Description
Posters will be displayed in the Ambassador Room and part of the Regency Room. They will be available for viewing from Tuesday to Thursday.
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Prof. Vincenzo Greco (University of Catania)16/08/2012, 16:00Hadron thermodynamics and chemistryPosterWe study the evolution of the quark-gluon composition of the plasma created in ultra-Relativistic-Heavy Ion Collisions (uRHIC's) employing a partonic transport theory that includes both elastic and inelastic collisions plus a mean fields dymanics associated to the widely used quasi-particle model. The latter, able to describe lattice QCD thermodynamics, implies a "chemical" equilibrium ratio...Go to contribution page
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Riccardo Russo (Universita e INFN (IT))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterOpen heavy flavour hadrons produced in high-energy ion collisions are an interesting tool to investigate the properties of the QCD medium, as they come from the hadronization of heavy quarks which are created in the early stage of the interaction and which experience the whole collision history. Energy loss of heavy quarks in the medium can be investigated by comparing the heavy flavour...Go to contribution page
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Dirk Rischke (U)16/08/2012, 16:00Electroweak probesPosterIn this talk, I present an effective model based on the linear representation of the chiral U(N_f)_r x U(N_f)_l symmetry of QCD. It is demonstrated that a reasonable fit of the mass parameters and coupling constants of the model to hadron vacuum properties can be obtained. This study can contribute to answering the question about the quark content of the scalar isoscalar mesons. The model is...Go to contribution page
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J. Matthew Durham (Los Alamos National Laboratory)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe flexibility of the beam species available at the Relativistic Heavy Ion Collider has enabled the PHENIX Collaboration to examine open heavy flavor production across a wide range of temperature, energy density, and system size. Charm and bottom production in $p+p$ collisions, which is dominated by gluon fusion, is largely consistent with FONLL pQCD calculations. New analysis...Go to contribution page
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Prof. Yuanfang Wu (Institute of Particle Physics, CCNU, Wuhan China)16/08/2012, 16:00Global and collective dynamicsPosterThe radial flow parameters are important quantities in relativistic heavy ion collisions [1]. They constrain the equation of state [2] and in particular, the anisotropic parameter relates to shear viscosity [3]. They are usually extracted from the spectrum of transverse momentum by the parameterizations of Blast-wave model [4]. In the present work, we suggest a direct measure of radial...Go to contribution page
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Taku Gunji (University of Tokyo (JP))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe Time Projection Chamber (TPC) is the central tracking device of the ALICE experiment, providing momentum measurement and particle identification via the specific energy loss dE/dx. The readout rate of the TPC is presently limited by the necessity to prevent ions from the amplification region of the MWPC-based readout chambers to drift back into the drift volume, which is achieved through...Go to contribution page
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499. A novel high momentum particle identification detector for the next generation ALICE experimentAustin Vincent Harton (Chicago State University (US))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterA high momentum particle identification detector is under discussion by the ALICE experiment at CERN as part of its plan for high luminosity data taking in the next decade. The VHMPID detector is improving on well established ring imaging Cerenkov technology by using a pressurized gas volume in a focussing geometry to minimize the radial depth of the device. In this configuration the VHMPID...Go to contribution page
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Dr Yuji Sakai (RIKEN)16/08/2012, 16:00QCD at finite temperature and densityPosterWe propose a QCD-like theory with the Z_{Nc} symmetry. The flavor-dependent twisted boundary condition (TBC) is imposed on Nc degenerate flavor quarks in the SU(Nc) gauge theory. The QCD-like theory is useful to understand the mechanism of color confinement. Dynamics of the QCD-like theory is studied by imposing the TBC on the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model. The Z_{Nc}...Go to contribution page
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Eric Mannel (B)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterConceived and constructed over a decade ago, the PHENIX detector was designed to discover the Quark-Gluon Plasma (QGP). Following on this discovery,the PHENIX collaboration has embarked on a number of upgrades to study the QGP properties in detail, with the next step being a significant overhaul of the PHENIX detector called sPHENIX. sPHENIX includes upgrading the central detector with a...Go to contribution page
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Kurt Jung (Purdue University (US))16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterDileptons are unique probes of the strongly-coupled Quark Gluon Plasma (QGP) created in relativistic heavy-ion collisions. Compared to hadrons, leptons have little interaction with the QGP medium and can thus travel through the entire system with most of the original information intact. This feature allows us to study the properties of the medium during its space-time evolution. The low mass...Go to contribution page
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Michael McCumber (University of Colorado)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe PHENIX experiment at the Relativistic Heavy Ion Collider recently took data in p+p and Au+Au collisions with a new silicon vertex detector (VTX). This upgrade detector is capable of measuring the off-vertex decay of heavy flavor decay electrons via distance of closest approach (DCA). The resulting measured DCA distributions will be a convolution of the parent meson momenta, decay...Go to contribution page
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Dr Thomas Kiess (self)16/08/2012, 16:00New theoretical developmentsPosterWe calculate a way to acquire some current quark mass from a general relativistic effect. For a bare quark, we model that boundary conditions on the spacetime metric can plausibly couple the value of current quark mass to the charge, via external pressure (e.g., as supplied by a background field) at sub-fm length scales. This mechanism acquires some (up to ~ 40%) current quark mass “from”...Go to contribution page
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Nikola for the ALICE-FoCal collaboration Poljak (NIKHEF/Univeristy of Utrecht)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterA forward electromagnetic calorimeter (FoCal), to be placed in the pseudorapidity range of $2.5<\eta<4.5$, is being discussed as one of the upgrade plans for the LHC-ALICE experiment. One of the motivations for building such a detector is the study of direct photons, as well as correlations including photons, pions and jets in pp,pA and AA collisions at the highest LHC energies. Such...Go to contribution page
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Xiangrong Zhu (Central China Normal University CCNU (CN))16/08/2012, 16:00JetsPosterNeutral pion production measured with the ALICE detector in Pb-Pb collisions at the LHC is an important tool to study the properties of the hot and dense medium created in heavy-ion collisions. The neutral pion yield, obtained with the ALICE electromagnetic calorimeter in pp collisions at sqrt(s) = 2.76 and 7 TeV, as well as in Pb-Pb collisions at sqrt(s_NN) = 2.76, is analyzed in terms of...Go to contribution page
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Dr Frederique Grassi (Universidade de Sao Paulo, Brazil)16/08/2012, 16:00Global and collective dynamicsPosterWe calculate flow observables with the NeXSPheRIO ideal hydrodynamic model and make the first comparison to the complete set of mid- rapidity flow measurements made by the PHENIX collaboration in top energy Au+Au collisions. A simultaneous calculation of v2, v3, v4, and the first event-by-event calculation of quadrangular flow defined with respect to the v2 event plane (v4{psi2}) gives...Go to contribution page
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You Zhou (Nikhef and Utrecht University (NL))16/08/2012, 16:00Correlations and fluctuationsPosterThe $\phi$-meson flow is seen as an important observable to study hydrodynamic behavior and partonic collectivity of heavy-ion collisions. We present detailed measurements of $\phi$-meson flow in $\sqrt{s_{NN}}$=2.76 TeV Pb--Pb collisions with the ALICE detector. The results are compared to the flow of other identified particles (kaons, pions, antiprotons, lambdas, cascades ) to investigate...Go to contribution page
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Mr Yuji Hirono (The University of Tokyo)16/08/2012, 16:00QCD at finite temperature and densityPosterQuantum vortices in the color-flavor locked (CFL) phase of QCD have bosonic degrees of freedom localized on them, called the orientational zero modes. We show that the orientational zero modes are electromagnetically charged. As a result, a vortex in the CFL phase nontrivially interacts with photons. We show that a lattice of vortices acts as a polarizer of photons with wavelengths larger than...Go to contribution page
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Joshua Ilany (Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA)16/08/2012, 16:00Electroweak probesPosterAnomalous soft photon production beyond that predicted by standard Bremsstrahlung calculations is a ubiquitous feature in high energy processes, from e+e- to heavy ion collisions. We calculate the electromagnetic current due to the QCD vacuum polarization induced by the qq jets in e+e- annihilation using the Schwinger model, and source Maxwell’s equations with it. The predicted soft photon...Go to contribution page
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Shikshit Gupta (University of Jammu)16/08/2012, 16:00Global and collective dynamicsPosterInformation about the evolution of the system formed during the high energy p + p collisions can be obtained by investigating the charged particle ratios. The particle ratios serve as an important indicator of the collision dynamics [1]. These can be used to probe the process of hadronization in high energy collisions. In this poster, we will present measurements of mid-rapidity antiparticle...Go to contribution page
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Mr Christopher Yaldo (Wayne State University)16/08/2012, 16:00JetsPosterThe main difficulty in precise and systematically controlled jet measurements in heavy-ion collisions is the correction for the soft underlying background fluctuation as well as for additional hard scatterings occurring in the nucleus-nucleus collision. To minimize non-trivial biases in jet-quenching measurements by imposing kinematical constraints on the jet fragmentation and to suppress...Go to contribution page
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Heikki Mäntysaari (University of Jyväskylä, Department of Physics)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterSingle inclusive hadron production in the forward rapidiy region in deuteron-gold collisions is well understood in the Color Glass Condensate (CGC) framework. As a complement to single inclusive spectra, detailed information is obtained with two-particle correlations. Recent measurements of the azimuthal angle correlations at RHIC have shown that there is a strong suppression of the away...Go to contribution page
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Deepa Thomas (University of Utrecht (NL))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe measurement of heavy-flavour (charm and beauty) production in ultra-relativistic heavy ion collisions provides an important test of the parton energy loss mechanism and its predicted color charge and parton mass dependencies. The suppression of electron yields from semi-leptonic decays of D and B mesons in Pb-Pb collisions at the LHC has been observed to be large. Because of the dead-cone...Go to contribution page
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Wei Li (MIT)16/08/2012, 16:00Correlations and fluctuationsPosterAzimuthal anisotropy harmonics have been measured in ultra-central PbPb collisions at a center-of-mass energy per nucleon pair of 2.76 TeV. Top central 0.2\% PbPb collisions have been collected using a unique trigger on total energy at forward hadronic calorimeter and total multiplicity of hits on pixel tracker by the CMS experiment during 2011 LHC PbPb run. A total of about 1.8...Go to contribution page
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Mohammed Younus (Variable Energy Cyclotron Centre)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterWe present the azimuthal correlation of charm, anti-charm pairs produced at LHC energies. We show our results for both proton on proton collision as well as lead on lead collision. An empirical model has been included to show the effect of energy loss on the correlation . Separately an effect of collective flow using blast wave model on the correlation is also shown.Go to contribution page
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Bogdan Theodor Rascanu (Johann-Wolfgang-Goethe Univ.)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterIn ultra-relativistic heavy-ion collisions, charm and beauty quarks are a sensitive tool to probe the flavour and mass dependence of the parton interaction with the medium created in such interactions, the Quark-Gluon Plasma. The level of thermalization of heavy quarks can be studied via the azimuthal anisotropy of their emission in the transverse plane, the elliptic flow v2, at low...Go to contribution page
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Alis Rodriguez Manso (NIKHEF (NL))16/08/2012, 16:00Correlations and fluctuationsPosterThe possible creation of a strongly interacting deconfined phase (Quark-Gluon plasma) in relativistic heavy ion collisions would be measurable in a delayed hadronization time. It was proposed to test this hypothesis via the measurement of correlations between positive and negatively charged pairs pairs as a function of rapidity, the so-called Balance functions, which was done at SPS and RHIC...Go to contribution page
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Dr Kenji Morita (Kyoto University)16/08/2012, 16:00Correlations and fluctuationsPosterWe discuss the influence of the chiral phase transition on the properties of the probability distribution of conserved charges based on effective chiral models and on the Landau theory of phase transition [1]. Statistical fluctuations of the net baryon number have been regarded as a diagnostic tool of the chiral phase transition in QCD and in heavy ion collisions. Normally, they are...Go to contribution page
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Enrico Fragiacomo (Universita e INFN (IT))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterThe study of resonances production in p-p collisions provides constraints on QCD-inspired particle production models. In Pb-Pb collisions, resonances are good probes to estimate the collective properties of the fireball and may add constraints to the estimate of its lifetime. $p_T$ spectra have been measured for the baryonic resonances $\Lambdastar$, $\Sigmastar$ and $\Xistar$ using data...Go to contribution page
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Hui Wang (Michigan state university)16/08/2012, 16:00Exploring the QCD phase diagramPosterThe study of correlations between opposite sign charge pairs can provide a powerful tool to probe the properties of the quark-gluon plasma (QGP). The balance function, which measures the correlations between opposite sign charge pairs, is sensitive to the mechanisms of charge formation and the subsequent relative diffusion of the balancing charges. The study of the balance function can provide...Go to contribution page
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Michal Petran (Czech Technical University (CZ))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterThe short lifespan of the QCD phase at RHIC and LHC suggests fast filamenting disintegration of the supercooled QGP state of matter. The ensemble of all produced hadrons carry information about the physical properties of the disintegrating QGP. For example the energy content is obtained evaluating the energy carried by all hadrons. Considering that many of the particles have not been...Go to contribution page
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John Campbell (T)16/08/2012, 16:00Correlations and fluctuationsPosterAzimuthal emission spectra of various hadron species in ultra-relativistic heavy ion collisions at $\sqrt{s_{NN}} \approx $ 200 GeV exhibit a curious hierarchy at intermediate $p_t$ ($\approx 2-3$ GeV). Rather than being ordered by mass, the spectra seem to be ordered by whether the species is a baryon or meson. It is seen that when the elliptic flow $v_2$ and transverse momentum $p_T$ are...Go to contribution page
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Andrej Ficnar (Columbia University in the City of New York)16/08/2012, 16:00New theoretical developmentsPosterWe present new solutions for holographic falling string models of light quark jet energy loss that suggest a linear path dependence of energy loss, dE/dx ~ x^1, without the nonlinear x^2 dependence assumed previously. This effect, combined with non-conformal deformations and higher curvature corrections of AdS geometry, is shown to be able to account for the small relative reduction of the...Go to contribution page
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jie zhao (lbl&sinap)16/08/2012, 16:00Electroweak probesPosterDilepton production has been proposed to serve as a penetrating probe for the hot and dense medium created in high-energy nuclear collisions. Their small final-state interaction cross sections, let dileptons escape the interaction region undistorted. Since dileptons originate from all stages of a heavy ion reaction, their sources vary with the kinematic phase space under consideration: In...Go to contribution page
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Xiangli Cui (U)16/08/2012, 16:00Global and collective dynamicsPosterDi-leptons are ideal probes of the strongly interacting hot and dense medium created at RHIC. They are not affected by the strong interaction once produced, therefore they can probe the whole evolution of the collision. The di-leptons spectra in the intermediate mass range ($1.1<M_{ll}<3.0$ GeV/$c^{2}$) are directly related to thermal radiation of the Quark-Gluon Plasma (QGP). In the low mass...Go to contribution page
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387. Charge Asymmetry Dependency of $\pi^+/\pi^-$ Azimuthal Anisotropy in Au + Au Collisions at STARHongwei Ke (Central China Normal University)16/08/2012, 16:00Global and collective dynamicsPosterA recent theoretical study indicates that a chiral magnetic wave at finite baryon density could induce an electric quadrupole moment in the quark-gluon plasma produced in heavy ion collisions. The quadrupole deformation will lead to a difference in azimuthal anisotropy $v_2$, between positive and negative pions, and the magnitude of this difference is predicted to be proportional to net charge...Go to contribution page
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Guo-Liang Ma (Shanghai INstitute of Applied Physics (SINAP), CAS)16/08/2012, 16:00Correlations and fluctuationsPosterWith a multi-phase transport model including initial charge separation and string melting, the charge azimuthal correlations for Au+Au collisions at center of mass energies 200, 39, 11.5, 7.7 GeV and Pb+Pb collisions at 2.76 TeV are investigated. Initial charge separations of about 10 % for 200 GeV, 5 % for 39 GeV, 0 % for 11.5 GeV appear to be necessary. This is consistent with decreasing...Go to contribution page
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Charles Riley (Yale University)16/08/2012, 16:00Correlations and fluctuationsPosterThree-particle correlations have been used to probe for local parity violation (LPV) in the quark-gluon plasma (QGP) formed during Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV at RHIC [1]. Further expanding on this analysis, we present our results on looking at these correlations through pairing kaons and pions produced during the collision events (while fixing the third particle to be...Go to contribution page
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Jocelyn Mlynarz (Wayne State University (US))16/08/2012, 16:00Global and collective dynamicsPosterCharge dependent azimuthal correlations relative to the reaction plane measured by the STAR collaboration at RHIC and ALICE at the LHC are consistent with expectations from the strong local parity violation in QGP manifesting itself via the Chiral Magnetic Effect. The background to these measurements comes from interplay of strong anisotropic flow and correlations not related to CME. In this...Go to contribution page
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Michal Petran (Czech Technical University (CZ))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterAlmost all charm in heavy ion collisions is produced in the hard 'first interaction' processes before partons thermalize into a drop of QGP. Charm survives the QGP evolution and as hadrons emerge in soft hadronization processes, practically every charm or anticharm quark turns into a charmed hadron, small fraction of the charm yield enters multi-charmed hadrons and charmonium states. We...Go to contribution page
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Peter Levai (Hungarian Academy of Sciences (HU))16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterThe charm quark production will be reasonably large at LHC energies, both in p+p and Pb+Pb collisions. In heavy ion collisions even quark coalescence channels will strongly influence the charmed baryon and meson production. Furthermore, the formation of an intense coherent gluon field in Pb+Pb collisions results in additional heavy quark-antiquark pairs. Thus the primary charm quark momentum...Go to contribution page
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Dr Alexandre Lebedev (Iowa State University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterMeasurement of different quarkonia states is a well known tool for study of hot and dense matter produced in heavy ion collisions. The PHENIX experiment at RHIC have successfully measured chi_c production in p+p and d+Au collisions at 200 GeV. The chi_c decays were reconstructed through their decays to J/Psi+gamma. Results from the 2006 p+p and 2008 d+Au datasets at 200GeV will be...Go to contribution page
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Mr Vasily Sazonov (University of Graz)16/08/2012, 16:00QCD at finite temperature and densityPosterThe question of the existence of a confining matter with restored chiral symmetry at low temperatures and large density has been studied within the confining and chirally symmetric model, assuming a rigid quark Fermi surface. However, in the confining matter near the Fermi surface quarks group into color-singlet baryons. Due to the interaction between quarks the quark Fermi surface gets...Go to contribution page
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Christian Wesp (Goethe Universität Frankfurt)16/08/2012, 16:00Correlations and fluctuationsPosterOne of today's main goals in high energy physics is the exploration of the phase diagram of nuclear matter. On the theoretical side, much effort has been put into the investigation of quantum chromodynamics (QCD), its phase diagramm and symmetries. An important property of the QCD Lagrangian is its approximate chiral symmetry in the light-quark sector. At low temperatures and density this...Go to contribution page
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Edward Shuryak (stony brook university)16/08/2012, 16:00Exploring the QCD phase diagramPosterFor about a decade it is known that topological fluctuations -- instantons -- are modified by the nonzero Polyakov line VEV and split into Nc dyons. By now there is extensive lattice literature confirming this fact and explaining certain observations by properties of such dyons, mostly at T=(1-2)Tc. This talk report the first direct simulations of the statistical mechanics of the...Go to contribution page
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Dr brijesh srivastava (Purdue University)16/08/2012, 16:00Exploring the QCD phase diagramPosterThe shear to viscosity ratios ($\eta/s$) are obtained for the QGP in the context of the Color String Percolation Model (CSPM) using data produced in Au-Au collisions at $\sqrt{s_{NN}}$ = 200 A GeV at RHIC and Pb-Pb at $\sqrt{s_{NN}}$ = 2.76 TeV at LHC \cite{per}. The experimental transverse momentum spectrum is used to measure the percolation density parameter $\xi$ in Au-Au collisions...Go to contribution page
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Kwangbok Lee (Losalamos National Laboratory)16/08/2012, 16:00Heavy flavor and quarkonium productionPoster$\Upsilon(1S+2S+3S)$ are measured in $d$ + Au and $p$ + $p$ collisions at $\sqrt{s_{NN}} $= 200 GeV by the PHENIX experiment in the di-muon decay channel at 1.2 < |y| < 2.2. Compared to the $J/\psi$, the $Upsilon$'s heavier mass makes it possible to study the nuclear effects on the gluon distribution in different kinematic regions than those probed by the $J/\psi$. The measured results...Go to contribution page
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Dr Armen Sedrakian (Frankfurt University)16/08/2012, 16:00QCD at finite temperature and densityPosterI discuss the structure and composition of massive (two solar-mass) neutron stars containing deconfined quark matter in color superconducting states. Stable configurations featuring such matter are obtained if the equation of state of hadronic matter is stiff above the saturation density, the transition to quark matter takes place at a few times the nuclear saturation density, and the...Go to contribution page
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Prof. Alexandru Jipa (Faculty of Physics, University of Bucharest)16/08/2012, 16:00Global and collective dynamicsPosterHeavy-ion collisions at relativistic energies ofer an unique opportunity to probe highly excited dense nuclear matter with properties very diferent from that of a hadron gas or ordinary nuclear matter in the laboratory. An interesting phenomenon at the kinetic freeze-out stage of the system evolution is the collective transverse expansion as it is entirely generated during the collision and...Go to contribution page
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Damian Reynolds (S)16/08/2012, 16:00Global and collective dynamicsPosterThe collective flow of charged hadrons emitted in heavy ion collisions can be characterized using the Fourier coefficient $v_2$ (elliptic flow), as well as with the higher order coefficients, $v_3$, $v_4$, etc, which result primarily from fluctuations in the initial conditions of the colliding nuclei.The latter is of paramount importance since it can provide insight on the hydrodynamic...Go to contribution page
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Stephen Horvat (Y)16/08/2012, 16:00Exploring the QCD phase diagramPosterThe observed suppression of high transverse momentum ($p_{T}$) hadrons in central Au+Au collisions at $\sqrt{s_{NN}}$ = 200GeV, expressed via the nuclear modification factor $R_{AA}$ ($R_{CP}$), is a clear indication of partonic energy loss due to the strongly-coupled medium created in heavy-ion collisions. That result is supported by high-$p_{T}$ triggered azimuthal di-hadron correlations...Go to contribution page
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Dr Irakli Garishvili (Lawrence Livermore National Laboratory)16/08/2012, 16:00Global and collective dynamicsPosterConstraining properties of the strongly interacting state of matter produced in relativistic heavy ion collisions at RHIC and LHC, such as eta/s and T_{init} is one of the biggest priorities in the field of heavy ion physics. For this purpose, we have developed CHIMERA, a framework for performing global statistical evaluation of multiple QGP signatures by comparing key soft observables...Go to contribution page
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Dr Thomas Hell (Technische Universität München)16/08/2012, 16:00Exploring the QCD phase diagramPosterRecently, the mass of the pulsar PSR J1614-2230 has been measured at a one-percent accuracy to be roughly two solar masses. This, in addition to the statistical analysis of neutron-star radii by Steiner, Lattimer, and Brown lead to tight constraints for the equation of state of dense baryonic matter inside the neutron star. We combine a realistic phenomenological equation of state at low...Go to contribution page
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Yi Wang (Department of Engineering Physics, Tsinghua University)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterData taken over the last several years have demonstrated that the Relative Heavy Ion Collider (RHIC) has created dense and rapidly thermalizing matter. The next objective at RHIC is to study properties of this partonic matter in detail in terms of color degrees of freedom and the equation of state. The precise measurement of transverse momentum distributions of quarkonia at different...Go to contribution page
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Prof. Yuanfang Wu (Institute of Particle Physics, CCNU, wuhan China)16/08/2012, 16:00Global and collective dynamicsPosterHigher cumulant ratios of conserved charges are suggested to be sensitive probe of QCD critical end point [1] in relativistic heavy ion collisions. Their behaviors at current relativistic heavy ion collisions are highly interested and studied intensively [2,3]. Before we draw the critical-like fluctuations from the measured higher cumulants, it is necessary to know what the contributions of...Go to contribution page
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Prof. Yuanfang Wu (Institute of Particle Physics, CCNU, Wuhan, China)16/08/2012, 16:00Global and collective dynamicsPosterHigher moments of net-baryon are suggested to be sensitive probe of QCD critical end point [1] in relativistic heavy ion collisions. Their critical fluctuations are highly interesting and instructive for the exploration of QCD phase diagram from both theoretical and experimental sides. According to the universality of critical behavior, the QCD critical end point, and the chiral phase...Go to contribution page
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Fiorella Fionda (Universita e INFN (IT))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe measurement of J/psi production in proton-proton collisions at the LHC energy regime allows to test QCD calculations. In addition, it provides the necessary reference for the ALICE Pb-Pb program. ALICE collected proton-proton collisions at sqrt{s} = 7 and 2.76 TeV in 2010 and 2011. In this talk, we present the latest results on J/psi production in proton-proton collisions, measured by...Go to contribution page
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Grazia Luparello (NIKHEF (NL))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe ALICE experiment at the Large Hadron Collider (LHC) has been designed in order to characterize the quark gluon plasma (QGP) in high-energy heavy-ion collisions. D mesons are powerful probes of the medium since the charm quarks are produced at the early stage of the collision and experience its entire evolution. In particular, the anisotropy parameter $v_2$ of D mesons is sensitive to the...Go to contribution page
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Sandro Bjelogrlic (University of Utrecht (NL))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterDue to their relatively high mass, heavy-flavour quarks, produced in high-energy heavy-ion collisions, are sensitive probes of the interaction dynamics inside the hot and dense QCD matter. Since heavy quarks are produced in pairs during the initial stage of the collision, before the formation of the QGP, the measurement of heavy-flavour hadron production provides profound information on the...Go to contribution page
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Chanaka De Silva (Wayne State University)16/08/2012, 16:00Correlations and fluctuationsPosterAngular di-hadron correlation studies in Au+Au collisions at 200 GeV have revealed a nearisde elongated structure in delta eta. This is often referred to as the ridge, and was found to extend to delta eta 9 units at the LHC. Using preliminary STAR data [3], we discuss methods to decompose 2D di-hadron correlations in Au+Au 200 GeV collisions on the nearside. Our analysis is performed as a...Go to contribution page
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Christoph Herold16/08/2012, 16:00Exploring the QCD phase diagramPosterWe study the nonequilibrium dynamics of a quark fluid coupled to a sigma field and a Polyakov loop near the QCD phase boundary. As the system evolves through the first order transition line, baryon density fluctuations are enhanced in comparison with an evolution through the crossover or the critical point.Go to contribution page
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Dr Juergen Eschke (GSI Helmholtzzentrum)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe Compressed Baryonic Matter (CBM) experiment will conduct a comprehensive research programme on nuclear matter at high net baryonic densities. The Silicon Tracking System (STS) is the central detector of the CBM experiment. Its task is the standalone trajectory reconstruction of the high multiplicities of charged particles originating from high-rate beam-target interactions. The detector...Go to contribution page
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Taku for the ALICE-FOCAL Collaboration Gunji (University of Tokyo (JP))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe W+Si electromagntic sampling calorimeter has been proposed as one of the upgrade plans for the LHC-ALICE experiment. The role of this calorimeter is to add capabilities to measure direct photons, pi0's and jets over full azimuth in a forward rapidity region (2.5<eta<4.5). The physics goal with the calorimeter is to understand the dynamics and properties of strongly interacting matter...Go to contribution page
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Deepali Sharma (S)16/08/2012, 16:00Electroweak probesPosterDi-electrons are among the most promising probes for studying the early, hot and dense stages created in relativistic heavy-ion collisions. They are color neutral and so interact only electromagnetically, thus carrying to the detectors information about the conditions and properties of the medium at the time of their creation. The di-electrons are emitted over the the entire...Go to contribution page
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Tatsuya Chujo (University of Tsukuba (JP))16/08/2012, 16:00JetsPosterA di-jet produced by a hard scattering of partons plays a vital role to characterize the properties of hot and dense QCD matter produced in Pb-Pb collisions at LHC. In particular, a di-jet is one of the key probes to look for a medium response due to a strong jet quenching effect, as reported by the CMS and ATLAS collaborations. In this analysis, we used the data collected by the ALICE...Go to contribution page
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Mr Patrick Huck (CCNU/LBNL)16/08/2012, 16:00Electroweak probesPosterIn the years 2010/11, the Solenoidal Tracker At RHIC (STAR) conducted a Beam Energy Scan (BES) over a wide range of center-of-mass energies with the purpose of studying the properties of the Quark-Gluon-Plasma (QGP) as well as searching for the onset of deconfinement and the critical point of the QCD phase diagram. The installation of the Barrel Time-Of-Flight-Detector (TOF) has enabled STAR...Go to contribution page
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Mr Florian Senzel (Goethe-Universität Frankfurt)16/08/2012, 16:00JetsPosterRecent experimental data measured in \sqrt{s}=2.76 TeV Pb+Pb collisions by ATLAS and CMS showed a significant imbalance in the transverse momenta of the two reconstructed jets with the highest transverse momenta. This momentum imbalance is assumed to be caused by the different energy and momentum loss of the di-jets by scatterings within the created medium. To investigate this momentum loss we...Go to contribution page
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Antonio Uras (Universite Claude Bernard-Lyon I (FR))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterThe ALICE experiment is dedicated to the study of the quark gluon plasma in heavy-ion collisions at the CERN LHC. The Muon Forward Tracker (MFT) is under consideration by the ALICE Experiment to be part of its programme of detectors upgrade to be installed during the LHC shutdown planned for 2018. The MFT is a silicon pixel detector added in the Muon Spectrometer acceptance ($2.5 < \eta < 4$)...Go to contribution page
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Nowo Riveli (O)16/08/2012, 16:00JetsPosterThe direct photon - hadron pair correlations serve as an excellent probe of the hot and dense medium created in the heavy ion collision at RHIC. The unmodified photon is used as a reference for the modification of the jet energy by the medium. The low cross section of QCD Compton scattering that produces direct photon - quark pairs added with the enormous production of the background photons...Go to contribution page
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Bikash Sinha (V)16/08/2012, 16:00New theoretical developmentsPosterWe have studied the effect of shear viscosity effects on direct photons as well as lepton pair production from Quark Gluon Plasma (QGP). The production rate for both these two thermodynamic signals gets modified due to: (i) changed space-time evolution of the viscous fluid and (ii) non-equilibrium correction to the equilibrium distribution function. The non-equilibrium correction grows with...Go to contribution page
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Sarah Campbell (I)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe proposed MPC-EX detector is a Si-W preshower extension to PHENIX's existing Muon Piston Calorimeter (MPC). The MPC-EX consists of eight layers of alternating W absorber and Si mini-pad sensors. Located at large rapidities, 3.1 < |$\eta$| < 3.8, the MPC-EX and MPC access low-x partons in the Au nucleus in d+Au collisions. With the addition of the MPC-EX, the neutral pion reconstruction...Go to contribution page
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Baldo Sahlmueller16/08/2012, 16:00JetsPosterDirect photons are a unique probe that allows studying the different stage of ultrarelativistic heavy-ion collisions. The direct photon yield is sensitive to different production mechanisms, which dominate the expected direct photon spectra at different transverse momenta. Their production is also influenced by modifications of the initial state in heavy nuclei. Such modifications can be...Go to contribution page
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Ekaterina Retinskaya (IPhT Saclay)16/08/2012, 16:00Correlations and fluctuationsPosterWe present the first extraction of the recently-proposed rapidity-even directed flow observable v1, obtained from an analysis of published two-particle correlation data from the ALICE Collaboration. An accounting of the correlation due to the conservation of transverse momentum restores the factorization seen in all other Fourier harmonics and thus indicates that the remaining correlation...Go to contribution page
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Gyulnara Eyyubova (University of Oslo (NO))16/08/2012, 16:00Global and collective dynamicsPosterDirected flow, v1, is measured over a wide range of pseudo-rapidity, |eta|<5.1, in Pb-Pb collisions at 2.76 TeV with ALICE at the LHC. The results of v1 are reported as a function of the pseudo-rapidity and the transverse momentum for different collision centrality classes. Using the neutral spectator deflection at beam rapidity we investigate both the rapidity asymmetric v1 which is...Go to contribution page
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Akihiko Monnai (The University of Tokyo)16/08/2012, 16:00Global and collective dynamicsPosterThe first results of the heavy ion program at LHC [1] suggest that the near-perfect fluidity discovered at RHIC is a universal property of the quark-gluon plasma (QGP) above and around the crossover temperature. The recent developments in hydrodynamic studies take account of the effects of shear and bulk viscosities as well as fluctuations for the quantitative understanding of the hot medium....Go to contribution page
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Pasi Huovinen (Johann Wolfgang Goethe-Universität)16/08/2012, 16:00Global and collective dynamicsPosterIn hydrodynamical modeling of the ultrarelativistic heavy-ion collisions the freeze-out is typically performed at a constant temperature. In this work we introduce a dynamical freeze-out criterion, which compares the hydrodynamical expansion rate with the pion scattering rate [1]. Previous studies [2] have shown that differences between constant temperature and dynamical freeze-out criteria...Go to contribution page
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Mr Zhiming Li (Institute of Particle Physics, CCNU, Wuhan, China)16/08/2012, 16:00Exploring the QCD phase diagramPosterHigher cumulants of baryon number are suggested to be good probe of Critical Point of QCD phase transition in relativistic heavy ion collisions [1]. However, since the number of produced protons is still small at RHIC, it is pointed out [2] that the statistical fluctuation is not negligible, and should be subtracted from directly measured cumulants. So the dynamical cumulant ratios are...Go to contribution page
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Mate Csanad (for the TOTEM Collaboration)16/08/2012, 16:00Exploring the QCD phase diagramPosterThe TOTEM experiment at LHC measured the differential cross-section of elastic p+p scattering at 7 TeV, with the help of Roman Pot detectors placed as close as seven times the transverse beam size from the outgoing beams [1]. Results indicate an initial exponential decrease of dsigma/dt, followed by a significant diffractive minimum at |t| = (0.53 +- 0.01(stat) +- 0.01(syst)) GeV**2. For large...Go to contribution page
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Hamza Berrehrah (Subatech)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterOne of the most advocated probes of the quark gluon plasma (QGP) properties is the $J/\psi$ suppression. However, the comparison between experimental data and theoretical scenarios is still rather inconclusive, as several mechanisms might participate to explain the observed suppression (sequential suppression, dynamical or statistical recombination, formation time,...), not to mention the cold...Go to contribution page
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Monika Sharma (Vanderbilt University (US))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe first measurements of the elliptic azimuthal anisotropy of neutral pions, pi0s, produced in 2.76 TeV PbPb collisions will be presented. The results are based on data collected by the CMS experiment during the 2010 LHC running period. The amplitudes of the second Fourier component (v2) of the pi0 azimuthal distributions are extracted using an event-plane technique. The values of v2 are...Go to contribution page
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Denise Aparecida Moreira De Godoy (Universidade de Sao Paulo (BR))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHeavy quarks, charm and bottom, are produced in early stages of heavy-ion collisions. Propagating through the created matter they serve as a probe of the dynamics of the strongly-interacting, hot and dense plasma of quarks and gluons (QGP). The transverse momentum dependence of the elliptic flow (v2) of heavy quarks is sensitive to the properties of the QGP. A non-zero v2 of low transverse...Go to contribution page
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Carlos Perez Lara (Nikhef, Utrecht University)16/08/2012, 16:00Correlations and fluctuationsPosterAnisotropic flow of identified particles provides important information about the properties of the matter created in a heavy-ion collisions.We report the elliptic flow of strange (K$^0_s$ $\Lambda$) and multi-strange ($\Xi$ $\Omega$) hadrons measured at mid rapidity (|eta|<0.8) in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV. The results are compared to measurements at RHIC energies and...Go to contribution page
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Maja Katarzyna Mackowiak-Pawlowska (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00Correlations and fluctuationsPosterNA61/SHINE at the CERN SPS is a fixed-target experiment pursuing a rich physics program including measurements for heavy ion, neutrino and cosmic ray physics. The main goal of the ion program is to explore the most interesting region of the phase diagram of strongly interacting matter. Within the expected (T - mu_B) interval we plan to study the properties of the onset of deconfinement and...Go to contribution page
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Dr Anar Rustamov (Frankfurt University)16/08/2012, 16:00Correlations and fluctuationsPosterThe study of event-by-event (e-by-e) fluctuations of chemical (particle-type) composition in high-energy nucleus-nucleus collisions is a helpful tool to pin-down the properties of strongly interacting matter. Indeed, according to theoretical calculations, the QCD critical point may be signalled by a characteristic pattern in the measured fluctuations. On the other hand, an incomplete particle...Go to contribution page
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Prof. Ricardo Rodriguez (Ave Maria University)16/08/2012, 16:00JetsPosterWe investigate the possibility of enhanced jet quenching in the vicinity of the critical temperature similar to the scenario proposed by Liao and Shuryak [PRL 102, 202302(2009)]. We discuss the consequences of the fact that the "shells" of such enhanced, critical quenching grow thinner as a function of the center-of-mass energy sqrt(s) of the collision. A systematic scan of jet quenching as a...Go to contribution page
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Hideaki Iida (Kyoto University)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterPossible thermalization mechanism in heavy-ion collisions is explored in classical Yang-Mills(CYM) theory with the initial condition of color-glass condensate with noise varied. We calculate the Lyapunov exponents and show that even a tiny noise triggers instability of the system and then a chaotic behavior sets in as described by the positive Lyapunov exponents, or Kolmogorov-Sinai(K-S)...Go to contribution page
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Dr Takashi Hachiya (RIKEN)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe production of heavy quarks is a powerful tool for investigating the dense partonic medium created in high energy heavy ion collisions. Due to their large masses, heavy quarks are mainly produced at the initial stage of the collisions. Therefore the heavy quark probes is sensitive to the full time evolution of the heavy ion collision. The PHENIX experiment measured the strong flow...Go to contribution page
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Anthony Robert Timmins (University of Houston (US))16/08/2012, 16:00Correlations and fluctuationsPosterThe large multiplicities at the LHC permit flow harmonics to be determined on an event by event basis in Pb+Pb collisions. We extract these harmonics from inclusive event by event di-hadron correlations, where the minimum track pT is larger than 0.15 GeV. Within a fine centrality bin, we find the correlation function varies substantially on an event by event basis, indicating large...Go to contribution page
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Dr Harri Niemi (University of Jyväskylä, Department of Physics)16/08/2012, 16:00Global and collective dynamicsPosterNowadays, relativistic dissipative fluid dynamics is a common tool to describe the space-time evolution of the quark-gluon plasma (QGP) created in ultrarelativistic heavy-ion collisions. The validity of the fluid-dynamical approach is experimentally confirmed by the fact that initial-state anisotropies are directly converted into nonvanishing (event-averaged) Fourier coefficients $\langle...Go to contribution page
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Koichi Murase (The University of Tokyo)16/08/2012, 16:00Global and collective dynamicsPosterTo investigate the physics of the strongly interacting system of quarks and gluons under extreme conditions, heavy-ion collision experiments are performed at Large Hadron Collider (LHC) and Relativistic Heavy Ion Collider (RHIC). One of the major discoveries is that elliptic flow v_2 was comparable with an ideal hydrodynamic prediction and, as a result, that a new paradigm of strongly...Go to contribution page
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Xu-Guang Huang (Institute for Theoretical Physics)16/08/2012, 16:00Correlations and fluctuationsPosterWe compute the electromagnetic fields generated in heavy-ion collisions by using the HIJING model. Although after averaging over many events only the magnetic field perpendicular to the reaction plane is sizable, we find very strong electric and magnetic fields both parallel and perpendicular to the reaction plane on the event-by-event basis. We study the time evolution and the spatial...Go to contribution page
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Stefan Thomas Heckel (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00Correlations and fluctuationsPosterResults on event-by-event fluctuations of the mean transverse momentum of charged particles measured by the ALICE experiment at the LHC are compared to different Monte Carlo approaches. For these studies pp collisions at $\sqrt{s}$~=~0.9, 2.76 and 7~TeV and Pb--Pb collisions at $\sqrt{s_{\rm NN}}$~=~2.76~TeV are used. The analysis is performed within $|\eta| < 0.8$ and $0.15 < p_{\rm T} < 2...Go to contribution page
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Christoph Mayer (Polish Academy of Sciences (PL))16/08/2012, 16:00Electroweak probesPosterThe strong electromagnetic fields generated in the collision of Pb ions at the LHC allow photon-photon and photonuclear interactions to be studied in a kinematic regime unexplored so far. The exclusive photoproduction of vector mesons was studied with the ALICE detector in ultra-peripheral PbPb collisions, where the impact parameter is larger than the sum of the nuclear radii and hadronic...Go to contribution page
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Kouji Kashiwa (RIKEN BNL Research Center)16/08/2012, 16:00Exploring the QCD phase diagramPosterWe investigate the nontrivial correlation between the chiral and deconfinement transition in the two-color QCD. To extract the information, the imaginary chemical potential is taken into account. At $\theta = \pi/2$ where $\theta$ is the imaginary chemical potential divided by the temperature, there is the exact nontrivial center symmetry which is the $Z_2$ symmetry and this symmetry can be...Go to contribution page
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Philipe Mota (Goethe Universität Frankfurt)16/08/2012, 16:00Global and collective dynamicsPosterIn this work, we propose a new ow correlation observable that provide valuable information about the geometrical properties of the QGP at the thermalization time. An event-by-event analysis within a longitudinal tube initial condition model shows that emitted particles high pt higher than 1 GeV are extremely sensitive to the level of granularity present in the initial conditions....Go to contribution page
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354. Fluctuating Hydrodynamics Confronts the Rapidity Dependence of Transverse Momentum FluctuationsSean Gavin (Wayne State University)16/08/2012, 16:00Global and collective dynamicsPosterInterest in the development of the theory of fluctuating hydrodynamics is growing [1]. Early efforts suggested that viscous diffusion broadens the rapidity dependence of transverse momentum correlations [2]. That work stimulated an experimental analysis by STAR [3]. We attack this new data along two fronts. First, we compute STAR’s fluctuation observable using the NeXSPheRIO code, which...Go to contribution page
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Taku Gunji (University of Tokyo (JP))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterWe report on the new design of a forward electromagnetic calorimeter (FoCal) to be placed in the pseudorapidity region of $2.5 < \eta < 4.5$, which is under consideration as an upgrade of the ALICE experiment at the CERN-LHC. The physics goals of including the calorimeter in the forward direction are to study outstanding fundamental QCD problems at low Bjorken-x values, such as parton...Go to contribution page
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Dr Sascha Vogel (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterOne of the fundamental objectives of experiments with ultra-relativistic heavy ions is the study of hadronic matter at high density and high temperature. In this investigation we study in particular the information which can be obtained by analyzing baryonic and mesonic resonances in both hadronic and leptonic decay channels. The decay products of these resonances carry information on the...Go to contribution page
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Dr Aneta Iordanova (University of California, Riverside)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterOne important theoretical model of heavy ion collisions expects that the collision zone can be divided into two distinct regions: the core and the corona. The corona region is a low density p+p or p+A like region which may be a more favorable for J/psi production as opposed to the hot, dense core. From a Glauber model, this region is found to be symmetric about the reaction plane in Au+Au...Go to contribution page
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Elena Petreska (Graduate Center/Baruch College CUNY)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterA scaling law for the multiplicity distribution in high-energy hadronic collisions has been proposed by Koba, Nielsen, and Olesen (KNO). Experiments at the LHC observed that multiplicities in the central region of proton-proton collisions follow a negative binomial distribution and that they do exhibit KNO scaling. The negative binomial distribution has been theoretically reproduced in the...Go to contribution page
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Paul Hohler (Texas A&M University)16/08/2012, 16:00QCD at finite temperature and densityPosterThe medium modifications of vector and axial-vector spectral functions are investigated using Weinberg and QCD sum rules in an attempt to establish chiral symmetry restoration. Such a study is essential for the interpretation of a pertinent signal from dilepton data in heavy-ion collisions. We start from vacuum spectral functions which include both ground- and excited-state resonances for both...Go to contribution page
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Oliver Fochler (Goethe-Universität Frankfurt)16/08/2012, 16:00Global and collective dynamicsPosterWe present fully dynamic simulations of central and non-central heavy ion collisions at LHC and at RHIC energies within the perturbative QCD-based partonic transport model BAMPS (Boltzmann Approach to Multi-Parton Scatterings). We focus on the simultaneous investigation of bulk properties, such as elliptic flow, viscosity and thermalization, and of high-pT observables, such as jet...Go to contribution page
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Prof. Masayuki Asakawa (Osaka University)16/08/2012, 16:00Correlations and fluctuationsPosterWe explore the relation between proton and nucleon numberfluctuations in the final state in relativistic heavy ion collisions. It is shown that the correlations between the isospins of nucleons in the final state are almost negligible over a wide range of collision energy. This leads to a factorization of the distribution function of the proton, neutron, and their antiparticles in the final...Go to contribution page
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Daisuke Watanabe (University of Tsukuba (JP))16/08/2012, 16:00JetsPosterHeavy-ion experiments at the highest beam energy in the world (Pb-Pb at sqrt(s_NN) = 2.76 TeV) have started in 2010 at the Large Hadron Collider (LHC) at CERN. At the LHC, jet production is more abundant than at RHIC. Jet measurements play a critical role not only for probing the hot and high energy density matter in heavy ion collisions through parton energy loss, but also to observe possible...Go to contribution page
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Dr Edouard Kistenev (Brookhaven National Laboratory)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe RHIC physics programs will benefit from developments in hadronic calorimetry. Hadronic calorimetry serves to identify and characterize jets in p+p and A+A collisions and enables studies of the mechanisms of partonic energy dissipation in the medium at high densities and temperatures. The sPHENIX detector concept requires development of a hadronic calorimeter with fairly high sampling...Go to contribution page
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Dmitri Kotchetkov (Ohio University (US))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe PHENIX detector was designed and built at the Relativistic Heavy Ion Collider to explore matter created in collisions of heavy nuclei. PHENIX, as an infrastructure of technologically different systems, has been recording data since 2000. Research results by the PHENIX experiment have already made an impact on the broad field of experimental nuclear physics. Being in its second decade of...Go to contribution page
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Sungtae Cho16/08/2012, 16:00Hadron thermodynamics and chemistryPosterWe study the absorption of hadronic molecules such as the X(3872) by pions and rho mesons during the hadronic stage of heavy ion collisions. We also investigate the possibilities of formation of hadronic molecules during different evolution stages of the hadronic phase. We show that the absorption cross section and its thermal average are strongly dependent on the structure and quantum number...Go to contribution page
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Mr Philip Rau (Goethe University Frankfurt, Germany)16/08/2012, 16:00Exploring the QCD phase diagramPosterWith an effective hadronic chiral flavor SU(3) model we investigate properties of QCD matter for a wide range of temperatures and baryochemical potentials. With our model, including all hadronic resonances up to masses of 2.6 GeV, we show that the strengths of the resonance couplings to the attractive scalar and the repulsive vector fields have a major impact on the order and location of the...Go to contribution page
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Francesco Becattini (Unversity of Florence), Mr Tim Schuster (Yale University (US))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterWe analyze hadrochemical freeze-out in central Pb+Pb collisions at CERN SPS energies, employing the hybrid version of the Ultrarelativistic Quantum Molecular Dynamics model, which describes the transition from a hydrodynamic stage to hadrons by the Cooper-Frye mechanism, and matches to a final hadron-resonance cascade. We fit the results both before and after the cascade stage using the...Go to contribution page
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George Moschelli (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00Correlations and fluctuationsPosterWe show that initial state fluctuations in concert with later-stage hydrodynamic flow describes a range of observables including both even and odd flow harmonics, the ridge, and multiplicity, momentum and flow fluctuations [1]. This is the first comparison between multiplicity and transverse momentum fluctuations and flow fluctuations in the same framework. The simultaneous investigation of...Go to contribution page
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Alex Mwai (Stony Brook University)16/08/2012, 16:00Correlations and fluctuationsPosterHBT measurements are sensitive to the expansion dynamics of the system and they can provide information on the size of the source in space and time at freeze-out (hadron decoupling). Previously, the size of the region of homogeneity has been shown to have an almost linear dependence with particle multiplicity at different beam collision energies. A question of interest is whether the same...Go to contribution page
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Gunnar Gräf (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00Correlations and fluctuationsPosterWe use the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) to explore HBT/Femtoscopic correlation in proton-proton and heavy ion collisions up to LHC energies. We discuss a) the scaling of HBT radii in proton-proton reactions at top LHC energies and b) the scaling of HBT radii from proton-proton to heavy-ion reactions from RHIC-BES to LHC energies for various systems. [1] G. Graef et...Go to contribution page
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Dr Daniel Kikola (Purdue University)16/08/2012, 16:00Global and collective dynamicsPosterHeavy quarks (charm and bottom) are produced early in the collisions and therefore are important probes of the hot and dense matter created in the reactions at RHIC energies. Electrons from semileptonic decays of heavy flavour mesons (so called non-photonic electrons, NPE) are the most feasible tool so far for studying heavy quarks in-medium interactions. NPE azimuthal anisotropy, $v_2$, is of...Go to contribution page
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Dr Sascha Vogel (Frankfurt Institute for Advances Studies)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterOne of the most promising probes to study deconfined matter created in high energy nuclear collisions is the energy loss of (heavy) quarks. It has been shown in experiments at the Relativistic Heavy Ion Collider that even charm and bottom quarks, despite their high mass, experience a remarkable medium suppression in the Quark Gluon Plasma. In this investigation we study the energy loss...Go to contribution page
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Sanghoon Lim (Yonsei University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe measurement of single muons from the semi-leptonic decay of D and B mesons is a well-developed method for the study of heavy quark production at forward rapidity. Previous PHENIX results from p+p and Cu+Cu collisions at sqrt(s) = 200 GeV have reported the suppression of heavy quark production in central Cu+Cu collisions at rapidity = 1.65. The measurement of heavy quark production at...Go to contribution page
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Mr Nirupam Dutta (Doctoral Student, Bielefeld University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterIn static picture a quarkonium bound state in deconfined medium is either completely dissociated above some threshold temperature or just stays in the specific state below the threshold. In contrast, some recent studies suggest that the static quark antiquark potential for describing bound quarkonia should include an imaginary part. This shows a finite life time of the bound state in the medium...Go to contribution page
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Dr Hendrik van Hees (Goethe University Frankfurt)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHeavy charm and bottom quarks provide an important probe of the transport properties of the quark-gluon plasma, created in heavy-ion collisions at the Large Hadron Collider (LHC). They are produced in the early hard collisions and then interact with the hot and dense medium, consisting of light quarks and gluons, undergoing a phase transition to a hot and dense hadron gas. Using a hybrid...Go to contribution page
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Prof. Feng Liu () College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, China)16/08/2012, 16:00Exploring the QCD phase diagramPosterOne of the most exciting goals for the field of high-energy nuclear collisions is to understand the phase structure of matter with partonic degrees of freedom especially the transition from hadronic phase to partonic phase, the quark-gluon plasma (QGP). It is believed that the QGP phase dominates the evolution briefly during the early time of the Universe. In high-energy nuclear collisions at...Go to contribution page
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Jan Cepila (Czech Technical University (CZ))16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterWe discuss a production of direct photons at large transverse momenta p_T in nuclear collisions at different energies and rapidities corresponding to RHIC and LHC experiments. Direct photons are very convenient tool for investigation of nuclear effects since they are not expected to be accompanied by any final state interaction, either energy loss or absorption. Therefore, besides the Cronin...Go to contribution page
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Norbert Novitzky (Helsinki Institute of Physics (FI))16/08/2012, 16:00JetsPosterNeutral-pion spectra were measured at midrapidity ($|y|<0.35$) in AuAu collisions at sqrt{sNN} = 39 and 62.4 GeV and compared to earlier measurements at 200 GeV in the $1<p_T<10$ GeV/c transverse-momentum (p_T) range. The nuclear-modification factors (RAA) show significant suppression and a distinct energy dependence at moderate p_T in central collisions. At high p_T, RAA is similar for...Go to contribution page
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amal sarkar (Indian Institute of Technology, Mumbai)16/08/2012, 16:00Exploring the QCD phase diagramPosterThe Relativistic Heavy-Ion Collider (RHIC) , at BNL, has started its beam energy scan program by colliding high energy heavy-ions corresponding to baryonic chemical potentials within the range of 20 - 550 MeV. One of the main goals of this beam energy scan program is to locate the critical point which is postulated to lie at the end of the phase transition boundary between...Go to contribution page
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NIHAR R SAHOO (Variable Energy Cyclotron Centre)16/08/2012, 16:00Exploring the QCD phase diagramPosterTo prob e the critical p oint (CP) of QCD phase transition, the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National Laboratory has undertaken the beam energy scan program, colliding high energy heavy-ions corresponding to baryonic chemical potentials within the range of 20 - 550 MeV. QCD based model calculations reveal that the correlation length of the system diverges at the CP....Go to contribution page
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Philipp Gubler (RIKEN)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterQuarkonia spectral functions at finite temperature are studied using QCD sum rules in combination with the maximum entropy method. This approach enables us to directly obtain the spectral function from the sum rules, without having to introduce any specific assumption about its functional form [1]. QCD sum rules incorporate finite temperature effects in form of changing values of...Go to contribution page
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Rone Andrade (Universidade de São Paulo USP)16/08/2012, 16:00Correlations and fluctuationsPosterIn this work we study how highly energetic jets affect the hydrodynamic evolution of the quark-gluon plasma in an event-by-event basis. This is done by the introduction of a source term [1] in the energy-momentum conservation equation that describes the evolution of inviscid hydrodynamics (with a realistic equation of state [2]). The source is parametrized in terms of the direction of the jet...Go to contribution page
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Guang-You Qin (Duke University/Wayne State University)16/08/2012, 16:00JetsPosterJets propagating through dense matter are modified due to the scattering between the patrons of the jet with the constituents of the medium. Such scattering leads to an exchange of momenta between the medium and the jet, and has components that are both parallel and perpendicular to the direction of jet propagation. These scatterings introduce both drag and diffusion, and also change the rate...Go to contribution page
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Dr Jan Steinheimer-Froschauer (Lawrence Berkeley National Laboratory)16/08/2012, 16:00Global and collective dynamicsPosterUsing hydrodynamics we explore the effects of the initial state, baryon stopping and baryon number transport on various observables such as spectra, elliptic flow and particle yields for heavy ion collisions at beam energies from sqrt{s_{NN}}=7.7 to 200 GeV. We find that observed phenomena such as the centrality dependent freeze out parameters as well as the apparent difference in...Go to contribution page
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Matthew Donald Steinpreis (Ohio State University (US))16/08/2012, 16:00Correlations and fluctuationsPosterFemtoscopic correlations allow one to measure the space-time characteristics of particle production thanks to the effects of quantum statistics for identical particles and final state interactions for both identical and non-identical particles. The main features of the femtoscopy measurements in heavy-ion collisions from SPS to RHIC and LHC are i) the increase of the correlation radii with...Go to contribution page
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Jonathan Bouchet (Kent State University), Joseph Vanfossen (Kent State University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHeavy flavor particles, due to their production at the early stages of a collision, are of interest to study the properties of the matter created in heavy ion collisions at RHIC. Previous measurements of $D$ and $B$ mesons at RHIC[1, 2] using semi-leptonic probes show a suppression similar to that of light quarks, which is in contradiction with theoretical models including only a gluon...Go to contribution page
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Prof. Ramona Vogt (LLNL and UC Davis)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterWe assess the theoretical uncertainties on the inclusive $J/\psi$ production cross section in the Color Evaporation Model using values for the charm quark mass, renormalization and factorization scales obtained from a fit to the charm production data [1]. We use our new results to provide improved baseline comparison calculations at RHIC. We also study the rapidity, $p_T$ and...Go to contribution page
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John Novak (M)16/08/2012, 16:00Correlations and fluctuationsPosterIt has been proposed that one signal of the critical point could be a non-monotonic change in the value of transverse momentum ( $p_t$ ) correlations as a function of centrality and/or incident energy [1]. Accordingly, we present results for two-particle $p_t$ correlations as a function of event centrality for Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV...Go to contribution page
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Dr Marlene Nahrgang16/08/2012, 16:00Heavy flavor and quarkonium productionPosterStrong jet quenching and high-pT hadron suppression as observed in relativistic heavy-ion collisions are striking experimental signatures for the formation of a deconfined QCD plasma, in which partons suffer from medium-induced energy loss. In particular, heavy quarks represent key probes for revealing the properties of the produced matter. In this talk, we discuss the consequences of a...Go to contribution page
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Liliana Apolinário (Universidade de Santiago de Compostela)16/08/2012, 16:00JetsPosterIn order to get information about the characteristics of the medium produced in high-energy heavy-ion collisions using reconstructed jets, the effect of background subtraction has to be well under control. In this study, we address this issue by embedding jets in a heavy-ion event and then considering the influence of the subtraction method and of different backgrounds, characterized by...Go to contribution page
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Dr Sascha Vogel (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterOne of the most promising probes to study deconfined matter created in high energy nuclear collisions is the energy loss of (heavy) quarks. Theoretically however there exist various ambiguities, which still need to be resolved. In this work we investigate the dependence on the medium description of heavy quark energy loss. We find that by only changing the theoretical medium description and...Go to contribution page
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Prof. Toshitaka Tatsumi (Department of Physics, Kyoto University)16/08/2012, 16:00Exploring the QCD phase diagramPosterRecently there has been much discussed the appearance of inhomogeneous chiral phases in the vicinity of the chiral restoration [1,2]. The critical end point should be the Lifshitz point, which properties have not been explored so much.Here we discuss an implication of inhomogeneous phase on cooling of hybrid stars. We consider the dual-chiral-density-wave (DCDW) specified by the spatially...Go to contribution page
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Ioannis Bouras (University of Frankfurt a.M.)16/08/2012, 16:00Global and collective dynamicsPosterThe initial conditions play a fundamental role in the fluid-dynamical modeling of the quark-gluon plasma (QGP) created in ultrarelativistic heavy-ion collisions. Many observables that are important in determining the properties of the QGP, such as elliptic flow (v2) and triangular flow (v3), appear to be generated mainly from the initial geometry of the energy density profile. Since the...Go to contribution page
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Dr Cesar L. for the PHENIX Collaboration Silva (Los Alamos National Lab)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe hydrodynamic behavior of the strongly interacting Quark-Gluon Plasma (QGP) has mostly been studied at mid-rapidity and important additional constraints on the longitudinal expansion of the medium are needed, in particular to help in constraining the initial state. The forward rapidity bulk medium initial state is also sensitive to low-x partons in one nucleus and high-x partons in the...Go to contribution page
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Kenta Shigaki (Hiroshima University (JP))16/08/2012, 16:00Electroweak probesPosterA very intense magnetic field is expected in non-central nucleus-nucleus collisions, and to reach ~ 10^14 T at the LHC energies. Not only being the strongest magnetic field in the Universe (cf. ~ 10^11 T on the surface of magnetars), various consequences of physics interests are in discussion, including chiral magnetic effects, synchrotron radiation, and non-linear behaviors of QED e.g....Go to contribution page
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Mr L. Chanaka De Silva (University of Houston)16/08/2012, 16:00Correlations and fluctuationsPosterTriggered di-hadron correlation studies using Au+Au collisions at #sqrt(S_{NN}) = 200GeV in STAR revealed a novel “ridge-like” structure in two dimensions (#Delta#eta, #Delta#phi) [1] for high p_{T} particles. Similar structure was also present in an inclusive un-triggered di-hadron correlation analysis [2]. We study the <p_{T}> evolution of un-triggered analysis by increasing the lower p_{T}...Go to contribution page
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Prof. Tomoki Endo (Division of Physics, Department of General Education, Kagawa National College of Technology, Japan.)16/08/2012, 16:00Exploring the QCD phase diagramPosterQuark matter is expected in the core region of neutron stars because of the central density is sufficiently high for nucleons to dissolve into quarks. The compact stars consist of not only nuclear matter but also hypeons and quarks, we call such stars "hybrid stars". However, the equation of state (EOS) is still not clear and many theoretical studies try to elucidate the EOS in the high...Go to contribution page
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Joshua Konzer16/08/2012, 16:00JetsPosterThe STAR results [1] from dihadron correlations as a function of the high-pt trigger azimuth relative to the event plane (phi_s) show a significant change from in-plane (phi_s~0) to out-of-plane direction (phi_s~90 degree). The near-side correlation is composed of two components: the jet-like correlation and the ridge; The former is found to be invariant over phi_s while the ridge is primarily...Go to contribution page
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Mauro Rogerio Cosentino (Lawrence Berkeley National Lab. (US))16/08/2012, 16:00Electroweak probesPosterPhotons are of great interest in relativistic heavy-ion collisions due to the fact that they do not interact strongly, and thus are used to make a tomographic view of those collisions. Of special interest are the directly produced high-transverse momentum photons. The ratio of their yield in Pb-Pb to pp collisions is sensitive to initial state effects. Furthermore, direct photons can...Go to contribution page
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Wangmei Zha (U)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe Relativistic Heavy Ion Collider (RHIC) is built to search for the Quark-gluon Plasma (QGP) and to study its properties in laboratory through high energy heavy-ion collisions. J/$\psi$ suppression in heavy-ion collisions due to color screening of quark and anti-quark has been proposed as a signature of QGP formation. But other mechanisms are likely to contribute to the observed J/$\psi$ in...Go to contribution page
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Marcel Araujo Silva Figueredo (Universidade de Sao Paulo (BR))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterJ/psi measurements can be performed with ALICE through the dilepton decay into electrons (for rapidity |y|<0.9) and muons (for rapidity -4.0<y<-2.5) pairs, in proton-proton, proton-nucleus and nucleus-nucleus collisions. J/psi measurements are very important in Pb-Pb as a probe of the Quark Gluon Plasma (QGP), in order to study mechanisms of suppression or regeneration. Proton-proton...Go to contribution page
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Thomas Lang16/08/2012, 16:00Heavy flavor and quarkonium productionPosterWe study charmonium physics in heavy-ion collisions within the framework of the non-equilibrium transport model UrQMD at SPS, RHIC and LHC energies. For pp collisions at LHC energies we find a considerable J/Psi suppression in dependence of the particle multiplicity.Go to contribution page
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Michal Vajzer (Acad. of Sciences of the Czech Rep. (CZ))16/08/2012, 16:00JetsPosterCollimated sprays of particles associated with hard partons, jets, are an important tool in testing QCD and probing the hot and dense nuclear matter created in high energy heavy-ion collisions. Jets enable to study hard scattering, fragmentation and hadronisation and their modification in presence of a partonic medium with respect to baseline vacuum measurements with proton-proton...Go to contribution page
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Dr J. Ali Hanks (PHENIX)16/08/2012, 16:00JetsPosterThe first stage of the sPHENIX upgrade focuses on the measurement of jet observables at RHIC energies. The enhanced acceptance and high rate capabilities of this upgrade allow for the measurement of a large set of jet observables, including dijet and gamma-jet properties, across a large kinematic range. The sensitivity of the proposed upgrade to the medium modification of such observables and...Go to contribution page
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Ying Lu (University of Maryland (US))16/08/2012, 16:00JetsPosterThe poster presents the jet response and inclusive pT spectra of jets reconstructed in PbPb collisions with the CMS detector at a center-of-mass energy of 2.76 TeV. The jets are found and reconstructed using both the calorimeters and the tracker system, through iterative cone and anti-kT algorithms, separately. The high-pT jet triggers and their efficiencies are studied for both PbPb and pp...Go to contribution page
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Di-Lun Yang (D)16/08/2012, 16:00JetsPosterThe AdS/CFT correspondence has been widely used to study the jet quenching of hard probes traveling in the strongly-coupled plasma. Nevertheless, in most of studies, the hard probes were assumed to be created at the late time within the thermalized medium. To understand the thermalization of the medium and its influence on high-energy probes generated in the early time in the strongly-coupled...Go to contribution page
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Dosatsu Sakata (University of Tsukuba (JP))16/08/2012, 16:00JetsPosterIn heavy-ion collisions, jet properties are expected to be modified by the interaction with the hot and dense medium. The modification is strongly related with properties of hot and dense matter and the study of jet properties is a versatile probe for the properties of the QGP. However, in heavy-ion collisions it is difficult to recover the jet quenching effects at small particle momentum due...Go to contribution page
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Pengfei Zhuang (Tsinghua University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterDifferent from the Jpsi yield which is almost identical at SPS, RHIC and LHC energies, the Jpsi transverse momentum distribution is sensitive to the nature of the medium and can be used to probe the quark-gluon plasma formation in heavy ion collisions. We calculated in a detailed transport approach the nuclear modification factor as a function of transverse momentum, the averaged transverse...Go to contribution page
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Hua Pei (University of Illinois at Chicago)16/08/2012, 16:00JetsPosterAngular correlations with respect to a back-to-back trigger pair of high-p_T hadrons with similar momenta (above 4 GeV/c) have shown no differences between d+Au and Au+Au collisions suggesting tangential emission of selected di-jets. In this talk we increase the p_T threshold of the leading hadron in the pair (8, 10 and 12 GeV/c) to vary the degree of the surface bias. The di-jet energy...Go to contribution page
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Akira Ohnishi (Kyoto University)16/08/2012, 16:00Correlations and fluctuationsPosterWe study Lambda-Lambda correlation in high-energy heavy-ion collisions based on the Lambda-Lambda interactions proposed so far. Lambda-Lambda interaction and the existence of H-dibaryon are long-standing problems in hadron physics. Since high-energy heavy-ion collisions at RHIC and LHC can be utilized as the exotic hadron factories [1], they would also provide information on exotic...Go to contribution page
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W.J. Llope (Rice University)16/08/2012, 16:00Global and collective dynamicsPosterIn the dense and high-temperature systems formed in relativistic heavy-ion collisions, final-state composites - light nuclei and antinuclei - are formed close to the freeze-out hypersurface. Their spectra, compared to those of the constituent (anti)nucleons, can be described by picturing the formation process as the coalescence of a number of nucleons that are close to each other in phase...Go to contribution page
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Sudipan De (Department of Atomic Energy (IN))16/08/2012, 16:00Global and collective dynamicsPosterMultiple parton interactions are expected to produce large long-range multiplicity correlations in high energy proton-proton and nucleus-nucleus collisions. Color glass condensate models explain the long range forward-backward (F-B) correlations by introducing strong color fields extended longitudinally in rapidity. Clustering of color sources also leads to F-B correlations. The measurement of...Go to contribution page
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Dr Huang Bingchu (Brookhaven National Lab)16/08/2012, 16:00Electroweak probesPosterAn enhancement of low-mass di-electron production which is compared to expected yields from known hadron sources was observed by the CERES experiment at CERN SPS in 158 A GeV central Pb+Au collisions (sqrt(s)=17.3GeV). More recently, NA60 reported their di-muon measurements in 158 A GeV In+In collisions. The enhancement of di-muon at $M_{\mu\mu} < 1$ GeV/$c^{2}$ can be described by a...Go to contribution page
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Frasher Loshaj (S)16/08/2012, 16:00JetsPosterWe address a recent puzzling result from the LHC: the jet fragmentation functions measured in $PbPb$ and $pp$ collisions appear very similar in spite of a large medium-induced energy loss (we will call this ``jet fragmentation scaling", JFS). To model the real-time non-perturbative effects in the propagation of a high energy jet through the strongly coupled QCD matter, we adopt an effective...Go to contribution page
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Emilia Leogrande (Universita e INFN (IT))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterLuminosity is an essential ingredient for the measurement of the cross section of physical processes. Luminosity determination in ALICE at the LHC is based on the visible cross sections measured in dedicated calibration experiments (van der Meer scans). Besides serving as reference for the determination of integrated luminosities, the cross sections measured in van der Meer scans can, with...Go to contribution page
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Edward Shuryak (stony brook university)16/08/2012, 16:00Exploring the QCD phase diagramPosterConfinement phenomenon for a long time was associated with Bose-Einstein condensation (BEC) of cirtain magnetic objects. In a series of previous works we had shown that it is indeed the case for lattice monopoles, which in pure gauge theory are about as numeroous near $T_c$ as gluons. We can now show that with increasing number of quark flavors to $N_f\sim 10$ the...Go to contribution page
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Ryohji (for the PHENIX collaboration) Akimoto (University of Tokyo)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHeavy quarks (charms and bottoms) are interesting probes with which to study the properties of quark gluon plasma (QGP). Heavy quarks are created by initial hard scatterings, and thus are good probe to investigate the full time evolution of heavy ion collisions. Due to their heavy mass, the energy loss within the QGP is expected to be different for heavy quarks than for light quarks....Go to contribution page
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Shawn Whitaker (Iowa State University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe suppression of quarkonia in heavy ion collisions has long been thought to provide an indication of the temperature dependent Debye screening length of color charge in the quark gluon plasma. A large sample of Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV have been collected by PHENIX in 2010. Using the PHENIX measurement of Upsilon production in p+p collisions as a reference, we will present...Go to contribution page
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Zubayer Ahammed (Department of Atomic Energy (IN))16/08/2012, 16:00Correlations and fluctuationsPoster\documentclass[prc,aps,nofootinbib,% tightenlines,superscriptaddress,floatfix, preprintnumbers]{revtex4} \usepackage{bbm} \usepackage{graphicx} \usepackage{amsmath} \usepackage{amsfonts,amsbsy} \usepackage{amssymb} \renewcommand{\thefigure}{\arabic{figure}} \newcommand{\ndyn}{\nu_{dyn}} \newcommand{\gc}{{\gamma-\mathrm{ch}}} \begin{document} \title{Measurement of energy...Go to contribution page
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Christoph Baumann (Johann-Wolfgang-Goethe Univ. (DE)), Markus Kohler (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))16/08/2012, 16:00Electroweak probesPosterDirect photons are an important probe of the hot and dense medium created in heavy-ion collisions because they do not interact with the medium and therefore carry information of all stages of the collision. At low momenta, thermal emission, which would provide the ideal measurement of temperature of the quark-gluon plasma, is expected to dominate over other sources of direct photons. However,...Go to contribution page
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Satyajit Jena (IIT- Indian Institute of Technology (IN))16/08/2012, 16:00Correlations and fluctuationsPosterCharge fluctuations are considered to provide a possible signature for the existence of the de-confined Quark Gluon Plasma phase (QGP). Charge fluctuations are sensitive to the number of charges in the system, thus the fluctuations in the QGP, with fractionally charged partons, are significantly different from those of hadron gas with unit charged particles. The study of charge fluctuations...Go to contribution page
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Satoshi Yano (Hiroshima University (JP))16/08/2012, 16:00JetsPosterThe $\omega$ meson is a promising probe to investigate the properties of the QGP. It is well known that the yield of high-p_t particles is suppressed in nucleus-nucleus collisions relative to that in pp collisions. The effect is attributed to the energy loss of the energetic parent partons traversing the created medium. Since $\pi^0$ and $\omega$ mesons have the same quark content (u and d),...Go to contribution page
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Tomasz Bold (AGH Univ. of Science amp; Technology, Krakow)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe results of the study of ultraperipheral (gamma-gamma and gamma-Pomeron) interactions are presented. The analysis was performed with the data recorded by the ATLAS experiment during LHC Pb-Pb run in year 2011. The data, taken at the beam energy of 2.75 TeV per nucleon, correspond to an integrated luminosity of 141/microbarn. Muon pairs, produced in pure electromagnetic two-photon...Go to contribution page
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Bernard Richard Hicks (Yale University (US))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHeavy quarks, being produced in the initial stages of heavy-ion collisions, provide an excellent probe for the properties of the quark-gluon plasma (QGP). The expected in-medium energy loss of quarks is predicted to have a mass-dependence; however, recent results indicate that heavy-quarks lose more energy than expected. The measurement of electrons from heavy flavor decays provides insight...Go to contribution page
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326. Measurements of anisotropic flow($v_n$, n=1,2,3,4) in Cu + Au collisions at 200 GeV from PHENIXDr shengli huang (PHENIX Collaboration)16/08/2012, 16:00Global and collective dynamicsPosterMeasurements of the anisotropic flow with different order harmonic coefficients ($v_n$, n=1,2,3,4) have played a pivotal role in the discovery of the strongly coupled quark-gluon plasma (sQGP) at RHIC. They are also important for the study of the viscous hydrodynamics and the extraction of the shear viscosity over entropy density ($\eta/s$). The anisotropic flow is strongly coupled with...Go to contribution page
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Sidharth Kumar Prasad (Wayne State University (US))16/08/2012, 16:00JetsPosterWe present results of a study of charged particle jet properties in pp collisions at $\sqrt{s}$ = 7 TeV using the ALICE detector. Jets are reconstructed using charged tracks at mid-rapidity with the anti-$\rm k_{t}$ [1] jet finding algorithm from FastJet. We will discuss the transverse momentum dependence of three jet properties: charged particle multiplicity, jet size, and...Go to contribution page
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Rongrong Ma (Yale University (US))16/08/2012, 16:00JetsPosterJet properties are expected to be modified in the dense, colored medium formed in Pb-Pb collisions at the LHC. To quantify such modifications, the measurement of reference distributions in pp collisions is essential. Jets are reconstructed from charged tracks measured in the ALICE central barrel, as well as the neutral energy measured in the Electromagnetic Calorimeter (EMCal). In this poster,...Go to contribution page
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Szymon Mateusz Pulawski (University of Silesia (PL))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterPreliminary NA61/SHINE results on π+, π-, K+, K-, p and pbar spectra in p+p interactions at 20-158 GeV/c will be presented. NA61/SHINE at the CERN SPS is a fixed-target experiment pursuing a rich physics program [1]. Thanks to its large acceptance and excellent particle identification capability NA61/SHINE is well suited for performing high-precision particle production measurements in p+p,...Go to contribution page
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Benjamin Bannier16/08/2012, 16:00Electroweak probesPosterPhotons are produced at all stages of a nuclear collision. Because of their extremely small interaction rate with the hadronic medium any information they carry about their production environment is accessible nearly undistorted in their final state. Photons are produced in hadronic decays, hard scatterings of initial state partrons, jet-photon conversions and from thermal radiation of...Go to contribution page
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Karoly Uermoessy (Hungarian Academy of Sciences (HU))16/08/2012, 16:00New theoretical developmentsPosterFor the description of hadronic spectra in high-energy nuclear reactions, it is essential to understand the process of hadronisation. However, hadron creation is still an unsettled matter from the theoretical point of view. In the talk, I show that hadron distributions inside jets (fragmentation functions) created in s^1/2 = 7 TeV (LHC) proton-proton [1] and also in high-energy...Go to contribution page
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Dr Daniel Kikola (Purdue University)16/08/2012, 16:00Global and collective dynamicsPosterAnisotropic flow, which arises from correlations to the common collision geometry, is sensitive to the early stage of the expansion of the medium created in relativistic heavy-ion collisions. Azimuthal anisotropy is measured by final state particle correlations and is thus contaminated by correlations unrelated to the common geometry (nonflow). The contamination of nonflow hampers further...Go to contribution page
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Dr Paul Stankus (Oak Ridge National Lab)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterThe large majority of observations made of high-energy heavy-ion collisions at RHIC and LHC have been within a narrow range at mid-rapidity. These have been greatly informative, of course; but they've provided a window only onto a central "slice" of the created medium, leaving the full 3-D picture of the collision as a relatively unexplored frontier. How the initially locally thermalized...Go to contribution page
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Jussi Auvinen (University of Jyväskylä)16/08/2012, 16:00JetsPosterA strong suppression of heavy-flavor hadrons has been seen in ultrarelativistic heavy ion collisions at BNL-RHIC and CERN-LHC. This surprising result has challenged the view of gluon radiation dominating over elastic 2-to-2 processes as a cause of parton energy loss in a quark-gluon plasma. To study the effectiveness of elastic collisions as the suppression mechanism in detail, we have...Go to contribution page
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Clint Young (McGill University)16/08/2012, 16:00JetsPosterJets have proven to be an important observable of heavy-ion collisions at the LHC; recent analysis has also made jets an important probe at RHIC energies as well. Unlike the spectrum of single hadrons, the spectrum of jets is highly sensitive to $\hat{q}_{\perp}$, as well as being sensitive to partonic energy loss and radiative processes. We use MARTINI, an event generator, to study how...Go to contribution page
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Prof. Jens Jorgen Gaardhoje (Niels Bohr Institute)16/08/2012, 16:00Global and collective dynamicsPosterWe discuss opportunities that may arise from subjecting high-multiplicity events in relativistic heavy ion collisions to an analysis similar to the one used in cosmology for the study of fluctuations of the Cosmic Microwave Background (CMB). To this end, we discuss examples of how pertinent features of heavy ion collisions including global characteristics, signatures of collective flow and...Go to contribution page
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Ms Dronika Solanki (University of rajasthan)16/08/2012, 16:00Global and collective dynamicsPosterThe main goal of the STAR experiment at Relativistic Heavy Ion Collider (RHIC) is to study the properties of the QCD matter at extremely high energy density and parton density, created in the heavy ion collisions. Photons are produced at all stages of the colliding system and through decay of produced particles like neutral pions. The multiplicity measurement of photons on an event-by-event...Go to contribution page
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Fengchu Zhou (Central China Normal University (CN))16/08/2012, 16:00Global and collective dynamicsPosterA central goal of the heavy-ion program at LHC is to study the properties of the quark-gluon plasma (QGP). The azimuthal anisotropy of particle production is a sensitive tool to study the features of the QGP. The anisotropy is typically characterized by $v_2$, the second harmonic coefficient of the Fourier series expansion of the particle azimuthal distribution with respect to the reaction...Go to contribution page
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Paraskevi Ganoti (Oak Ridge National Laboratory - (US))16/08/2012, 16:00JetsPosterIn this poster, $\pi^0$ and $\eta$ spectra in pp collisions at sqrt(s) = 7 TeV from the ALICE 2010 and 2011 runs (extended calorimeter acceptance) will be presented. The neutral mesons are reconstructed via their two photon decay channel where both photons are measured with the ALICE EMCal. For the ALICE 2011 run both, minimum bias and EMCal triggered data, have been analyzed. A precise...Go to contribution page
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Mr Matthias Drews (Technische Universitaet Muenchen)16/08/2012, 16:00Exploring the QCD phase diagramPosterRecently a two-solar-mass neutron star was observed. This puts new constraints on effective models at zero temperature and high chemical potential. In our approach we include mesonic degrees of freedom as well as nucleons in the framework of the Functional Renormalization Group. In this way, fluctuations beyond the mean-field approximation are taken into account.Go to contribution page
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Gyulnara Eyyubova (University of Oslo (NO))16/08/2012, 16:00Global and collective dynamicsPosterRecently significant effort is made to study azimuthal flow asymmetries in ultra-relativistic heavy ion reactions. At finite impact parameters the directed flow and the elliptic flow were dominant observables for many years. In head-on collisions there would be no reason to have an azimuthal or longitudinal asymmetry, nevertheless, new observations for the higher harmonics show [1] that...Go to contribution page
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Amaresh Jaiswal (Tata Institute of Fundamental research, Mumbai)16/08/2012, 16:00New theoretical developmentsPosterStarting with the relativistic Boltzmann equation where the collision term is generalized to include nonlocal effects, and using Grad's 14-moment approximation for the single-particle distribution function, we derive equations for the relativistic dissipative fluid dynamics. We compare them with the corresponding equations obtained in the standard Israel-Stewart and related approaches. Our...Go to contribution page
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Mr Risto Paatelainen (University of Jyvaskyla, Finland)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterThe EKRT model [1] which combines pQCD minijet production with the saturation of produced gluons and (ideal) hydrodynamics, has predicted the measured multiplicities in central A + A collisions both at RHIC and LHC remarkably well [2]. Also the published pT spectra of bulk hadrons (at RHIC) have been reproduced quite nicely [3]. We now bring this closed framework to NLO as rigorously as...Go to contribution page
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Erike Cazaroto (University of Sao Paulo)16/08/2012, 16:00Global and collective dynamicsPosterAt high energies the amount of gluons in a hadron is much larger than the amount of any other constituent, for example it is much larger than the amount of sea quarks. Therefore, at high energies the hadronic cross sections are basically a function only of the gluons distribution. The color dipole formalism applied to photon-photon collisions implies that, before interacting, each of the...Go to contribution page
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Dr Min He (Cyclotron Institute, Texas A&M University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterWe compute open heavy-flavor (HF) transport in relativistic heavy-ion collisions by combining a strong-coupling treatment in both macro- and microscopic dynamics (hydro and nonperturbative diffusion interactions) [1]. The hydrodynamic bulk evolution is quantitatively constrained by bulk and multi-strange hadron spectra and elliptic flow [2]. In the Quark-Gluon Plasma (QGP) phase, heavy-quark...Go to contribution page
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Mauricio Martinez Guerrero (Universidade de Santiago de Compostela)16/08/2012, 16:00New theoretical developmentsPosterRadiative interferences in the multiparton shower is the building block of QCD jet physics in vacuum. The presence of a QCD medium is expected to alter this interference pattern. We investigate color coherence effects in the medium modification to the initial state radiation in a simple setup which allows to include these effects in a clean way. We derive the medium induced gluon spectrum of...Go to contribution page
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Alexander Schmah (Lawrence Berkeley National Lab)16/08/2012, 16:00Global and collective dynamicsPosterThe RHIC Beam Energy Scan covers a wide range in the QCD phase diagram temperature vs. baryon chemical potential. A phase transition between the Quark Gluon Plasma and the hadron gas phase is expected in this region of the QCD phase diagram. The elliptic flow $v_{2}$ is one of the observables which is sensitive to the pressure gradients in the initial stage of heavy-ion collisions. Hence it...Go to contribution page
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Joshua Konzer16/08/2012, 16:00JetsPosterParticle production mechanisms vary with $p_T$. At low $p_T$ soft processes dominate whereas hard processes dominate at higher $p_T$. Experimental data has shown drastic change from d+Au to Au+Au collision in $p_T$ spectra, collective phenomena, and baryon/meson ratio at intermediate $p_T$. This indicates that the relative mixture of particles produced by hard and soft processes differ...Go to contribution page
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Anthony Robert Timmins (University of Houston (US))16/08/2012, 16:00Correlations and fluctuationsPosterThe large multiplicities at the LHC potentially permit azimuthal flow to be accurately determined on an event by event basis in heavy-ion collisions. I will discuss methods one can obtain full vn distributions from such measurements. In particular, any measurement of event-wise flow will be subject to statistical smearing, and I will review unfolding techniques to recover the true vn...Go to contribution page
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Fuming Liu (Central China Normal University)16/08/2012, 16:00Global and collective dynamicsPosterWe will address the possibility of QGP formation in pp at 7TeV and 14 Tev with given life scan and size of QGP based on quantitative model estimation and constrained with all available data at LHC from the four collaborations. Then discuss the possible QGP signals in pp collisions, which certainly differ to the QGP signals in AA collisions. To theoreticians: Most of you think QGP...Go to contribution page
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Tamal Kumar Mukherjee (Institute of High Energy Physics, TPCSF)16/08/2012, 16:00Hadron thermodynamics and chemistryPosterWe follow chiral effective model [1] of a quarkonia nonet and a tetraquark nonet as well as a complex iso-singlet (glueball) field to study the lowest lying scalar mesons on the basis of chiral symmetry and UA(1) symmetry. By virtue of the isospin symmetry, the isospin 1 and isospin 1/2 physical states are assumed to have two and four bare quark components whereas I = 0 physical scalar and...Go to contribution page
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Jan Uphoff (Goethe University Frankfurt)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe production and space-time evolution of heavy quarks and J/psi in the quark gluon plasma is studied within the partonic transport model Boltzmann Approach to MultiParton Scatterings (BAMPS). An updated version of BAMPS is presented which allows interactions among all partons: gluons, light quarks and heavy quarks. Heavy quarks, in particular, interact with the rest of the medium via binary...Go to contribution page
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Mr Hongxi Xing (Institute of Particle Physics, Central China Normal University)16/08/2012, 16:00JetsPosterWithin the framework of generalized collinear factorization in perturbative QCD (pQCD), we study the effect of initial multiple parton scattering and induced parton energy loss in Drell–Yan (DY) process in proton–nucleus collisions. We express the contribution from multiple parton scattering and induced radiative energy loss to the DY dilepton spectra in terms of nuclear modified effective...Go to contribution page
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Hidemitsu Asano (Kyoto Univ.)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory has been upgraded by installing a Silicon Vertex Tracker (VTX). The VTX has been developed for heavy flavor (charm and bottom) measurements and dedicated to precise tracking of primary and secondary vertices. Resolution of primary vertex reconstruction and distance of closet approach (DCA)...Go to contribution page
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Chi Yang (U)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterA larger area of muon telescope detector(MTD) at mid-rapidity will provide excellent muon identification and trigger capabilities at mid-rapidity in the high-luminosity era at RHIC. This novel and compact detector can provide crucial measurements for many exciting physics perspectives. We can measure different Upsilon states and J/psi over a broad transverse momentum range through di-muon...Go to contribution page
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Libor Skoda (Czech Technical University (CZ))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterWe present a performance study of a compact electromagnetic calorimeter meant to serve in a forward region (2 < eta < 4.5) in collider experiments in pp, pA and AA collisions. This kinematic region at LHC energies allows one to study very low Bjorken x physics. Measurement of direct photons in this region enables one to improve the precision of (nuclear) parton distribution functions. Our...Go to contribution page
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Pilar Staig (Stony Brook University)16/08/2012, 16:00Global and collective dynamicsPosterWe study the effect that perturbations and their propagation through the medium have in the final particle distributions of heavy ion collisions. Our work is constrained to central collisions only, where the medium can be described by the solution to conformally invariant hydrodynamics developed by Gubser and Yarom, which is a generalization of Bjorken flow where the boost-invariant medium...Go to contribution page
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Kyohei Fukuda (Nagoya)16/08/2012, 16:00Global and collective dynamicsPosterWe discuss the evolution of the fluctuation in the initial conditions of entropy densities (energy densities) using 1+1 dimensional hydrodynamic calculations. We explore not only the evolution of the fluctuation but also the origin of it. If the local thermal equilibrium is established at early time of the heavy ion collision and the mean free path of produced particles is...Go to contribution page
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Mr Abhisek Sen (Georgia State University)16/08/2012, 16:00Heavy flavor and quarkonium productionPoster$J/\psi$ production is considered as one of the very important probes for studying the properties of quark-gluon plasma (QGP). PHENIX observed a large suppression of $J/\psi$ production in Au+Au collisions at $\sqrt{s_{NN}}=$ 200 GeV in comparison with binary collision scaled p+p collisions. The level of this suppression is similar to that observed in other energies in CERN-SPS and LHC. ...Go to contribution page
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Lei Ding (I)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe measurement of azimuthal anisotropy $v_{2}$ of single electrons from semi$-$leptonic decay of open heavy flavor mesons in PHENIX experiment has provided important understanding of the property of the quark gluon plasma, especially the geometrical dependence of partonic energy loss. PHENIX results of $v_{2}$ in Au$+$Au collision at $\sqrt{s_{NN}}$=200GeV for heavy-flavor decays are...Go to contribution page
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Antonio Uras (Universite Claude Bernard-Lyon I (FR))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterStrangeness production provides one of the key observables to characterize the hot and dense state of strongly interacting matter produced in high-energy nuclear collisions. To access this information, ALICE measured phi meson production both in proton-proton and Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV in the dimuon channel, in the rapidity region 2.5 < y < 4. Thanks to these measurements,...Go to contribution page
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Mr Mukesh Mukesh Kumar Sharma (University Of Jammu)16/08/2012, 16:00Exploring the QCD phase diagramPosterThe study of phi meson and multi-strange production in heavy ion collision are the most interesting observables for exploring the new phase of matter named Quark Gluon Plasma. We will investigate the phi-meson and multi-strange production at FAIR energies using transport models like Ultra Relativistic Quantum Molecular Dynamics (UrQMD)[1] and A Multi Phase Transport Model (AMPT)[2]. The UrQMD...Go to contribution page
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Mr Guangyao Chen (Cyclotron Insitute and Department of Physics&Astronomy, Texas A&M University)16/08/2012, 16:00Electroweak probesPosterA new source of photon and dilepton emission from nuclear matter undergoing phase transition from partonic to hadronic degrees of freedom is studied. Electromagnetic radiation can be emitted when quark antiquark pairs recombine into pions and other hadrons. The photon and dilepton production rates are found to be comparable to those in quark gluon plasma and hadronic matter around the critical...Go to contribution page
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Dr Martin Purschke (BROOKHAVEN NATIONAL LABORATORY, for the PHENIX Collaboration)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe initial stage of the sPHENIX upgrade detector at RHIC will focus on the measurement of jet observables, such as gamma-jet properties, withhigh statistics over a large kinematic range. We have studied several key performance parameters of the envisioned electromagnetic calorimeter. In this poster we will present the studies of the photon identification in the presence of the particle...Go to contribution page
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Bing Xia (O)16/08/2012, 16:00JetsPosterDeuteron-gold collisions are essential to measure the cold nuclear matter effects, as well as help to interpret the heavy ion collision results to study the quark gluon plasma. Direct photons are less affected by the nuclear medium, thus, they can be used to infer the momentum of the scattered partons. Also, because of the prevalence of the Compton scattering in the direct photon events, the...Go to contribution page
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Pat Kenny (University of Kansas (US))16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterUltra-peripheral collisions (UPCs) of heavy ions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius. At TeV energies, the strong electromagnetic field due to the coherent action of the Z=82 proton charges generates a large flux of photons, which can be used for high-energy photoproduction studies. Heavy vector mesons (for example J/psi,...Go to contribution page
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Mr Yan Yang (Ohio State University)16/08/2012, 16:00Correlations and fluctuationsPosterCorrelations between non-identical particles at low relative momentum in the center of mass ($|\vec{k}^*|$) encode unique information on the space-time structure of the emitting system. In addition to size of the homogeneity region, analysis of correlation functions in the three- dimensional $\vec{k}^*$ space can reveal a space-time offset of one particle species (e.g. kaons) with respect...Go to contribution page
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Dr Dilan Madagodahettige Don (STAR (Creighton University))16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterUltraperipheral collision events are effectively photoproduction on nuclear targets. These events provide an ideal proving ground for new programs in e+A physics. For the first time, STAR has collected a large enough sample of rho mesons to study their diffractive interaction with Au nuclear targets in detail. The transverse momentum distribution of rho mesons is sensitive not only to the...Go to contribution page
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Dr Chin-Hao Chen (PHENIX Collaboration)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHeavy flavor quarks such as charm and bottom, provide important probes of the parton energy loss mechanism in quark-gluon plasma. By studying the single electrons coming from the single leptonic decays of D and B mesons, we can study the energy loss of charm and bottom. In order to study the heavy flavor energy loss process, a baseline comparison in p+p collisions where there is no...Go to contribution page
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Urs Wiedemann (CERN)16/08/2012, 16:00Global and collective dynamicsPosterWe formulate the propagation of fluid dynamic fields as a propagation of small perturbations around smooth average fluid fields. Fluid dynamic simulations of smooth average initial conditions are then shown to be sufficient to map out the large space of fluid dynamic event histories resulting from arbitrary small fluctuations around these smooth initial conditions. We argue that this provides...Go to contribution page
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Patrick Simon Reichelt (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe measurement of electron-positron pairs in the low invariant mass region allows to study the vacuum and in-medium properties of light vector mesons. Dielectrons also probe the production of thermal photons in heavy-ion collisions. ALICE is well-suited to perform this measurement due to its excellent tracking and particle identification capabilities at very low momenta. However, Dalitz...Go to contribution page
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Dr Zhi Qiu (Ohio State University)16/08/2012, 16:00Global and collective dynamicsPosterThe Quark-Gluon Plasma (QGP) created in heavy-ion collisions is well described by viscous hydrodynamic simulations. A key QGP transport coefficient, its specific shear viscosity eta/s, can be extracted by comparing such simulations with experimental data. Previous extractions gave (eta/s)_QGP ~ (1-2.5)/(4\pi) where the ~100% uncertainty arises mainly from ambiguities in the initial fireball...Go to contribution page
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Yukinao Akamatsu (Nagoya University)16/08/2012, 16:00New theoretical developmentsPosterSingle heavy quark system has been considered as a hard probe for dynamical information of quark-gluon plasma (QGP), namely drag force, while heavy quarkonium has been thought to probe static information, such as heavy quark potential. However, this intuitive picture is not correct, in particular for the latter. Recent theoretical developments have shown that dynamical feature is also...Go to contribution page
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Kazuhiro Watanabe (The University of Tokyo)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterWe study the parton saturation effects on heavy quark production in proton-nucleus collisions at collider energies, using the CGC formula proposed by Blaizot-Gelis-Venugopalan (Nucl.Phys.A743:57-91,2004). Previously it was numerically evaluated using the unintegrated gluon distribution from the McLerran-Venugopalan model including the x-evolution effect with the Balitsky-Kovchegov...Go to contribution page
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Huichao Song (The Ohio State University)16/08/2012, 16:00Global and collective dynamicsPosterViscous hydrodynamic calculations have shown that the quark-gluon plasma (QGP) shear viscosity can be extracted from elliptic and triangular flow data [1]. However, strong non-equilibrium effects, both in the chemical composition and the kinetic evolution, during the hadronic stage influence the development and distribution of flow anisotropy and must be correctly accounted for when extracting...Go to contribution page
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Marzia Rosati (Iowa State University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe PHENIX collaboration is in the process of developing an ambitious upgrade plan (called sPHENIX) to significantly improve physics capabilities and make use of the full enhanced luminosity at RHIC. The sPHENIX design contains silicon tracking, electromagnetic and hadronic calorimetry with large kinematic coverage and high data rate capabilities to sample 50 billion Au+Au collisions...Go to contribution page
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Mr Deke Sun (Purdue University)16/08/2012, 16:00JetsPosterThere has been a lot of interest in testing radiative energy loss calculations against data from RHIC and the LHC. It is customary, as in the Gyulassy-Levai-Vitev (GLV) approach, to formulate the energy loss of a jet parton as a line integral from the production point along a straight-line trajectory. Calculations then account for variations in path length with jet origin and direction, and...Go to contribution page
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Boris Tomasik (Univerzita Mateja Bela (SK))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterA Monte Carlo event generator REGGAE is presented which can generate momenta for given set of particles so that total energy and momentum assumes a pre-set value. The generator is proved to fill the available phase-space uniformly. In comparison to other algorithms it is considerably more effective in situations where many particles are produced and/or large part of the total energy is stored...Go to contribution page
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Prof. Rolf Scharenberg (Purdue University)16/08/2012, 16:00QCD at finite temperature and densityPosterThe major challenge in heavy ion physics is to extract the equation of state and the shear viscosity to entropy ratio $\eta/s$ from the data. In the clustering of color sources (CSPM) the charged particle transverse momentum spectrum is used to measure the percolation density parameter $\xi$, which determines the initial temperature T, energy density $\epsilon$, and the $\eta/s$ ratio versus T...Go to contribution page
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Koichi Murase (The University of Tokyo)16/08/2012, 16:00Global and collective dynamicsPosterTo investigate the physics of the strongly interacting system of quarks and gluons under extreme conditions, heavy-ion collision experiments are performed at Large Hadron Collider (LHC) and Relativistic Heavy Ion Collider (RHIC). One of the major discoveries was that elliptic flow v_2 was comparable with an ideal hydrodynamic prediction and, as a result, that a new paradigm of strongly...Go to contribution page
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Bikash Sinha16/08/2012, 16:00New theoretical developmentsPosterThe conventional scenario to date of the quark hadron phase transition in the microsecond old universe is essentially guided by lattice calculation leading to a cross over from quarks to hadrons. However, it is entirely possible that Affleck – Dine mechanism of baryogenesis leading to a large baryon asymmetry is more natural than in other models along the route baryogenesis via...Go to contribution page
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Martin Schulc (Czech Technical University (CZ))16/08/2012, 16:00JetsPosterWe perform (3+1)-dimensional ideal hydrodynamic calculation with source terms that describe energy and momentum deposition of hard partons in static quark-gluon plasma and study not only QGP response to one parton, but also interplay of perturbations due to two leading particles propagating in various directions. Energy deposition is described by a simple Bethe-Bloch model which leads to an...Go to contribution page
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385. Results from Fixed-Target Collisions from STAR: Au+Al at $\root{S_{NN}}$ = 4.5, 3.5 and 3.0 GeVBrooke Haag (U)16/08/2012, 16:00Exploring the QCD phase diagramPosterThe RHIC Beam Energy Scan (BES) was proposed to search for the possible critical point and to study the nature of the phase transition between hadronic and partonic matter. However, several dynamical model simulations (UrQMD, PHSD, QGSM, GiBUU, 3-fluid) suggest that the partonic phase is entered for center-of-mass collision energies as low as 4-5 GeV [1]. Collisions between beam halo...Go to contribution page
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Dr Supriya Das (Bose Institute)16/08/2012, 16:00Global and collective dynamicsPosterRecent data from LHC has revived the question whether the matter produced in high energy hadronic collisions is thermalized or not. With the published data from ALICE and CMS experiments, we have shown that the multi-particle production in p+p collisions at LHC energies available up to now, follows the scaling of information entropy if one takes the chaotic and coherent sources of particle...Go to contribution page
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Giorgio Torrieri (JW Goethe Universitat, Frankfurt)16/08/2012, 16:00JetsPosterIn this talk we show that azimuthal harmonics of hard particles, thought to be generated via parton energy loss, should scale differently w.r.t. multiplicity and system size to azimuthal harmonics of soft particles, thought to be generated by hydrodynamic response. By scanning harmonics in both energy and system size, we obtain a way of determining the domain of validity of...Go to contribution page
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Prof. Fotis Diakonos (University of Athens, Physics Department, Section of Nuclear and Elementary Particle Physics, GR-15771), Nikolaos Davis (University of Athens (GR))16/08/2012, 16:00Exploring the QCD phase diagramPosterWe perform factorial moment analysis in the transverse momentum space of protons produced at midrapidity in A+A collisions at the NA49 experiment (SPS, CERN). After background subtraction we find power-law dependence of the correlator on the number of phase space cells for the systems Si+Si and Pb+Pb at 158A GeV with large values of the associated characteristic exponent (intermittency...Go to contribution page
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Michal Petran (Czech Technical University (CZ))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterSoft hadron production at LHC energies presented a new challenge for the statistical hadronization mode (SHM). We show that the SHARE chemical nonequilibrium model describes well the available hadron yield data. We than extend SHARE to include CHARM contribution to hadron yields and present a remarkably accurate description of hadron yields at energy s_{NN} =2.76 TeV for several high ...Go to contribution page
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Dr Nasser Demir (Kuwait University)16/08/2012, 16:00Hadron thermodynamics and chemistryPosterWe present a detailed comparison between two different methods to calculate the shear viscosity coefficient for a set of four hadronic systems. One calculation employs the Chapman-Enskog method to calculate the shear viscosity coefficient for a hot hadronic system. The other calculation uses the Green-Kubo method to calculate the shear viscosity for a hadronic medium simulated using the...Go to contribution page
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Robert Lang (TUM)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterCollision experiments with heavy ions at RHIC and CERN help to explore the nature of the deconfined quark-gluon phase. The matter created in such collisions behaves as an almost-perfect fluid indicated by very small dissipative effects. We use the two-flavor NJL model to approximate the QCD physics at high temperatures $T\gtrsim 200\,\text{MeV}$. A large-$N_c$ expansion is applied to include...Go to contribution page
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101. Signature of liquid-gas phase transition and critical behavior in projectile multifragmentationMs Rupalim Talukdar (Department of Physics, Gauhati University, India)16/08/2012, 16:00Correlations and fluctuationsPosterA high-statistics exclusive study of the multifragmentation of Mg-Em interaction at 4.5 AGeV has been performed to realize the critical behaviour. A number of relevant observables such as fluctuation in the sizes of the largest cluster, reduced variance and the mean value of second moment of charge distribution were estimated with the experimental data. The observed results are compared...Go to contribution page
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601. Silicon pixel and strip detector development for the upgrade of the ALICE Inner Tracking SystemGiacomo Contin (Universita e INFN (IT))16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe main physics motivation for the upgrade of the Inner Tracking System of the ALICE experiment is to perform new measurements on charm and beauty production in heavy-ion collisions, dealing with the challenge of expected Pb-Pb interaction rates of up to 50 kHz. For this purpose, a new silicon tracker is needed with greatly improved features in terms of determination of the distance of...Go to contribution page
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Jiayin Sun (Stony Brook University)16/08/2012, 16:00Electroweak probesPosterDielectron spectra in Au+Au collisions carry important information on the properties of the hot dense matter created in the early stage of the collisions. The earlier PHENIX measurement, using data taken in 2004 shows significant deviations from hadronic decay expectations. The most recent data set from 2010, taken with the the Hadron Blind Detector (HBD) upgrade designed to reduce the...Go to contribution page
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Nicole Apadula16/08/2012, 16:00Heavy flavor and quarkonium productionPosterSince heavy flavor quarks are produced early in the collision, they experience the full evolution of the medium and are thus a good probe of medium effects. Electrons from open heavy flavor have previously been measured for p+p, Au+Au and d+Au collisions at the Relativistic Heavy Ion Collider (RHIC) by PHENIX. In the most central Au+Au the yield is suppressed relative to a Ncoll scaled p+p...Go to contribution page
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Mr Raktim Abir (Saha Institute of Nuclear Physics)16/08/2012, 16:00JetsPosterMost of the the calculations on gluon emission off a heavy quark, within perturbative QCD, have been performed in the literature using light cone gauge with eikonal approximations. Recently we revisited the issue in Feynman gauge that resulted in a very compact and elegant expression for the suppression factor for gluon emission off a heavy quark [1]. This generalization is valid for the full...Go to contribution page
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Dhevan Raja Gangadharan (Ohio State University (US))16/08/2012, 16:00Correlations and fluctuationsPosterQuantum coherence is fundamental in the interpretation of geometrical information from HBT measurements. The effect of quantum coherence is not only to lower the correlation strength of HBT correlations but also to modify the shape. We present measurements of the source chaoticity from Pb+Pb sqrt(s) = 2.76 TeV collisions at the LHC using the ALICE detector. Three-pion and two-pion correlations...Go to contribution page
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Björn Bäuchle (FIAS Frankfurt)16/08/2012, 16:00Electroweak probesPosterPhotons, as all electromagnetic probes, can give direct access to the hot and dense phase of a heavy-ion reaction. We show calculations of direct photon emission at highest energies available with the UrQMD-hybrid model. UrQMD is a full microscopic+macroscopic transport/fluiddynamics hybrid model with hadron- and string-driven equilibration phase, a fll (3+1)-dimensional fluiddynamic hot and...Go to contribution page
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Prof. Sanjay Ghosh (Bose Institute)16/08/2012, 16:00Global and collective dynamicsPosterCollective flow is an essential component in describing the dynamics of relativistic heavy ion collisions. The flow characteristics are intimately related to the equation of state of the thermally equilibrated matter created in these collisions through the speed of sound. Using either the Bjorken or Landau hydrodynamics or a combination thereof it is possible to relate the particle yields to...Go to contribution page
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Anne Sickles (Brookhaven)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterReconstructed jets in heavy ion collisions are a crucial tool for understanding the quark-gluon plasma. The separation of jets from the underlying event is necessary, particularly in central heavy ion collisions, in order to quantify medium modifications of the parton shower. Here, we describe a method for quantifying the underlying event contributions in Au+Au collisions at...Go to contribution page
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Prof. Jamie Nagle (University of Colorado)16/08/2012, 16:00JetsPosterThe PHENIX Experiment is proposing an exciting suite of upgrades called sPHENIX, with a first stage including a world class jet detector with full electromagnetic and hadronic calorimetry capable of sampling up to 50 billion Au+Au collisions annually and measuring jets over a broad kinematic range and with high statistics (over 10 million jets above 20 GeV and over 100,000 jets above 40 GeV)....Go to contribution page
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Dr Hiroshi Masui (LBNL)16/08/2012, 16:00Global and collective dynamicsPosterElliptic flow $v_2$ is one of the key observables to study the bulk properties at freeze-out as well as hadron production mechanisms in the ultra relativistic heavy ion collisions. It has been observed that number of constituent quark (NCQ) scaling of $v_2$ holds among measured identified hadrons at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV in Au + Au collisions at RHIC. The scaling of $v_2$ strongly...Go to contribution page
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Cesar Luiz da Silva (L)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe Forward Vertex Detector (FVTX) was installed in PHENIX this year and operated during the $\sqrt{s}=$510 GeV $p$+$p$, $\sqrt{s_{NN}}=$193 GeV U+U, and $\sqrt{s_{NN}}=$200 GeV Cu+Au runs. The FVTX has full azimuthal coverage between 1.2$<|y|<$2.2 and consists of 4 stations with 2 planes of silicon mini-strips with 75 $\mu$m pitch in the radial direction and 96 azimuthal segments. The...Go to contribution page
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Bikash Sinha16/08/2012, 16:00New theoretical developmentsPosterThe universe is assumed to begin with a large baryonic chemical potential acquired through an Affleck – Dine mechanism, which leads on to a baryon asymmetry of 0(1) without requiring superhigh temperatures. However, the observed baryon asymmetry of 0(10-10) at CMB temperature needs to emerge naturally from such a scenario. This is what could be achieved through a “little inflation” of about 7...Go to contribution page
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Sener Ozonder (University of Minnesota)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterWe consider a modified version of the McLerran-Venugopalan model where the thickness of the nucleus is finite and infrared divergences are removed by the color neutrality condition. The strong coupling constant and the nucleon size are treated as parameters. To determine these parameters, the x-dependent gluon distribution function is calculated at very low momentum, which is the region of...Go to contribution page
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Laura Patel16/08/2012, 16:00Heavy flavor and quarkonium productionPosterProduction of open bottom (B) mesons is an important tool to probe the hot and dense matter created from nucleus-nucleus collisions at the Relativistic Heavy Ion Collider (RHIC). In the mass region between 4.5 and 12 GeV, the only source of correlated like-sign dimuons will come from the semileptonic decay of B meson pairs. The number of correlated like-sign dimuons due to neutral B meson...Go to contribution page
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Bhanu Sharma (Panjab University)16/08/2012, 16:00Correlations and fluctuationsPosterThe STAR experiment at Relativistic Heavy Ion Collider (RHIC) investigates the behaviour of strongly interacting matter at high density and searches for the possible formation of Quark Gluon Plasma (QGP). Event-by-event net charge fluctuation has been proposed as one of the indicators of QGP formation in heavy ion collisions. The fluctuation in net charge depends on the squares of the charges...Go to contribution page
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Ms Neha Shah (University of California Los Angeles)16/08/2012, 16:00Correlations and fluctuationsPosterThe production of large number of multi-strange hyperons per central nucleus-nucleus collision at RHIC allows us to study hyperon-hyperon interactions through measurement of particle correlations and search for exotic particles like dihyperons. In 1977 Jaffe[1] predicted a six quark state, $H_{0}$-dibaryon, with hypercharge (Y) = 0 and Strangeness (S) = -2 to be stable against strong decay,...Go to contribution page
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Sanshiro for the PHENIX experiments Mizuno (University of Tsukuba, RIKEN (JP))16/08/2012, 16:00Global and collective dynamicsPosterAzimuthal anisotropy and particle species dependence of transverse momentum distribution have been studied actively because they reveal information about the QGP generated in high energy heavy ion collisions. From the study of elliptic event anisotropy v_{2}, we have understood that azimuthal anisotropy is generated by initial participant geometry, with a role for the QGP property $\eta$/s...Go to contribution page
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Dr Kun Liu (Los Alamos National Laboratory)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterE906/SeaQuest is a fixed-target experiment operated at Fermi National Accelerator Laboratory. Using the 120 GeV proton beams from the Main Injector, E906/SeaQuest measures the Drell-Yan production in the dimuon mass region of 4-8 GeV in p+p and p+A collisions over a wide xF range. Parton energy loss in QGP is considered as the dominant mechanism of the observed jet-quenching phenomena at RHIC...Go to contribution page
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Tinku Sarkar - Sinha (Saha Institute of Nuclear Physics (IN))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterThe high energy density reached in pp collisions at LHC could be comparable with the energy density for heavy–ion collisions at lower energies (i.e. Au-Au collisions at RHIC) and it might lead to the observation of collective phenomena. The multiplicity of the collision can be used as the “centrality” variable in pp collisions at LHC. In particular, the LHC provided p-p collisions at √s =...Go to contribution page
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Min Jung Kweon (Ruprecht-Karls-Universitaet Heidelberg (DE))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHeavy quarks are expected to be a probe providing new constraints on partonic energy loss mechanisms in the medium produced in heavy-ion collisions at the LHC. In particular, the medium-induced parton energy loss is expected to depend on its mass and colour charge. The measurement of heavy quark production in pp collisions provides an important test of pQCD calculations and serves as a...Go to contribution page
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Tomas Aronsson (Yale University (US))16/08/2012, 16:00Heavy flavor and quarkonium productionPosterHigh-energy heavy-ion collisions at the LHC allow for the study of the properties of the quark-gluon plasma (QGP). Heavy quarks, charm and bottom, produced in the initial hard scattering processes of the collision are excellent probes of the QGP. When heavy quarks traverse the QGP they are expected to lose energy and such energy loss is predicted to be smaller than for gluons and light...Go to contribution page
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Dr Umme Jamil Begum (Debraj Roy College, Golaghat, Assam, India)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterCharm quarks/antiquarks produced in the initial stage of heavy ion collisions, would traverse the quark gluon plasma, colliding with quarks and gluons and radiating gluons before appearing as D-mesons. Thus the final spectra of D-mesons would contain information of the medium modification suffered by the charm quarks/antiquarks. We have made a detailed study for the nuclear modification factor...Go to contribution page
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Sooraj Krishnan Radhakrishnan (State University of New York (US))16/08/2012, 16:00Global and collective dynamicsPosterThe anisotropy associated with the initial dipole asymmetry in heavy ion collisions is studied via the first harmonic coefficient $v_{1,1}$ of the two-particle azimuthal angle correlations, within AMPT and HIJING model (AMPT is essentially HIJING + parton/hadron transport). For a broad selection of centrality, transverse momenta and pseudorapidity ($\eta$), a fitting method is used to...Go to contribution page
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Mr Dustin Hemphill (Purdue University)16/08/2012, 16:00Global and collective dynamicsPosterWe employ a grid based stochastic technique to solve the on-shell Boltzmann transport equation including inelastic 3<->2 processes. The case of an interacting massless partonic gas in a longitudinally expanding Bjorken geometry is considered. The numerical accuracy of the algorithm is first rigorously established from comparisons to both static box calculations and earlier results from the...Go to contribution page
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Dr Hanzhong Zhang (Institute of Particle Physics, Central China Normal University)16/08/2012, 16:00JetsPosterThe effect of initial fluctuations on partonic jet energy loss in a hydrodynamical background in high-energy heavy-ion collisions is studied within a next-to-leading order (NLO) perturbative QCD parton model. An energetic parton jet is found to lose more energy loss with fluctuating initial conditions than that with smooth initial conditions due to initial dominative positive correlation...Go to contribution page
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Jinfeng Liao (Indiana University & RIKEN BNL Research Center)16/08/2012, 16:00New theoretical developmentsPosterOne of the main discoveries at RHIC is the strongly coupled quark-gluon plasma (sQGP), based particularly on the observed "perfect fluid" and strong jet quenching. One of the most interesting physics to see at LHC is whether and how such sQGP properties will change. Based on the deep and generic electric-magnetic duality, we've suggested that the QCD plasma contains the quarks and gluons...Go to contribution page
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Mr Hiroshi Nakagomi (Univ. of Tsukuba)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterIn heavy-ion collisions, measurement of azimuthal anisotropy in emitted particle momentum distribution is a one of the important themes for the investigation of Quark Gluon Plasma (QGP). For this measurements, we need to be able to measure the reference reaction/event planes direction with good accuracy. In 2011 the Silicon Vertex detector (VTX) was installed in the RHIC-PHENIX...Go to contribution page
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Michael Winn (Ruprecht-Karls-Universitaet Heidelberg (DE))16/08/2012, 16:00Exploring the QCD phase diagramPosterWe investigate the impact of interactions in the hadron resonance gas (HRG) modelled by a volume assigned to the hadrons in a thermodynamically consistent way. We discuss the influence of the hadron radius, a parameter of the model, on thermodynamic quantities as energy density, entropy density and pressure. The consideration of interactions is followed by us arguing that the commonly used...Go to contribution page
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Matthew Lamont (BNL)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterOver the last decade, there has been a plethora of new and exciting results in heavy-ion collisions emanating from the CERN and Brookhaven Laboratories. These results have led to a sea change of the view on how the evolution of a high energy heavy-ion collision proceeds. What has become apparent is that in order to validate claims of perfect fluidity, for example, the initial conditions at...Go to contribution page
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Tobias Tischler (Goethe-Universität, Frankfurt)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe Compressed Baryonic Matter Experiment (CBM) is one of the core experiments of the future FAIR facility at Darmstadt/Germany. The experiment will explore the phase diagram of hadronic matter in the regime of highest baryon densities. Nuclear fireballs created in heavy ion collisions of 8-45 AGeV beam energy will be studied with numerous probes, among them open charm. Reconstructing those...Go to contribution page
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J. Matthew Durham (Los Alamos National Laboratory)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterTwo Forward Silicon Vertex Trackers (FVTX) have been installed at the PHENIX Experiment at RHIC, and extend the precision vertex capability of the PHENIX Silicon Vertex Trackers (VTX) to forward rapidity. The FVTX consists of two endcaps, with four silicon mini-strip planes each, covering the angles from ~10 to 35 degrees (1.2< |y|<2.2) that match the two existing PHENIX muon spectrometer...Go to contribution page
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Jan Kopfer (Universität Wuppertal)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe Compressed Baryonic Matter experiment, CBM, is being built at the Facility for Antiproton and Ion Research, FAIR, at Darmstadt. The goal is to investigate the QCD phase diagram in particular in the region of high net baryonic density, using heavy ion collisions in a fixed target experiment at beam energies ranging from 8 to 45 GeV/nucleon. The high beam intensity and -quality of the SIS300...Go to contribution page
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Sourendu Gupta (Tata Institute of Fundamental Research)16/08/2012, 16:00Correlations and fluctuationsPosterWe report results from a new study of lattice QCD with decreased lattice spacing and using two flavours of light dyanamical quarks at finite temperature and chemical potential through the method of Taylor series expansions. With a factor of two in lattice spacings covered to date, the approach to the continuum limit is controlled better. In units of the inverse Compton wavelength of the light...Go to contribution page
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298. The Tungsten-Scintillating Fiber Accordion Electromagnetic Calorimeter for the sPHENIX DetectorDr Craig Woody (Brookhaven National Lab)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe PHENIX Experiment is planning a major upgrade to enhance its capabilities to measure jets in heavy ion collisions, as well as in p+A, polarized proton, and eventually e-A collisions at the Electron Ion Collider. One of the major new components of this upgrade will be a new compact electromagnetic calorimeter covering ±1 units in pseudorapidity and 2 in phi. It will consist of a matrix of...Go to contribution page
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Dr Song Shu (Faculty of Physics and Electronic Technology, Hubei University, China)16/08/2012, 16:00Exploring the QCD phase diagramPosterWe have discussed the tunnelling effect in FL model. The tunnelling coefficient is derived in the field configuration space by calculating the transition amplitude using the path integral at SPA and the dilute instanton gas approximation. By studying the tunnelling effect between the two degenerating vacuums at the critical temperature and chemical potential, we find that the system...Go to contribution page
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Bikash Sinha16/08/2012, 16:00New theoretical developmentsPosterALICE, ATLAS and CMS detectors at LHC and previously PHENIX and STAR detectors at RHIC have provided compelling evidence for higher order flow components apart from the elliptic flow v2. It is by now well established that both RHIC and LHC have produced a ”perfect fluid” of Quark Gluon Plasma with eta/s close to zero, as predicted by AdS/CFT limit. One expects that higher order harmonics...Go to contribution page
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Gergely Barnafoldi (Hungarian Academy of Sciences (HU))16/08/2012, 16:00JetsPosterAsymmetric high-energy proton-nucleus collision can give unique test of the high-energy nuclear effects. This case nuclear modification and rapidity asymmetry can be describe in parallel [1]. Moreover, measurements might enable us to separate or at least understand better the the mechanisms of the final and initial state nuclear effects in nucleus-nucleus collisions. Predictions for nuclear...Go to contribution page
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Giorgio Torrieri (JW Goethe Universitat, Frankfurt)16/08/2012, 16:00JetsPosterWe generalize the percolating transition discovered in [1] to the full phase diagram, exploring the onset of "quarkyonic percolation" for SU(N) Yang-Mills matter when baryon density, temperature and number of colors are varied. We show that percolation's dependence on number of colors is different from deconfinement, suggesting that the two phases are generally distinct, with the percolating...Go to contribution page
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Prof. Angel Gomez Nicola (Universidad Complutense Madrid)16/08/2012, 16:00QCD at finite temperature and densityPosterI will review recent and ongoing work on thermal meson properties relevant for the hadron gas regime in Relativistic Heavy Ion Collisions. These include transport coefficients, chemical nonequilibrium, susceptibilities, isospin breaking and different aspects on chiral symmetry restoration and the QCD transition. The basic framework is the use of Chiral Effective Lagrangians which ensure the...Go to contribution page
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Chun Shen (Ohio State University)16/08/2012, 16:00Electroweak probesPosterPhotons are believed to be clean and penetrating probes of the medium created in ultra-relativistic heavy-ion collisions. The thermal photon spectra and their anisotropy are known to be very sensitive to the thermalization time, the specific shear viscosity, the equation of state of produced matter, and the initial state fluctuations [1]. Previous computations of photon emission spectra have...Go to contribution page
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Dr Gabor David (Brookhaven National Laboratory)16/08/2012, 16:00Electroweak probesPosterWhile experimentally very demanding, thermal (low pT) photons and dileptons offer unique, direct access to the medium formed in heavy ion collisions, its size, temperature, lifetime, viscosity and other properties. Higher pT jet-medium photons can serve as a control (complementary) probe. On the other hand these measurements are very involved and the interpretation of the results is...Go to contribution page
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Dr Bhaswar Chatterjee (Physical Research Laboratory, Ahmedabad, India)16/08/2012, 16:00Electroweak probesPosterWe calculate explicitly the thermal quark propagator in presence of magnetic field that is relevant for heavy ion collision experiments at RHIC and LHC. Using this propagator, we calculate the momentum dependent polarization tensor and discuss the relevant collective excitations. Using the same, we also evaluate the thermal photon rate of quark matter in presence of magnetic field. We estimate...Go to contribution page
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Richard Petti (S)16/08/2012, 16:00Electroweak probesPosterThe hot and dense fireball produced in high energy heavy ion collisions, such as that at RHIC, exhibits complicated dynamics and time evolution. Thermal photons have a negligible cross-section with the medium and so pass through unmodified, thus measuring their properties gives access to the entire time evolution of the fireball. Thermal photons are expected to be observable at low momentum....Go to contribution page
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Takahiro Sasaki (K)16/08/2012, 16:00Exploring the QCD phase diagramPosterWe investigate theta-vacuum effects on the QCD phase diagram for the realistic 2+1 flavor system, using the three-flavor Polyakov-extended Nambu-Jona-Lasinio (PNJL) model and the entanglement PNJL model as an extension of the PNJL model. The theta-vacuum effects make the chiral transition sharper. For large theta-vacuum angle the chiral transition becomes first order even if the quark number...Go to contribution page
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Jason Glyndwr Ulery (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00Correlations and fluctuationsPosterTri-hadron azimuthal correlations are studied in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV in ALICE. They are analyzed with one intermediate $p_T$ trigger to preferentially select on jets and two lower $p_T$ associated particles. With these correlations interaction of the jets and the medium can be studied. Three-particle correlations can give insight into the sources of modification to the...Go to contribution page
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Mate Csanad16/08/2012, 16:00Exploring the QCD phase diagramPosterThe time evolution of the strongly interacting quark gluon plasma (sQGP) created in relativistic heavy ion collisions can be described by hydrodynamical models. Hadrons are created at the freeze-out of this fluid, thus their distributions reveal information about the final state. To access the time evolution and the initial state, one needs either additional information about the Equation of...Go to contribution page
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Bin Zhang (Arkansas State University)16/08/2012, 16:00Pre-equilibrium and initial state dynamicsPosterThe Quark-Gluon Plasma can be produced in high energy heavy ion collisions and how it equilibrates is important for the extraction of the properties of strongly interacting matter. A radiative transport model can be used to reveal interesting characteristics of Quark-Gluon Plasma thermalization. For example, screened parton interactions always lead to partial pressure isotropization. Systems...Go to contribution page
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Jorge Noronha (U)16/08/2012, 16:00New theoretical developmentsPosterWe argue, using the AdS/CFT correspondence, that the transient dynamics of the shear stress tensor in a strongly coupled N = 4 SYM plasma is not described by relaxation-type, fluid dynamical equations: at long times the equations of motion should contain a second-order comoving derivative of the shear stress tensor. This occurs because in this strongly-coupled system the lowest...Go to contribution page
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Ioannis Bouras (University of Frankfurt a.M.)16/08/2012, 16:00Global and collective dynamicsPosterUsing 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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Anton Wiranata (L)16/08/2012, 16:00Hadron thermodynamics and chemistryPosterIn this work, we present how shear viscosity and entropy density behave in the Hadronic system as the number of Resonances produced are increasing. Shear viscosity is calculated by so called Chapman-Enskog approximation and cross-sections used in this calculation are taken from experiments and UrQMD model. One interesting results is we are able to approach the famous 1/4\pi limit for the ratio...Go to contribution page
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Claude Andre Pruneau (Department of Physics and Astronomy)16/08/2012, 16:00Correlations and fluctuationsPosterWe report on the first study of transverse momentum differential correlation, $\la \Delta p_t \Delta p_t \ra$, in Pb - Pb collisions at \snn~= 2.76~TeV measured with the ALICE detector at the CERN Large Hadron Collider. We measure the two-particle correlation functions for $++$, $--$, and $+-$ charged particle pairs as a function of the pair azimuthal, $\Delta\phi$, and pseudorapidity,...Go to contribution page
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Marton Vargyas (ELTE)16/08/2012, 16:00Electroweak probesPosterPHENIX has measured the e^{+}e^{-} pair continuum in sqrt(s_{NN})=200 GeV Au+Au and p+p collisions over a wide range of mass and transverse momenta. The e^{+}e^{-} yield is compared to the expectations from hadronic sources, based on PHENIX measurements. We investigate the effects of radial flow on the transverse mass dependence of the dilepton spectrum in min. bias Au+Au collisions in the low...Go to contribution page
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Piotr Bozek16/08/2012, 16:00Global and collective dynamicsPosterResults of event-by-event simulations of a 3+1D viscous hydrodynamic model for Au-Au collisions at 200 GeV are presented. The fluctuations of the average transverse momentum in an event are determined by the fluctuations of the initial transverse size of the fireball. The mechanism involving transverse-momentum fluctuations from the initial size fluctuations, transmitted to the final...Go to contribution page
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Laszlo Pal Csernai16/08/2012, 16:00Global and collective dynamicsPosterFlow asymmetries are in focus of present heavy ion studies. In head-on collisions there would be no reason to have an azimuthal or longitudinal asymmetry, nevertheless, new observations for the higher harmonics show [1] that even in central collisions there is a strong azimuthal asymmetry in the emitted hadrons, and this asymmetry arises from transverse fluctuations of the initial state. This...Go to contribution page
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Theodore Koblesky Theo (University of Colorado)16/08/2012, 16:00Correlations and fluctuationsPosterTwo particle correlations in azimuth and pseudorapidity encapsulate a wealth of information from jet correlations from medium response to bulk collective flow. The PHENIX Silicon Vertex Detector (VTX) is a cylindrical, 4-layer detector close to the beampipe which extends the PHENIX tracking capability to a pseudorapidity from -1 to +1 and over nearly the full azimuth. The first heavy ion data...Go to contribution page
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Mr Jingbo Wang (Department of Engineering Physics, Tsinghua University, Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Beijing 100084, China)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterThe Compressed Baryonic Matter experiment at the future Facility for Antiproton and Ion Research will use a time-of-flight (TOF) wall for hadron identification, based on the MRPC technology. The challenge is to keep high efficiencies (above 90%) and good time resolutions (less than 80ps) at particle fluxes up to 20kHz/cm2, which is not accessible to conventional float-glass MRPCs. For this...Go to contribution page
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Jai Salzwedel (Ohio State University (US))16/08/2012, 16:00Correlations and fluctuationsPosterIn heavy-ion collisions produced at the LHC a significant number of baryons is emitted in each collision. Two-particle correlations of those baryons carry important information about the emitting source and the interaction between them. At low relative momentum femtoscopic correlations arise, which are sensitive to the homogeneity lengths of the system. Hydrodynamic models predict that...Go to contribution page
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Elizabeth Oldag (UT Austin, STAR Collaboration)16/08/2012, 16:00JetsPosterCorrelations on transverse momentum $p_t$ include important aspects of the six dimensional correlation space ($p_t1,\eta_1,\phi_1,p_t2,\eta_2,\phi_2$) [1]. Two-particle 2D correlations, $(p_t1,p_t2)$, for minimum-bias Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR show a broad peak extending from 0.5-4.0 GeV/c [2]. These correlations are formed from all charged particles with $p_t...Go to contribution page
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Andrew Marshall Adare (Yale University (US))16/08/2012, 16:00JetsPosterObservables involving fully reconstructed jets provide access to key properties of the quark-gluon plasma via partonic energy loss. In order to obtain the inclusive transverse momentum distribution of fully reconstructed jets using the ALICE tracking detectors and electromagnetic calorimeter, the smearing effect of non-ideal detector responses must be understood and corrected. The procedure...Go to contribution page
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Prof. Seto Richard (University of California, Riverside)16/08/2012, 16:00Experiment upgrades, new facilities, and instrumentationPosterStudies of proton (deuteron) - nucleus collisions allow for the detailed examination of cold nuclear matter effects (including gluon saturation, initial state parton energy loss, nuclear break up and others), while also providing a crucial baseline for nucleus-nucleus collisions with additional hot quark-gluon plasma effects. The PHENIX experiment is planning an ambitious upgrade...Go to contribution page
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Georg Wolschin (Heidelberg University)16/08/2012, 16:00Heavy flavor and quarkonium productionPosterWe suggest that the combined effect of screening, gluon-induced dissociation, Landau damping, and reduced feed-down explains most of the suppression of Y states that has been observed by CMS [1] in PbPb relative to pp collisions at sqrt(s_NN) = 2.76 TeV at the CERN LHC. The suppression is thus a clear, albeit indirect, indication for the presence of a qgp. In particular, we calculate the...Go to contribution page
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Ms P S Saumia (Institute of Physics)16/08/2012, 16:00Global and collective dynamicsPosterWe study the interesting similarities between the physics of cosmic microwave background radiation anisotropies and the flow anisotropies in relativistic heavy ion collision experiments. Further we explore how the techniques in CMBR analysis could be utilized in studying the flow anisotropies in RHICE. We argue that the initial state fluctuations of the matter formed in heavy ion...Go to contribution page
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Mr Manuel Lorenz (Goethe University Frankfurt)16/08/2012, 16:00Electroweak probesPosterThe HADES experiment, installed at the Helmholtzzentrum für Schwerionenforschung (GSI) accelerator facility in Darmstadt, investigates dielectron emission and strangeness production in various collision systems (p+p, p+n, p+A and A+A) in the 1-3.5 AGeV regime. The observed low-mass dielectron and Ξ- enhancement in intermediate heavy-ion collisions indicates the onset of medium effects, on...Go to contribution page
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Mr Zachary Wolff (Purdue University)16/08/2012, 16:00Global and collective dynamicsPosterComparing hydrodynamic simulations to data inevitably requires the conversion of the fluid to particles. This conversion is ambiguous for viscous fluids as an infinite class of phase space densities can produce the same hydrodynamic variables. We compute self-consistent phase space corrections for hadron species by solving the linearized Boltzmann equation. These distribution functions are...Go to contribution page
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Jacquelyn Noronha-Hostler (U)16/08/2012, 16:00Global and collective dynamicsPostervSPheRIO is a new second order viscous hydrodynamic code for ultrarelativistic heavy ion collisions that can be consistently run on an event-by-event basis. This code, which is the viscous generalization of the well known SPheRIO code \cite{Aguiar:2000hw}, solves second order viscous hydrodynamic equations. In this talk, we use vSPheRIO to investigate the time evolution of a boost invariant...Go to contribution page
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Michael Tannenbaum (Brookhaven National Laboratory (US))16/08/2012, 16:00Global and collective dynamicsPoster\bc {\large \bf{ Why the formula\\ $\mean{dN_{\rm ch}^{AA}/d\eta}=\mean{dN_{\rm ch}^{pp}/d\eta} [x N_{\rm part}/2 +(1-x) N_{\rm coll}]$\\ should be deprecated}} \bs Abstract for Quark Matter 2012 poster \bs \underline{Michael J. Tannenbaum}~$^{a)}$ $^{a)}$ Physics Department, Brookhaven National Laboratory, Upton, NY 11973-5000, USA The fact that the multiplicity density in A+A...Go to contribution page
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Boris Tomasik (Univerzita Mateja Bela (SK))16/08/2012, 16:00Hadron thermodynamics and chemistryPosterWe calculate the expectation of Xi yields in nuclear collisions at SIS energies for the case that the produces strangeness is distributed statistically over S<0 species. By taking into account that cascades are produced only in events where two kaons are produced we obtain theoretical value which is about 1/2 of that reported in previous calculations. Even possible modifications of hadron...Go to contribution page