions. B. Hiller, J....Go to contribution page
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Carina Popovici11/05/2012, 11:30In this talk we consider the heavy quark limit of nonperturbative Coulomb gauge QCD. In this framework, we demonstrate, under truncation, a direct connection between the Yang-Mills sector of the theory (the temporal component of the gluon propagator) and the quark confining potential. We further show that only color singlet quark-antiquark (meson) and three-quark (baryon) bound states are...Go to contribution page
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Mr Vladimir Sauli (DTP, NPI Rez near Prague)11/05/2012, 12:00When generalizing recent various quantum mechanical models of $c-\bar{c}$ states to Quantum Filed theoretical approach based on BSE one is faced to the solutions that do not exist in non-relativistic limit. Mainly, there is unexpected doubling of the spectrum when comparing to the spectrum expected or known from the experiments as well as the ones known from the solution of the...Go to contribution page
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Dr Marcus Bluhm (Laboratoire SUBATECH)11/05/2012, 17:00The knowledge of transport coefficients of the Quark-Gluon Plasma (QGP) gives fundamental insights into the nature of strongly interacting matter under extreme conditions. By means of relativistic heavy-ion collisions, these properties are intended to be experimentally revealed, providing also information about the structure of the produced hot matter. One of the remarkable...Go to contribution page
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Dr Marlene Nahrgang (SUBATECH, Nantes & FIAS, Frankfurt)11/05/2012, 17:30In thermodynamics system the correlation length of fluctuations of the order parameter diverges at a critical point. This is the basis of expecting large event-by-event fluctuations for heavy-ion collisions that reach in the critical region. Heavy-ion collisions are however very small and dynamic systems, which at most reach local thermal equilibrium. The effect of critical slowing down is...Go to contribution page
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diana nicmorus (Facility for Antiproton and Ion Research in Europe GmbH)11/05/2012, 18:30The new international accelerator facility FAIR under construction in Darmstadt aims at studying matter at atomic, nuclear, and hadronic levels. I will present different aspects of the current status of the Facility for Antiproton and Ion Research. I will discuss the focus of the experiments at FAIR and the associated theory in hadron physics, nuclear structure and compressed nuclear matter...Go to contribution page
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Tord Johansson (Uppsala University)11/05/2012, 19:00The PANDA experiment is one of the major projects at the upcoming Facility for Antiproton and Ion Research (FAIR) facility in Darmstadt, Germany. It will study interactions between antiprotons and protons or nuclei in the momentum range of 1.5 GeV/c to 15 GeV/c with a 4pi state-of-the-art detector. The purpose of the experiment is to learn about fundamental aspects of the strong interaction in...Go to contribution page
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