-
Prof. Misha Stephanov (UIC)12/08/2012, 09:00Oral Presentation
-
Javier Lopez Albacete (IPhT-CEA)12/08/2012, 10:30Oral Presentation
-
Paul Sorensen (BNL)12/08/2012, 11:30Oral Presentation
-
Hannah Petersen12/08/2012, 13:00Oral Presentation
-
Dr Bjoern Schenke (Brookhaven National Lab)12/08/2012, 13:30Oral Presentation
-
Mike Lisa (Ohio State University (US))12/08/2012, 13:40Oral Presentation
-
Yen-Jie Lee (CERN)12/08/2012, 14:30Oral Presentation
-
Paul Chesler (MIT)12/08/2012, 14:35Oral Presentation
-
Bill Zajc (Columbia University)12/08/2012, 15:30Oral Presentation
-
Nestor Armesto Perez (Universidade de Santiago de Compostela (ES))12/08/2012, 17:15Oral Presentation
-
13/08/2012, 08:30
-
Bart Gordon13/08/2012, 09:00
-
Urs Wiedemann (CERN)13/08/2012, 09:30Oral Presentation
-
Takao Sakaguchi (BNL)13/08/2012, 10:45Oral Presentation
-
Xin Dong (LBNL)13/08/2012, 11:10Oral Presentation
-
Karel Safarik (CERN)13/08/2012, 11:35Oral Presentation
-
Barbara Krystyna Wosiek (Polish Academy of Sciences (PL))13/08/2012, 12:00Oral Presentation
-
Gunther Roland (Massachusetts Inst. of Technology (US))13/08/2012, 12:25Oral Presentation
-
Adrian Dumitru (Baruch College (City University of New York))13/08/2012, 14:15
-
Kevin Dusling13/08/2012, 14:40
-
Matthew Wysocki (University of Colorado at Boulder)13/08/2012, 15:05
-
Dr Jean-Yves Ollitrault (CNRS)13/08/2012, 15:30
-
Daniel Cebra (UC Davis)13/08/2012, 15:55
-
Sergey Voloshin (Wayne State University (US))13/08/2012, 16:50
-
Stephen James Sanders (University of Kansas (US))13/08/2012, 17:15This talk will present an overview of collective flow phenomena and dihadron correlations from the CMS experiment at the LHC in pp and PbPb collisions. Fourier components of the anisotropic azimuthal distribution, ranging from the second to the sixth component, are obtained using different analysis techniques, which have different sensitivities to non-flow and flow fluctuation effects....Go to contribution page
-
Adam Trzupek (Polish Academy of Sciences (PL))13/08/2012, 17:40
-
Huichao Song13/08/2012, 18:05
-
Guilherme Teixeira De Almeida Milhano (Instituto Superior Tecnico (PT))14/08/2012, 08:30Oral Presentation
-
Martin Spousta (Columbia University and Charles University)14/08/2012, 08:50Oral Presentation
-
Dr Andreas Morsch (CERN)14/08/2012, 09:10Oral Presentation
-
Dr Gabor Veres (CERN)14/08/2012, 09:30Oral Presentation
-
Michael McCumber (University of Colorado)14/08/2012, 09:50Oral Presentation
-
Marian Ivanov (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))14/08/2012, 10:10Oral Presentation
-
14/08/2012, 10:30
-
Wei Xie (Purdue University (US))14/08/2012, 11:15Oral Presentation
-
Prof. Marzia Rosati (Iowa State University)14/08/2012, 11:35Oral Presentation
-
Zaida Conesa Del Valle (CERN)14/08/2012, 11:55Oral Presentation
-
William Horowitz (University of Cape Town)14/08/2012, 12:15Oral Presentation
-
14/08/2012, 12:35
-
Takafumi for the PHENIX Collaboration Niida (University of Tsukuba)14/08/2012, 14:15Oral PresentationThe HBT measurement provides the information on the space-time evolution of particle emitting source in relativistic heavy ion collisions. Azimuthal component of 3D HBT radii relative to event plane gives us the information of the source shape at freeze-out. It also provides the information of the system evolution by comparing with the initial source shape. The recent measurement of higher...Go to contribution page
-
Dong Ho Moon (Korea University (KR))14/08/2012, 14:15Heavy flavor and quarkonium productionOral PresentationCMS has measured the nuclear modification factors of prompt J/psi in PbPb collisions at sqrt(sNN) = 2.76 TeV. For prompt J/psi with relatively high pT (6.5 < pT < 30 GeV/c), a strong, centrality-dependent suppression is observed in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. During the 2011 data taking period the data...Go to contribution page
-
Edward Shuryak (stony brook university)14/08/2012, 14:15Oral PresentationLarge energy deposition from LHC quenching jets restarted interest to shock formation. Shocks also have theoretical significance as the simplest out-of-equilibrium setting without time dependence. While weak shocks have small gradients and can be treated hydrodynamically in the Navier-Stokes (NS) approximation, the ones without a small parameter (strong shocks) needs other methods. Two...Go to contribution page
-
Yue Shi Lai (Massachusetts Inst. of Technology (US))14/08/2012, 14:15The first measurement of the transverse momentum (pT) imbalance of isolated-photon+jet pairs in relativistic heavy ion collisions is reported. The analysis uses data from PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair and corresponding to an integrated luminosity of 150/ub recorded by the CMS experiment at the LHC in 2011. For events containing an isolated photon with...Go to contribution page
-
Neha Shah (UCLA), neha shah (University of California Los Angeles)14/08/2012, 14:35Oral PresentationMeasurement of correlations of pair of particles with small relative momenta provides insight into geometry and lifetime of particle emitting source in relativistic heavy ion collisions. Kaon femtoscopy extends the range of pair transverse mass covered and provides a sample less affected by decay resonances as compared to pions. The correlation functions of non-identical particles in the...Go to contribution page
-
Roberta Arnaldi (Universita e INFN (IT))14/08/2012, 14:35Oral PresentationALICE is the LHC experiment dedicated to the study of heavy ion collisions. The main purpose of ALICE is to investigate the properties of a new state of deconfined nuclear matter, the Quark Gluon Plasma. Quarkonium measurements will play a crucial role in this investigation. In particular, the sequential suppression of the quarkonium states by color screening has long being suggested as a...Go to contribution page
-
YI GU (D)14/08/2012, 14:35Oral PresentationCollective flow measurements continue to play an important role in ongoing efforts to map out the temperature dependence of the transport coefficient $\frac{\eta}{s}(T)$, for the strongly interacting matter produced in heavy ion collisions at RHIC. Recently, PHENIX has performed a detailed set of measurements of the higher-order flow coefficients ($v_{n}$ for n=2,3,4), for both inclusive and...Go to contribution page
-
Zvi Citron (Weizmann Institute of Science (IL))14/08/2012, 14:35Oral PresentationThe correlations of jets with neutral bosons is a particularly powerful tool to probe the underlying physics of jet quenching. To gain insight into the physics of this process we can study Z-jet and gamma-jet correlations. Because the Z and photons do not directly couple to the strong force, in a jet+boson event the unmodified bosons allow us to access the modification of the opposite side...Go to contribution page
-
Yadav Pandit (Kent State University)14/08/2012, 14:55Global and collective dynamicsOral PresentationA primary goal of the RHIC Beam Energy Scan (BES) is to search for evidence of a transition between a hadron gas and a Quark Gluon Plasma. The dependence of $v_{1}$ and higher flow harmonics on system size and beam energy may be sensitive to the degrees of freedom in the system, as a consequence of early pressure gradients and a potential softening in the equation of state. In this talk,...Go to contribution page
-
Peter Petreczky (BNL)14/08/2012, 14:55Oral PresentationWe calculate different types of Wilson loops of temporal size t < 1/T at non-zero temperatures on the lattice using Highly Improved Staggered Quark (HISQ) action and temporal extent Nt=8 and 12. Unlike other static correlators which go around the periodic boundary these Wilson loops are not related to the free energy of static quark anti-quark pair. Therefore from the analysis of...Go to contribution page
-
Maciej Pawel Szymanski (Warsaw University of Technology (PL))14/08/2012, 14:55Oral PresentationIn heavy-ion collisions produced at the LHC two-particle correlations of mesons and baryons carry important information about the emitting source. At low relative momentum femtoscopic correlations arise, which are sensitive to the homogeneity lengths of the system. Hydrodynamic models predict that these will decrease with increasing transverse mass of the pair. Such decrease is...Go to contribution page
-
Justin Edward Frantz (Ohio University (US))14/08/2012, 14:55Oral PresentationA variety of heavy-ion data from RHIC and recently also from the LHC on hard direct photon production testifies that this "white" probe of the densely colored QGP continues to lend new insights to understanding jet suppression and energy loss. It also allows first comparisons between RHIC and LHC energies for the behavior of energy loss, for example whether jet fragmentation function is...Go to contribution page
-
Chun Shen (Ohio State University)14/08/2012, 15:15Global and collective dynamicsOral PresentationWe present a systematic study on the evolution of hadron spectra and their azimuthal anisotropy from the lowest collision energy studied at the Relativistic Heavy Ion Collider (RHIC), √s = 7.7A GeV, to the highest energy reachable at the Large Hadron Collider (LHC), √s = 5500A GeV [1]. As the collision energy increases, the resulting increases of the initial temperature, and fireball lifetime,...Go to contribution page
-
Nicolas Arbor (Centre National de la Recherche Scientifique (FR))14/08/2012, 15:15Oral PresentationGamma-hadron correlations measured in heavy-ion collisions produced at the LHC allow to investigate medium induced jet modifications in a transverse momentum (p_t) range below 50 GeV/c, where jet reconstruction is challenging because of the relatively large contribution from the underlying event. At high p_t direct photons, produced in Compton and annihilation QCD leading order processes, are...Go to contribution page
-
Darren McGlinchey (F)14/08/2012, 15:15Oral PresentationThe idea of using heavy quarkonia production as a direct probe of the screening length in the quark gluon plasma (QGP) has been around for over two decades. Suppression of quarkonia production in heavy ion collisions has been measured at the SPS, RHIC, and the LHC, including new measurements of $\Upsilon(1S+2S+3S)$ production in Au+Au collisions by PHENIX. However, a full understanding of...Go to contribution page
-
Rylan Towne Conway (University of California Davis (US))14/08/2012, 15:15Correlations and fluctuationsOral PresentationNew precision measurements of dihadron correlations triggered by a very high-pT particle in 2.76 TeV PbPb collisions over a broad range of pseudorapidity and the full range of azimuthal angle will be presented. Utilizing a novel and unique high-pT single-track high-level trigger, the analysis explores the full 2011 PbPb data set corresponding to an integrated luminosity of 150/ub collected by...Go to contribution page
-
Dr Ivan Vitev (LANL)14/08/2012, 15:35Tagged jet measurements provide a promising experimental channel to quantify the similarities and differences in the mechanisms of jet production in proton-proton and nucleus-nucleus collisions. We present the first calculation of the transverse momentum asymmetry of $Z^0/\gamma^*$-tagged jet events in $\sqrt{s}=2.76$~TeV reactions at the LHC. Our results combine the ${\cal O}(G_F\alpha_s^2)$...Go to contribution page
-
Alexandru Florin Dobrin (Wayne State University (US))14/08/2012, 15:35Correlations and fluctuationsOral PresentationStrong fluctuations of the anisotropic flow and the large acceptance of the ALICE detector allow an efficient selection of the events corresponding to a specific initial geometry. This opens many new possibilities to study the properties of the system created in ultra-relativistic nuclear collisions. In this talk, using the Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$~TeV data, we demonstrate...Go to contribution page
-
Mr Li Yan (Stony Brook University)14/08/2012, 15:35Oral PresentationThe particle spectrum from RHIC and LHC can be decomposed into harmonic series that defines the dipolar flow $v_1$, the elliptic flow $v_2$, the triangular flow $v_3$, and $v_4$, and $v_5$ etc. To understand the origin of higher order harmonics, we extend the linear response formalism for anisotropic flow to include the non-linear response which results from the interactions between the lowest...Go to contribution page
-
Barbara Trzeciak (Warsaw University of Technology)14/08/2012, 15:35Oral PresentationThe suppression of quarkonia production in high energy nuclear collisions relative to proton-proton collisions, due to the Debye screening of the quark-antiquark potential, was proposed as a signature of the formation of Quark-Gluon Plasma. However, there are other effects that may affect the observed quarkonia production, such as cold nuclear matter effects, final state nuclear absorption and...Go to contribution page
-
225. Azimuthal anisotropy of charged hadrons at very high pT in PbPb collisions at 2.76 TeV with CMSVictoria Zhukova (University of Kansas (US))14/08/2012, 15:55Measurements of the azimuthal anisotropy of charged hadrons are presented for PbPb collisions at 2.76 TeV over an extended transverse momentum range up to approximately 60 GeV/c. The data were collected with the CMS detector at the LHC. Utilizing a novel and unique high-pT single-track high-level trigger, the analysis explores the full 2011 PbPb data set corresponding to an integrated...Go to contribution page
-
Ralf Rapp (Texas A&M University)14/08/2012, 15:55Heavy flavor and quarkonium productionOral PresentationWe employ a kinetic rate-equation approach in a thermally expanding medium to compute the suppression and regeneration of quarkonia in heavy-ion collisions [1]. The in-medium properties of quarkonia figuring into the rate equation (widths, binding energies and heavy-quark masses) are constrained by euclidean correlators from lattice QCD. Input cross sections for heavy quarks and quarkonia, as...Go to contribution page
-
Gabriel Denicol (Frankfurt University)14/08/2012, 15:55Global and collective dynamicsOral PresentationWe present a general derivation of relativistic fluid dynamics from the relativistic Boltzmann equation using the method of moments [1]. The main difference between our approach and the traditional 14-moment approximation is that we do not close the fluid-dynamical equations of motion by truncating the expansion of the single-particle momentum distribution function. Instead, we keep all the...Go to contribution page
-
Guillermo Breto Rangel (University of California Davis (US))14/08/2012, 16:45Heavy flavor and quarkonium productionOral PresentationThe three Y states (1S, 2S, 3S) can be separated using the CMS experimental apparatus via their dimuon decays in both pp and heavy-ion collisions. A suppression of the Y(1S) and Y(2S) mesons is observed in PbPb collisions at sqrt(sNN) = 2.76 TeV, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. Furthermore, a suppression of the excited Y...Go to contribution page
-
Dominik Karol Derendarz (Polish Academy of Sciences (PL))14/08/2012, 16:45Oral PresentationAnisotropy coefficients v_n are important observables for studying the hot, dense medium created in heavy ion collisions. They not only probe the collective flow of the bulk medium (at pT<3-4 GeV), but also probe the path-length dependent energy loss (at higher pT), both are associated with the asymmetries in the initial geometry. However, auto-correlations not related to initial geometry,...Go to contribution page
-
Mr Prithwish Tribedy (for the STAR collaboration)14/08/2012, 16:45Correlations and fluctuationsOral PresentationDynamical fluctuations in globally conserved quantities such as baryon number, strangeness, charge, and isospin are suggested to carry information about the de-confinement and chiral phase transitions. An observation of enhanced dynamical fluctuations or non-monotonic behavior of transverse momentum correlations as a function of colliding energy might indicate the system has probed the...Go to contribution page
-
Matthew Nguyen (Ecole Polytechnique (FR))14/08/2012, 16:45This presentation describes jet measurements in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV performed with the CMS detector at the LHC. With data from the 2011 Run, dijet measurements have been extended to large transverse momentum, up to 350 GeV/c. The dijet momentum balance and angular correlations are studied in detail as a function of collision centrality and...Go to contribution page
-
Aaron Richard Angerami (Columbia University (US))14/08/2012, 17:05Oral PresentationThe energy loss of high-pt partons through the phenomenon of jet quenching provides insight into the transport properties of the medium created in relativistic heavy ion collisions. Evidence for this energy loss was first experimentally established through observation of high-pt hadron suppression at RHIC. This observable is not ideal for detailed quenching measurements as the final state...Go to contribution page
-
Heng-Tong Ding (Brookhaven National Lab)14/08/2012, 17:05Oral PresentationWe study the momentum dependence of charmonia in a hot medium using lattice QCD calculations. We analyze correlation functions and extract spectral functions from quenched calculations on large lattices close to the continuum limit in the temperature region $1.5<T/T_c<3$ as well as for $T\simeq 0.75T_c$. We examine the modifications of dissociation temperatures of the bound states when they...Go to contribution page
-
Matthew Luzum (IPhT Saclay)14/08/2012, 17:05Global and collective dynamicsOral PresentationWe report an extraction of the ratio of shear viscosity to entropy density (eta/s) of the medium created in relativistic heavy-ion collisions at the LHC. With a significant improvement of one of the main sources of theoretical uncertainty, we are able for the first time to quote a precise average value with robust error bars, systematically accounting for all known sources of systematic error...Go to contribution page
-
Michael Weber (University of Houston (US))14/08/2012, 17:05Correlations and fluctuationsOral PresentationThe creation of a strongly interacting deconfined Quark Gluon Plasma (QGP) phase in relativistic heavy-ion collisions can be studied by the fluctuations of conserved quantities like net-charge, and correlations between positive and negative pairs by using the method of Balance functions. Net-charge fluctuations are sensitive to the number of charges present in the system, thus the fluctuations...Go to contribution page
-
Marguerite Belt Tonjes (University of Maryland (US))14/08/2012, 17:25Measurements of charged hadron and inclusive jet transverse momentum (pT) spectra in pp and PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV with the CMS detector will be reported. These measurements make use of the high-statistics jet-triggered data recorded in 2011, including the total available PbPb luminosity of 150/ub. Charged particles are reconstructed using an...Go to contribution page
-
Ionut Cristian Arsene (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))14/08/2012, 17:25Oral PresentationThe hot and dense nuclear matter created in nuclear collisions at relativistic energies consists of a plasma of deconfined quarks and gluons. Due to their large mass, the charm quarks are mainly formed in the first instants of the nuclear collision and will consequently experience the full history of the system. It was predicted that the strongly bound J/Ã state will be suppressed in the hot...Go to contribution page
-
Maxime Rene Joseph Guilbaud (Universite Claude Bernard-Lyon I (FR))14/08/2012, 17:25Oral PresentationIn this talk we present a measurement of the pseudorapidity distribution in the range −5 < eta < 5.25, for different centralities in Pb-Pb collisions at sqrt(s_NN) =2.76 TeV. This also allows us to estimate the total number of produced charged particles. The measurement is performed exploiting LHC satellite bunches, that is bunches captured in non-nominal RF buckets. These give rise to...Go to contribution page
-
Ms Lizhu Chen (Central China Normal University)14/08/2012, 17:25Correlations and fluctuationsOral PresentationIn high-energy nuclear collisions, we study the properties of the excited nuclear matter with QCD degrees of freedom and search for the signals of the QCD phase transition. The ratios of the cumulants of conserved number distributions are sensitive to the correlation length of the system created in heavy-ion collisions, hence they are considered as good observables to study phase transitions....Go to contribution page
-
Kirill Tuchin (Iowa State University)14/08/2012, 17:45Oral PresentationWe discuss the gluon saturation/color glass condensate effects on J/Psi production in high energy pA and AA collisions. We report the results of numerical calculations of the corresponding nuclear modification factors. We found a good agreement between our calculations and the experimental data on J/Psi production in pA collisions. We also observe that cold nuclear modification effects alone...Go to contribution page
-
Yasuto Hori (University of Tokyo (JP))14/08/2012, 17:45Oral PresentationThe charge dependence of the azimuthal correlations between produced hadrons is an important probe of the QGP matter created in relativistic heavy-ion collisions. In this talk, we will present the mixed harmonic charge dependent azimuthal correlations measured at mid-rapidity in Pb-Pb collisions at \sqrt{s_{NN}} = 2.76 TeV by the ALICE Collaboration at the LHC. We observe a clear charge...Go to contribution page
-
Dr Magdalena Malek (University of Illinois at Chicago (US))14/08/2012, 17:45Global and collective dynamicsOral PresentationThe transverse energy flow in PbPb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy has been measured over a broad range of centrality for pseudorapidities between -5.2 and 5.2 using the CMS detector at the LHC. This analysis is based on 0.306/ub of data from 2010, with recently extended number (and range) of pseudorapidity and centrality bins. The transverse energy per unit of...Go to contribution page
-
Barbara Betz (Frankfurt University)14/08/2012, 17:45Recent LHC data on the nuclear modification factor of jet fragments suggest that the jet-medium coupling at the Large Hadron Collider (LHC) may be reduced relative to the coupling at the Relativistic Hadron Collider (RHIC). We estimate the magnitude of that reduction from a combined fit to the data on the nuclear modification factor and on the elliptic flow at both RHIC and LHC energies over...Go to contribution page
-
Piotr Bozek14/08/2012, 18:05Oral PresentationThe puzzle of the fall-off of the same-side ridge in relative pseudorapidity, found in unbiased two-particle correlations, is solved. We show that the event-by-event hydrodynamics followed by statistical hadronization with proper charge conservation provides the crucial non-flow component and leads to agreement with the data at soft transverse momenta (p_T < 2 GeV). The fall-off of the...Go to contribution page
-
Sangyong Jeon (McGill University)14/08/2012, 18:05Global and collective dynamicsOral PresentationHydrodynamic models enjoy much success in describing and predicting the bulk dynamics of relativistic heavy ion collisions. Recent studies have clearly shown that including initial and final fluctuations is essential for detailed study of the evolving QGP. So far, however, not many studies appeared which incorporate both fluctuations at the same time. Here we present our first results in...Go to contribution page
-
Dr Rishi Sharma (TRIUMF)14/08/2012, 18:05Heavy flavor and quarkonium productionOral PresentationWe calculate the yields of quarkonia in heavy ion collisions at RHIC and the LHC as a function of the transverse momentum. We focus on the consistent implementation of dynamically calculated nuclear matter effects, such as coherent power corrections, cold nuclear matter energy loss, and the Cronin effect in the initial state, and collisional dissociation of quarkonia in the final state as...Go to contribution page
-
Rosi Jan Reed (Yale University (US))14/08/2012, 18:05Oral PresentationMeasurements of high-pt particle production in heavy-ion collisions at RHIC have shown that medium-induced energy loss affects the partons produced in the early stage of a heavy-ion collision. The increased initial production cross section for partons at LHC energies makes fully reconstruted jets available in a wide kinematic range, which allows for a differential investigation of parton...Go to contribution page
-
Prof. Wolfgang Bauer (Distinguished University Professor, Michigan State University)14/08/2012, 19:00Oral Presentation
-
Thomas Schaefer (N)15/08/2012, 08:30Global and collective dynamicsOral PresentationWe study the effects of bulk viscosity on $p_T$ spectra and elliptic flow in heavy ion collisions. For this purpose we compute the dissipative correction $\delta f$ to the single particle distribution functions in leading-log QCD, and in kinetic models of a hadronic resonance gas. We find that for a near conformal fluid the bulk viscosity is suppressed by two powers of the conformal...Go to contribution page
-
Clemens Wohrmann (KIT - Karlsruhe Institute of Technology (DE))15/08/2012, 08:30Pre-equilibrium and initial state dynamicsOral PresentationThe energy flow at very high pseudorapidity in PbPb collisions is sensitive to the very low-x components of the nuclear wave-function. The CASTOR calorimeter extends the pseudorapidity coverage of CMS to -6.6, which is only 1.4 units away from the beam rapidity. A comparison of the centrality dependence of forward energy flow to that at lower pseudorapidities can shed light on the gluon...Go to contribution page
-
Gojko Vujanovic (McGill University)15/08/2012, 08:30The penetrating nature of dileptons makes them suitable probes to explore the properties of the strongly-interacting medium created in relativistic nuclear collisions. This study investigates thermal dilepton production using MUSIC (a Monotone Upstream-centered Scheme for Ion Collisions): a 3+1D hydrodynamic simulation with or without shear viscosity. We utilize dilepton emission rates that...Go to contribution page
-
Thorsten Renk (University of Jyväskylä)15/08/2012, 08:30Hard probes are a cornerstone in the ongoing program to determine the properties of hot and dense QCD matter as created in ultrarelativistic heavy ion collisions. The first two runs at the LHC have resulted in a wealth of measurements of both reconstructed jets and single inclusive high P_T hadrons, opening new kinematic windows and offering high statistics. Yet on first glance, several...Go to contribution page
-
Dr Ermias Atomssa (Stony Brook University)15/08/2012, 08:50Measurements of lepton pair spectra are a crucial tool to map out the evolution of the hot dense matter created in ultra-relativistic heavy ion collisions. At low pair mass, direct photons and low mass vector mesons are the main center of interest. Interpretation of lepton pair production rates in excess of expectations from hadronic decays observed by PHENIX and how the data constrains...Go to contribution page
-
Michael Strickland (Gettysburg College), Wojciech Florkowski (Institute of nuclear Physics, Krakow)15/08/2012, 08:50Oral PresentationRecently formulated model of highly-anisotropic and strongly dissipative hydrodynamics is used in 3+1 dimensions to study behavior of matter produced in ultra-relativistic heavy-ion collisions. We search for possible effects of the initial high anisotropy of pressure on the final soft-hadronic observables. We find that by appropriate adjustment of the initial energy density and/or the initial...Go to contribution page
-
Bjoern Schenke15/08/2012, 08:50Global and collective dynamicsOral PresentationWe present recent developments in describing anisotropic flow in heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National Laboratory and the Large Hadron Collider (LHC) at CERN with a relativistic 3+1 dimensional viscous event-by-event hydrodynamic simulation. We present results for elliptic, triangular and higher harmonic flow coefficients, including...Go to contribution page
-
Leticia Cunqueiro (Unknown-Unknown-Unknown)15/08/2012, 08:50Oral PresentationTo capture the full dynamics of the mechanisms of energy loss of hard partons in their passage through the dense medium created in Heavy Ion Collisions, jet reconstruction is required. In this analysis we explore the radiation pattern of jets in Pb–Pb collisions at sqrt(s_NN) = 2.76 TeV and compare it to that of baseline pp jets at the same collision energy. Di-jets are selected by requiring...Go to contribution page
-
Jamal Jalilian-Marian (Baruch College)15/08/2012, 09:10Oral PresentationDi-hadron azimuthal angular correlations in the forward rapidity region of deuteron-nucleus collisions at RHIC show a disappearance of the away side peak with centrality and transverse momentum. This can be understood, in the Color Glass Condensate (CGC) formalism, to be due to multi-gluon exchanges between the projectile and target. We show that CGC formalism predicts a similar disappearance...Go to contribution page
-
Dr Huang Bingchu (Brookhaven National Lab)15/08/2012, 09:10Di-leptons serve as clean and bulk penetrating probes to study the properties of the strongly interacting hot and dense medium created in heavy ion collisions. They are produced in all stages of the heavy-ion collisions and are not affected by strong interactions, hence can probe the entire evolution of the collision. Di-lepton production in the low mass range ($M_{ll}<1.1$ GeV/$c^{2}$)...Go to contribution page
-
Dr maki kurosawa (RBRC)15/08/2012, 09:10Oral PresentationCollective flow is one of the key measurements to study the hot and dense matter created in heavy ion collisions, because it relates closely to early evolution of the matter. In particular, higher harmonic flow measurements plays an important role in constraining theoretical model calculations describing properties of the matter. The silicon vertex tracker (VTX) was installed into the...Go to contribution page
-
Pelin Kurt (Vanderbilt University (US))15/08/2012, 09:10Jet shape measurements are important for many applications. When measured in pp collisions they can be used to constrain generator and showering settings. When measured in PbPb collisions they can be used to probe for distortions from energy loss in the hot and dense medium. Fully unfolded jet shape measurements will be presented and compared with generator expectations in 7 TeV pp collisions,...Go to contribution page
-
Baldo Sahlmueller15/08/2012, 09:30Oral PresentationWhile the study of the quark-gluon plasma has been the primary focus of the RHIC experiments, much work has also been done to understand so-called cold nuclear matter (CNM) effects through $d$+Au collisions where no hot plasma is produced. Effects such as nuclear shadowing, Cronin enhancement, and initial-state parton energy loss, among others, are not only interesting in their own right, but...Go to contribution page
-
Martin Rybar (Charles University (CZ))15/08/2012, 09:30Oral PresentationThe recent measurements of jet suppression at LHC indicate a presence of "jet quenching" -- strong energy loss of energetic jets in hot and dense QCD medium which has been already observed at RHIC experiments. We present a measurement of jet properties which sheds more light on the mechanism of jet energy loss. We will discuss the results of measurement of longitudinal, and transverse...Go to contribution page
-
Prof. Rainer Fries (Texas A&M University)15/08/2012, 09:30Oral PresentationWe investigate the correlations of photons produced by back scattering of fast partons in quark gluon plasma with their away‐side jets. Back scattering with photon emission, or jet‐photon conversion, was originally proposed as a novel source of photons in Phys. Rev. Lett. 90, 132301 (2003). The unique appeal of this photon source lies in the fact that its photons carry information about b...Go to contribution page
-
Li Yi (Purdue University)15/08/2012, 09:30Oral PresentationAzimuthal anisotropic flows vn, arising from the anisotropic collision geometry, reflect the hydrodynamic properties of the quark gluon plasma created in relativistic heavy-ion collisions. A long standing issue in vn measurements is the contamination of nonflow, caused by intrinsic particle correlations unrelated to the collision geometry. Nonflow limits, in part, the precise extraction of the...Go to contribution page
-
Frank Ma (Massachusetts Inst. of Technology (US))15/08/2012, 09:50The jet fragmentation function of inclusive jets with pT > 100 GeV/c in PbPb collisions is measured for reconstructed charged particles with pT > 1 GeV/c within the jet cone. A data sample of PbPb collisions collected in 2011 at a center of mass energy of √sNN =2.76 TeV corresponding to an integrated luminosity of Lint = 129 μb−1 is used. The results for PbPb collisions as a function of...Go to contribution page
-
Prof. Ben-Wei Zhang (Central China Normal University)15/08/2012, 09:50Parton energy loss in the hot QCD medium will manifest itself not only in leading hadron spectra but also in reconstructed jet productions in high-energy nucleus-nucleus collisions. With its more differential power full jets in heavy-ion collisions can then provide excellent tools to study the properties of the QGP and impose constraints on different parton energy loss models. With this...Go to contribution page
-
Martin Rudolf Wilde (Westfaelische Wilhelms-Universitaet Muenster (DE))15/08/2012, 09:50Oral PresentationDirect photons are an important probe in diagnosing the highly excited state of nuclear matter created in heavy-ion collisions: They allow access to various stages of the collision including the initial state. The ALICE detector is equipped with two high resolution electromagnetic calorimeters and a central tracking system that make it well suited to study direct photon production at low...Go to contribution page
-
Prof. Chiho Nonaka (Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) and Department of Physics, Nagoya University)15/08/2012, 09:50Global and collective dynamicsOral PresentationCurrently a possible origin of "Mach-Cone-like structure" is regarded as triangular flow and higher harmonics which are produced through event-by-event fluctuated initial states, which is a push to implement effects of event-by-event fluctuations in the initial conditions of relativistic hydrodynamic models. When the hydrodynamic simulation is performed with initial conditions with the...Go to contribution page
-
Paul Chesler (MIT)15/08/2012, 10:10Oral PresentationA remarkable result from heavy ion collisions at the Relativistic Heavy Ion Collider and Large Hadron Collider is that, shortly after the collision event, the quark-gluon plasma produced behaves as a nearly ideal liquid. Understanding the dynamics responsible for such rapid "hydroization" is a challenge using traditional perturbative field theory. In recent years holography has emerged as...Go to contribution page
-
Fabio Dominguez (IPhT Saclay)15/08/2012, 10:10The new studies of heavy ion collisions performed at the LHC have shown the necessity to improve our understanding of parton propagation and gluon emission in the presence of a hot QCD medium. In particular, the ability to measure jets in heavy ion collisions implies that, in order to fully understand jet quenching phenomena, we must go beyond leading parton energy loss and attempt to describe...Go to contribution page
-
Mr NASIM MD (Variable Energy Cyclotron Centre)15/08/2012, 10:10Global and collective dynamicsOral PresentationOne of the main goals of the STAR experiment at Relativistic Heavy Ion Collider (RHIC) is to study the properties of the QCD matter at extremely high energy and parton densities, created in the heavy-ion collisions. Understanding the partonic collectivity through the measurement of elliptic flow ($v_{2}$) of multi-strange hadrons ($\phi$, $\Xi$ and $\Omega$) is believed to be a sensitive...Go to contribution page
-
Dr shengli huang (PHENIX Collaboration)15/08/2012, 11:00Oral PresentationThe number of quark ($n_q$) scaling, which is manifested as $v^{hadron}_{2}(p_T) \approx n_q*v_2(p_T/n_q)$, is an approximate scaling that comes from the addition of the valence quark momenta at hadronization. The observation of $n_q$ scaling has been claimed that a partonic matter with quark-like degrees of freedom and significant collectivity has been generated in heavy ion...Go to contribution page
-
Jason Glyndwr Ulery (Johann-Wolfgang-Goethe Univ. (DE))15/08/2012, 11:00Oral PresentationPrevious experimental measurements from nuclear collisions have indicated modifications of jets by interaction with the medium created in the collision. Observables from particle correlations in the ALICE detector continue to provide access to key properties of the hot deconfined nuclear matter. New results from two- and three-particle number and transverse momentum correlations are presented....Go to contribution page
-
Iwona Grabowska-Bold (AGH Univesity of Science and Technology (PL))15/08/2012, 11:00Oral PresentationDirect photons are a powerful tool to study heavy ion collisions. Their production rates provide access to the initial state PDFs, which are expected to be modified by nuclear effects. They also provide a means to calibrate the expected energy of jets that are produced in the medium, and thus are a tool to probe the physics of jet quenching more precisely both through jet rates and...Go to contribution page
-
Tuomas Lappi (U)15/08/2012, 11:00Pre-equilibrium and initial state dynamicsOral PresentationMultiparticle correlations, such as the "ridge" effect in pp and AA collisions and forward dihadron correlations in pA collisions, are an important probe of the strong color fields that dominate the initial stages of a heavy ion collision. We argue that the Color Glass Condensate framework provides the most natural way to understand them. We describe recent progress in understanding...Go to contribution page
-
Long-Gang Pang (l)15/08/2012, 11:20Global and collective dynamicsOral PresentationHadron spectra and elliptic flow in high-energy heavy-ion collisions are studied within a (3+1)D ideal hydrodynamic model with fluctuating initial conditions given by the AMPT Monte Carlo model and compared to experimental data. Fluctuation in the initial energy density comes from not only the coherent soft interaction of overlapping nucleons but also the number of mini-jets within each binary...Go to contribution page
-
George Stephans (Massachusetts Inst. of Technology (US))15/08/2012, 11:20Final data on isolated photon production will be presented, measured in both pp and PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV with the CMS detector at the LHC. The isolated photon transverse energy (ET) spectra, covering the pseudorapidity range |eta| < 1.44 and transverse energy ET > 20 GeV, are found to be in good agreement with next-to-leading-order perturbative...Go to contribution page
-
Jiangyong Jia (Brookhaven National Laboratory (BNL)-Unknown-Unknown)15/08/2012, 11:20Oral PresentationA study of the dipole flow (v_1) associated with initial geometry fluctuations is presented using the 2010 Pb-Pb data. This analysis involves a systematic decomposition of the first order Fourier coefficient of the two-particle correlation into a dipole flow component and a global momentum conservation component. The dipolar flow is extracted as function of pT (0.5-10 GeV), centrality (0-50%)...Go to contribution page
-
Filip Krizek (Helsinki Institute of Physics (FI))15/08/2012, 11:20Oral PresentationA high-$p_{T}$ jet suppression first observed at RHIC has been reported also at the LHC. The ALICE collaboration has recently reported an observation of an enhanced intra-jet yield of charged particles associated with the high-\pt{} trigger particle ($I_{\rm AA}$) in central \pbpb\ collisions at \snn=2.76 \tev\ which may be also interpreted as a hint of the modification of the fragmentation...Go to contribution page
-
Karel Safarik (CERN)15/08/2012, 11:40Oral PresentationA baryon anomaly – an increase baryon-to-meson production ratio at intermediate transverse momenta in heavy-ion collisions when compared to proton–proton collisions – is observed at RHIC and the LHC. This effect is usually explained by recombination of constituent quarks during QGP hadronisation, or as a consequence of a strong radial flow developed during the heavy-ion collision. In this...Go to contribution page
-
Mr J. Scott Moreland (Duke University)15/08/2012, 11:40Pre-equilibrium and initial state dynamicsOral PresentationThe precise value of the QGP kinematic shear viscosity eta/s is a question of intense topical interest. Viscous hydrodynamic simulations are a tool for extracting this information from experiment. The key observables are the anisotropic flow coefficients v_n which (i) can be measured very precisely and (ii) are very sensitive to eta/s which controls the "conversion efficiency" v_n/ecc_n for...Go to contribution page
-
Alice Ohlson (Yale University)15/08/2012, 11:40The relationship between jet properties and the underlying geometry of the medium produced in heavy ion collisions can be explored through a measurement of the correlation between the axes of reconstructed jets and the reaction plane (defined as jet $v_2$). Such a measurement provides information on the pathlength dependence of medium-induced parton energy loss as well as biases in...Go to contribution page
-
Jiri Dolejsi (Charles University (CZ))15/08/2012, 11:40Oral PresentationCollisions of lead nuclei at the LHC allow study of the deconfined phase of QCD matter at unparalleled temperatures and energy densities. The use of leptonic observables is particularly appealing as a consequence of their electroweak nature, allowing them to traverse the strongly-coupled medium essentially unaffected. W and Z bosons, observed through their semi-leptonic decay channels, may...Go to contribution page
-
Michal Broz (Comenius University (SK))15/08/2012, 12:00Global and collective dynamicsOral PresentationThe ALICE Experiment features low material budget and high resolution tracking, which allow for precise measurements of charged particle production. The measurement of the antibaryon to baryon ratios ($\bar{B}$/B), in particular, probes the baryon transport and the degree of baryon stopping in high energy collisions, providing insight into the collision dynamics and the structure of baryons....Go to contribution page
-
Dmitri Peresunko (National Research Centre Kurchatov Institute (RU))15/08/2012, 12:00Oral PresentationIdentified hadron spectra are considered to be sensitive to transport properties of strongly interacting matter produced in high-energy nucleus-nucleus collisions. We present measurements of $\pi^0$ and $\eta$ mesons at mid-rapidity in a wide transverse momentum range in pp and Pb-Pb collisions at LHC energies measured with the ALICE detector. The mesons are reconstructed via their...Go to contribution page
-
Raju Venugopalan (Brookhaven National Laboratory)15/08/2012, 12:00Pre-equilibrium and initial state dynamicsOral PresentationWe outline significant recent progress in a program to include quantum corrections to the evolution of the classical color fields produced in high-energy ultra-relativistic heavy ion collisions. Previous work in this direction for a scalar \phi^4 theory [1] has now been extended to QCD. Leading contributions from unstable quantum modes can be resumed to all loop orders and expressed in terms...Go to contribution page
-
Lamia Benhabib (Ecole Polytechnique (FR))15/08/2012, 12:00The Compact Muon Solenoid (CMS) is fully equipped to measure leptonic decays of electroweak probes in the high multiplicity environment of nucleus-nucleus collisions. Electroweak boson production is an important benchmark process at hadron colliders. Precise measurements of W and Z production in heavy-ion collisions can help to constrain nuclear PDFs as well as serve as a standard candle of...Go to contribution page
-
Xuan Li (Shandong University)15/08/2012, 12:20Pre-equilibrium and initial state dynamicsOral PresentationThe proton gluon distribution function increases rapidly with decreasing x at fixed $Q^{2}$, but cannot increase indefinitely as x goes to 0. Gluon saturation is expected at a low x value when gluon recombination balances gluon splitting. The nuclear (with atomic mass number A) gluon distribution is approximately $A^{1/3}$ larger than the nucleon gluon distribution function at the same x [1]....Go to contribution page
-
Gian Michele Innocenti (Universita e INFN (IT))15/08/2012, 12:20Oral PresentationThe measurement of heavy-flavour production provides insights on the properties of the high-density QCD medium created in heavy-ion collisions. In particular, the comparison of charm production in pp and in Pb-Pb collisions allows to study the mechanism of in-medium energy loss of heavy quarks. Furthermore, since strange quarks are abundant in the medium, the relative yield of D+s mesons with...Go to contribution page
-
Frank Geurts (Rice University (US))16/08/2012, 08:30Oral Presentation
-
Itzhak Tserruya (Weizmann Institute of Science (IL))16/08/2012, 08:55Oral Presentation
-
Peter Alan Steinberg (Brookhaven National Laboratory (US))16/08/2012, 09:20Oral Presentation
-
Raphael Granier De Cassagnac (Ecole Polytechnique (FR))16/08/2012, 09:45Oral Presentation
-
Camelia Mironov (Ecole Polytechnique (FR))16/08/2012, 11:05Oral Presentation
-
Enrico Scomparin (Universita e INFN (IT))16/08/2012, 11:25Oral Presentation
-
Tetsuo Hatsuda (Unknown)16/08/2012, 11:45Oral Presentation
-
16/08/2012, 12:05
-
Gang Wang (UCLA)16/08/2012, 12:20Oral Presentation
-
Dr Abhijit Majumder (Wayne State University)16/08/2012, 14:00Oral PresentationThe in-medium modification of a hard jet is reformulated to consider the process of a hard parton propagating through a finite sized QCD medium, held at a fixed high temperature and vanishing chemical potential. The process is factorized into a hard part representing the propagation and scattering of the parton, and a soft part representing the non-perturbative color field experienced by the...Go to contribution page
-
Leonardo Milano (Universita e INFN (IT))16/08/2012, 14:00Hadron thermodynamics and chemistryOral PresentationIdentified particle spectra are a basic observable to understand the behaviour of the matter created in high-energy heavy-ion collisions. The transverse momentum distributions of identified hadrons contain informations about the transverse expansion of the system and constrain the freeze-out properties of the matter created. The ALICE experiment has very good particle identification...Go to contribution page
-
Derek Teaney (Stony Brook University)16/08/2012, 14:00Oral PresentationWe determine the photon production rate at next to leading order, i.e. through order $g^2 m_D/T$. At leading order, photon production is determined by three processes: hard two-to-two collisions, collinear bremsstrahlung, and quark-conversions, i.e. a process where the incoming quark transfers almost all of its momentum to the produced photon and the final state quark is soft. At NLO, wider...Go to contribution page
-
Christopher Coleman-Smith (Duke Physics)16/08/2012, 14:00Recent results from Pb+Pb collisions at the LHC have shown evidence of dramatic medium modification of di-jets. Although asymmetric di-jets are also seen in p+p collisions, di-jets with a large energy asymmetry are found much more often in Pb+Pb collisions. E.g., events with a 200 GeV leading jet and a 80 GeV subleading jet were frequently observed. The increase in the average energy asymmetry...Go to contribution page
-
Paul Romatschke (FIAS Frankfurt)16/08/2012, 14:20Oral PresentationHydrodynamics predicts long-lived sound and shear waves. Thermal fluctuations in these waves can lead to the diffusion of momentum density, contributing to the shear viscosity and other transport coefficients. Within viscous hydrodynamics in 3+1 dimensions, this leads to a positive contribution to the shear viscosity, which is finite but inversely proportional to the microscopic shear...Go to contribution page
-
Antonio Ortiz Velasquez (Lund University (SE))16/08/2012, 14:20Oral PresentationThe main tracking detector in the central barrel ($|\eta|<1$) of the ALICE experiment is the Time Projection Chamber. In addition to charged particle tracking it provides particle identification (PID) through the measurement of the specific energy loss, $dE/dx$. At low momentum ($p < 1$ GeV/c), pions, kaons, and protons can be cleanly separated. Thanks to the relativistic rise of the $dE/dx$,...Go to contribution page
-
Peter Braun-Munzinger (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))16/08/2012, 14:20Hadron thermodynamics and chemistryOral PresentationWe investigate, using the newest LHC data, the energy dependence of hadron production within the framework of the statistical hadronization model. The data are confronted with predictions based on extrapolation from lower (RHIC) energies. While the yields of hadrons made from light (u,d,s) quarks generally exhibit little change apart from the overall increase in multiplicity, a...Go to contribution page
-
Mindaugas Lekaveckas (MIT)16/08/2012, 14:20Oral PresentationWe calculate P(k_perp), the probability distribution for an energetic parton propagating for a distance L through a medium to pick up transverse momentum k_perp, for a medium consisting of weakly coupled quark-gluon plasma. We use full or HTL self-energies in appropriate regimes, resumming each in order to find the leading large-L behavior. We estimate the jet quenching parameter and compare...Go to contribution page
-
Petr Balek (Charles University (CZ))16/08/2012, 14:40Oral PresentationThe measurement of charged particle spectra in heavy ion collisions is a direct way to study properties of hot and dense matter created in these interactions. The centrality dependence of the spectral shape is an important tool to understand the energy loss mechanism. The ATLAS detector at the LHC accumulated 150µb-1 of lead-lead data at 2.76 TeV per nucleon-nucleon pair. Due to the excellent...Go to contribution page
-
Peter Arnold (University of Virginia)16/08/2012, 14:40Oral PresentationPrevious top-down studies of jet stopping in strongly-coupled QCD-like plasmas with gravity duals have been in the infinite 't Hooft coupling limit $\lambda \to \infty$. They have found that, though a wide range of jet stopping distances are possible depending on initial conditions, the maximum jet stopping distance $\ell_{\rm max}$ scales with energy as $E^{1/3}$ at large energy. But it has...Go to contribution page
-
Dr Christian Schmidt (Universitaet Bielefeld)16/08/2012, 14:40Oral PresentationWe calculate electric and baryonic charge fluctuations on the lattice. Results have been obtained with the highly improved staggered quark action (HISQ) and almost physical quark masses on lattices with temporal extent of N_tau=6,8,12. Higher cumulants of the net-charge distributions are increasingly dominated by a universal scaling behavior, which is arising due to a critical point of QCD in...Go to contribution page
-
Subhash Singha (Department of Atomic Energy (IN))16/08/2012, 14:40Hadron thermodynamics and chemistryOral PresentationThe ALICE experiment at the LHC has measured the production of strange hadrons and resonances in Pb-Pb and pp collisions at unprecedentedly high beam energies. The study of strange hadrons and resonances helps us to understand the medium properties and its evolution at dierent stages. We will present the pT spectra and yields at mid-rapidity for strange hadrons (, labda, xi, omega, their...Go to contribution page
-
Dr Xiaoping Zhang (Tsinghua University)16/08/2012, 15:00Global and collective dynamicsOral PresentationStrange hadron production is sensitive to parton dynamics in nucleus-nucleus collisions. In particular, the strange quark production rate and its subsequent evolution in the dense partonic medium depend on the beam energy and the net baryon density. We will present STAR measurements of $K^{0}_{s}$, $K^{\pm}$, $\phi$, $\Lambda$, $\Xi$, and $\Omega$ at mid-rapidity from Au+Au collisions at...Go to contribution page
-
Dr Claudia Ratti (Torino University)16/08/2012, 15:00QCD at finite temperature and densityOral PresentationWe present our estimate for the charm quark's contribution to the equation of state and to the fluctuations of conserved charges. Our results are based on simulations with dynamical charm at physical quark masses. We also address the question, to what extent staggered simulations are reliable. We give comparisons with the Wilson formulation as well as with results using dynamical overlap fermions.Go to contribution page
-
Evan Sangaline (UC Davis)16/08/2012, 15:00The suppression of high $p_{T}$ hadrons in 200 GeV Au+Au collisions at RHIC has been seen as a signature for a partonic medium being formed. The evolution of this key QGP signature is a powerful tool for studying the QCD phase structure in the RHIC Beam Energy Scan (BES). In this talk, we will present measurements of identified $\pi^{\pm}$, $K^{\pm}$, and $p(\bar{p})$ and unidentified charged...Go to contribution page
-
Krishna Rajagopal (MIT)16/08/2012, 15:00A holographic calculation of the quenching of a beam of gluons with typical momenta q shining through strongly coupled quark-gluon plasma shows that such a beam is attenuated rapidly over a distance of order q^{1/3} (pi T)^{-4/3} as it propagates at the speed of light, shedding trailing sound waves with momenta of order (pi T). At larger and larger q, the trailing sound wave becomes less and...Go to contribution page
-
Benjamin Doenigus (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))16/08/2012, 15:20Hadron thermodynamics and chemistryOral PresentationThe excellent particle identification capabilities of the ALICE experiment allow the studies of (anti) matter and hyper-matter production. (Anti) deuterons, tritons, 3He and 4He as well as the corresponding antinuclei can be cleanly identified based on their specific energy loss in the Time Projection Chamber and velocity information in the Time-Of-Flight detector. The (anti) hyper-triton...Go to contribution page
-
Dr Yacine Mehtar-Tani (IPhT-Saclay)16/08/2012, 15:20Oral PresentationThe recent jet measurements at RHIC and the LHC have challenged the heavy-ion community to a better understanding of jet fragmentation in the presence of the Quark-Gluon-Plasma (QGP). Jet fragmentation in vacuum is well described by perturbative QCD and is characterized by color coherence effects that lead to the angular ordering of successive branchings along the jet. To investigate the...Go to contribution page
-
Swagato Mukherjee (Brookhaven National Laboratory)16/08/2012, 15:20Oral PresentationTraditionally the freeze-out conditions in the heavy-ion collision experiments are obtained by comparing the experimentally measured hadron yields with that from the statistical hadron resonance gas model. In this talk we will present how the freeze-out chemical potentials and the freeze-out temperature can be obtained in a model independent way from ab-initio lattice QCD calculations by...Go to contribution page
-
Dr Prashant Shukla (Bhabha Atomic Research Centre (IN))16/08/2012, 15:20Oral PresentationThe hadrons containing strange quark(s) are among the most interesting probes of the hot and dense matter produced in heavy ion collisions at Relativistic Heavy Ion Collider (RHIC). While p+p collisions are used as a baseline for comparison with heavier collision systems and provide a cross check for pQCD calculations, d+Au collisions are used to study cold nuclear matter effects for mesons...Go to contribution page
-
Alessandro Buzzatti (Columbia University)16/08/2012, 15:40Oral PresentationThe CUJET1.0 Monte Carlo Jet Energy loss model is applied to predict the jet flavor, centrality and density dependence of the nuclear modification factor $R_{AA}$ and the elliptic flow $v_2$ at RHIC and LHC. Running coupling effects due to combined $x$, $k_\perp$ and $q_\perp$ evolution are included for the first time in the dynamical DGLV opacity expansion framework and are shown to provide a...Go to contribution page
-
Ms Yuhui Zhu (Shanghai Institute of Applied Physics)16/08/2012, 15:40Global and collective dynamicsOral PresentationThe hyperon-nucleon(Y-N) interaction is of great physical interest because it introduces a new quantum number strangeness in nuclear matter. It is predicted to be the decisive interaction in some high-density matter systems, such as neutron stars [1]. RHIC, the Relativistic Heavy Ion Collider, provides an ideal laboratory to study Y-N interaction because hyperons and nucleons are abundantly...Go to contribution page
-
Dr Robert Pisarski (Brookhaven National Lab.)16/08/2012, 15:40QCD at finite temperature and densityOral PresentationAn effective theory for the region near the critical temperature, the "semi"-QGP, has been developed. In QCD, this is dominated by the partial ionization of color, up to temperatures about 300 MeV. Using the effective model, the temperature dependence for the ratio of the shear viscosity, to the entropy, is computed. This predicts a sharp increase in this ratio between ~ 160 MeV and ~ 300 MeV.Go to contribution page
-
Alexei Bazavov (B)16/08/2012, 15:40Oral PresentationThe physics of the Quark-Gluon Plasma (QGP), currently explored experimentally in heavy-ion collisions, is non-perturbative for temperatures below approximately 1 GeV. One of the fundamental properties of the QGP, the Equation of State, is a subject of extensive studies in lattice QCD. The lattice QCD Equation of State is now an essential requirement for the correct hydrodynamic modeling of...Go to contribution page
-
Prof. Vincenzo Greco (University of Catania)16/08/2012, 16:00We 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
-
Riccardo Russo (Universita e INFN (IT))16/08/2012, 16:00Open 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
-
Dirk Rischke (U)16/08/2012, 16:00In 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
-
J. Matthew Durham (Los Alamos National Laboratory)16/08/2012, 16:00The 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
-
Prof. Yuanfang Wu (Institute of Particle Physics, CCNU, Wuhan China)16/08/2012, 16:00The 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
-
Taku Gunji (University of Tokyo (JP))16/08/2012, 16:00The 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
-
499. A novel high momentum particle identification detector for the next generation ALICE experimentAustin Vincent Harton (Chicago State University (US))16/08/2012, 16:00A 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
-
Dr Yuji Sakai (RIKEN)16/08/2012, 16:00We 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
-
Eric Mannel (B)16/08/2012, 16:00Conceived 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
-
Kurt Jung (Purdue University (US))16/08/2012, 16:00Dileptons 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
-
Michael McCumber (University of Colorado)16/08/2012, 16:00The 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
-
Dr Thomas Kiess (self)16/08/2012, 16:00We 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
-
Nikola for the ALICE-FoCal collaboration Poljak (NIKHEF/Univeristy of Utrecht)16/08/2012, 16:00A 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
-
Xiangrong Zhu (Central China Normal University CCNU (CN))16/08/2012, 16:00Neutral 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
-
Dr Frederique Grassi (Universidade de Sao Paulo, Brazil)16/08/2012, 16:00We 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
-
You Zhou (Nikhef and Utrecht University (NL))16/08/2012, 16:00The $\phi$-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
-
Mr Yuji Hirono (The University of Tokyo)16/08/2012, 16:00Quantum 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
-
Joshua Ilany (Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA)16/08/2012, 16:00Anomalous 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
-
Shikshit Gupta (University of Jammu)16/08/2012, 16:00Information 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
-
Mr Christopher Yaldo (Wayne State University)16/08/2012, 16:00The 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
-
Heikki Mäntysaari (University of Jyväskylä, Department of Physics)16/08/2012, 16:00Single 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
-
Deepa Thomas (University of Utrecht (NL))16/08/2012, 16:00The 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
-
Wei Li (MIT)16/08/2012, 16:00Azimuthal 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
-
Mohammed Younus (Variable Energy Cyclotron Centre)16/08/2012, 16:00We 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
-
Bogdan Theodor Rascanu (Johann-Wolfgang-Goethe Univ.)16/08/2012, 16:00In 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
-
Alis Rodriguez Manso (NIKHEF (NL))16/08/2012, 16:00The 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
-
Dr Kenji Morita (Kyoto University)16/08/2012, 16:00We 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
-
Enrico Fragiacomo (Universita e INFN (IT))16/08/2012, 16:00The 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
-
Hui Wang (Michigan state university)16/08/2012, 16:00The 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
-
Michal Petran (Czech Technical University (CZ))16/08/2012, 16:00The 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
-
John Campbell (T)16/08/2012, 16:00Azimuthal 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
-
Andrej Ficnar (Columbia University in the City of New York)16/08/2012, 16:00We 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
-
jie zhao (lbl&sinap)16/08/2012, 16:00Dilepton 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
-
Xiangli Cui (U)16/08/2012, 16:00Di-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
-
387. Charge Asymmetry Dependency of $\pi^+/\pi^-$ Azimuthal Anisotropy in Au + Au Collisions at STARHongwei Ke (Central China Normal University)16/08/2012, 16:00A 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
-
Guo-Liang Ma (Shanghai INstitute of Applied Physics (SINAP), CAS)16/08/2012, 16:00With 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
-
Charles Riley (Yale University)16/08/2012, 16:00Three-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
-
Jocelyn Mlynarz (Wayne State University (US))16/08/2012, 16:00Charge 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
-
Michal Petran (Czech Technical University (CZ))16/08/2012, 16:00Almost 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
-
Peter Levai (Hungarian Academy of Sciences (HU))16/08/2012, 16:00The 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
-
Dr Alexandre Lebedev (Iowa State University)16/08/2012, 16:00Measurement 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
-
Mr Vasily Sazonov (University of Graz)16/08/2012, 16:00The 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
-
Christian Wesp (Goethe Universität Frankfurt)16/08/2012, 16:00One 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
-
Edward Shuryak (stony brook university)16/08/2012, 16:00For 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
-
Dr brijesh srivastava (Purdue University)16/08/2012, 16:00The 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
-
Kwangbok Lee (Losalamos National Laboratory)16/08/2012, 16:00$\Upsilon(1S+2S+3S)$ 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
-
Dr Armen Sedrakian (Frankfurt University)16/08/2012, 16:00I 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
-
Prof. Alexandru Jipa (Faculty of Physics, University of Bucharest)16/08/2012, 16:00Heavy-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
-
Damian Reynolds (S)16/08/2012, 16:00The 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
-
Stephen Horvat (Y)16/08/2012, 16:00The 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
-
Dr Irakli Garishvili (Lawrence Livermore National Laboratory)16/08/2012, 16:00Constraining 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
-
Dr Thomas Hell (Technische Universität München)16/08/2012, 16:00Recently, 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
-
Yi Wang (Department of Engineering Physics, Tsinghua University)16/08/2012, 16:00Data 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
-
Prof. Yuanfang Wu (Institute of Particle Physics, CCNU, wuhan China)16/08/2012, 16:00Higher 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
-
Prof. Yuanfang Wu (Institute of Particle Physics, CCNU, Wuhan, China)16/08/2012, 16:00Higher 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
-
Fiorella Fionda (Universita e INFN (IT))16/08/2012, 16:00The 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
-
Grazia Luparello (NIKHEF (NL))16/08/2012, 16:00The 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
-
Sandro Bjelogrlic (University of Utrecht (NL))16/08/2012, 16:00Due 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
-
Chanaka De Silva (Wayne State University)16/08/2012, 16:00Angular 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
-
Christoph Herold16/08/2012, 16:00We 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
-
Dr Juergen Eschke (GSI Helmholtzzentrum)16/08/2012, 16:00The 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
-
Taku for the ALICE-FOCAL Collaboration Gunji (University of Tokyo (JP))16/08/2012, 16:00The 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
-
Deepali Sharma (S)16/08/2012, 16:00Di-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
-
Tatsuya Chujo (University of Tsukuba (JP))16/08/2012, 16:00A 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
-
Mr Patrick Huck (CCNU/LBNL)16/08/2012, 16:00In 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
-
Mr Florian Senzel (Goethe-Universität Frankfurt)16/08/2012, 16:00Recent 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
-
Antonio Uras (Universite Claude Bernard-Lyon I (FR))16/08/2012, 16:00The 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
-
Nowo Riveli (O)16/08/2012, 16:00The 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
-
Bikash Sinha (V)16/08/2012, 16:00We 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
-
Sarah Campbell (I)16/08/2012, 16:00The 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
-
Baldo Sahlmueller16/08/2012, 16:00Direct 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
-
Ekaterina Retinskaya (IPhT Saclay)16/08/2012, 16:00We 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
-
Gyulnara Eyyubova (University of Oslo (NO))16/08/2012, 16:00Directed 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
-
Akihiko Monnai (The University of Tokyo)16/08/2012, 16:00The 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
-
Pasi Huovinen (Johann Wolfgang Goethe-Universität)16/08/2012, 16:00In 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
-
Mr Zhiming Li (Institute of Particle Physics, CCNU, Wuhan, China)16/08/2012, 16:00Higher 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
-
Mate Csanad (for the TOTEM Collaboration)16/08/2012, 16:00The 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
-
Hamza Berrehrah (Subatech)16/08/2012, 16:00One 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
-
Monika Sharma (Vanderbilt University (US))16/08/2012, 16:00The 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
-
Denise Aparecida Moreira De Godoy (Universidade de Sao Paulo (BR))16/08/2012, 16:00Heavy 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
-
Carlos Perez Lara (Nikhef, Utrecht University)16/08/2012, 16:00Anisotropic 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
-
Maja Katarzyna Mackowiak-Pawlowska (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00NA61/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
-
Dr Anar Rustamov (Frankfurt University)16/08/2012, 16:00The 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
-
Prof. Ricardo Rodriguez (Ave Maria University)16/08/2012, 16:00We 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
-
Hideaki Iida (Kyoto University)16/08/2012, 16:00Possible 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
-
Dr Takashi Hachiya (RIKEN)16/08/2012, 16:00The 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
-
Anthony Robert Timmins (University of Houston (US))16/08/2012, 16:00The 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
-
Dr Harri Niemi (University of Jyväskylä, Department of Physics)16/08/2012, 16:00Nowadays, 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
-
Koichi Murase (The University of Tokyo)16/08/2012, 16:00To 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
-
Xu-Guang Huang (Institute for Theoretical Physics)16/08/2012, 16:00We 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
-
Stefan Thomas Heckel (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00Results 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
-
Christoph Mayer (Polish Academy of Sciences (PL))16/08/2012, 16:00The 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
-
Kouji Kashiwa (RIKEN BNL Research Center)16/08/2012, 16:00We 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
-
Philipe Mota (Goethe Universität Frankfurt)16/08/2012, 16:00In 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
-
354. Fluctuating Hydrodynamics Confronts the Rapidity Dependence of Transverse Momentum FluctuationsSean Gavin (Wayne State University)16/08/2012, 16:00Interest 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
-
Taku Gunji (University of Tokyo (JP))16/08/2012, 16:00We 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
-
Dr Sascha Vogel (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00One 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
-
Dr Aneta Iordanova (University of California, Riverside)16/08/2012, 16:00One 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
-
Elena Petreska (Graduate Center/Baruch College CUNY)16/08/2012, 16:00A 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
-
Paul Hohler (Texas A&M University)16/08/2012, 16:00The 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
-
Oliver Fochler (Goethe-Universität Frankfurt)16/08/2012, 16:00We 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
-
Prof. Masayuki Asakawa (Osaka University)16/08/2012, 16:00We 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
-
Daisuke Watanabe (University of Tsukuba (JP))16/08/2012, 16:00Heavy-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
-
Dr Edouard Kistenev (Brookhaven National Laboratory)16/08/2012, 16:00The 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
-
Dmitri Kotchetkov (Ohio University (US))16/08/2012, 16:00The 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
-
Sungtae Cho16/08/2012, 16:00We 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
-
Mr Philip Rau (Goethe University Frankfurt, Germany)16/08/2012, 16:00With 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
-
Francesco Becattini (Unversity of Florence), Mr Tim Schuster (Yale University (US))16/08/2012, 16:00We 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
-
George Moschelli (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00We 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
-
Alex Mwai (Stony Brook University)16/08/2012, 16:00HBT 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
-
Gunnar Gräf (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00We 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
-
Dr Daniel Kikola (Purdue University)16/08/2012, 16:00Heavy 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
-
Dr Sascha Vogel (Frankfurt Institute for Advances Studies)16/08/2012, 16:00One 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
-
Sanghoon Lim (Yonsei University)16/08/2012, 16:00The 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
-
Mr Nirupam Dutta (Doctoral Student, Bielefeld University)16/08/2012, 16:00In 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
-
Dr Hendrik van Hees (Goethe University Frankfurt)16/08/2012, 16:00Heavy 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
-
Prof. Feng Liu () College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, China)16/08/2012, 16:00One 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
-
Jan Cepila (Czech Technical University (CZ))16/08/2012, 16:00We 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
-
Norbert Novitzky (Helsinki Institute of Physics (FI))16/08/2012, 16:00Neutral-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
-
amal sarkar (Indian Institute of Technology, Mumbai)16/08/2012, 16:00The 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
-
NIHAR R SAHOO (Variable Energy Cyclotron Centre)16/08/2012, 16:00To 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
-
Philipp Gubler (RIKEN)16/08/2012, 16:00Quarkonia 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
-
Rone Andrade (Universidade de São Paulo USP)16/08/2012, 16:00In 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
-
Guang-You Qin (Duke University/Wayne State University)16/08/2012, 16:00Jets 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
-
Dr Jan Steinheimer-Froschauer (Lawrence Berkeley National Laboratory)16/08/2012, 16:00Using 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
-
Matthew Donald Steinpreis (Ohio State University (US))16/08/2012, 16:00Femtoscopic 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
-
Jonathan Bouchet (Kent State University), Joseph Vanfossen (Kent State University)16/08/2012, 16:00Heavy 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
-
Prof. Ramona Vogt (LLNL and UC Davis)16/08/2012, 16:00We 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
-
John Novak (M)16/08/2012, 16:00It 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
-
Dr Marlene Nahrgang16/08/2012, 16:00Strong 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
-
Liliana Apolinário (Universidade de Santiago de Compostela)16/08/2012, 16:00In 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
-
Dr Sascha Vogel (Frankfurt Institute for Advanced Studies)16/08/2012, 16:00One 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
-
Prof. Toshitaka Tatsumi (Department of Physics, Kyoto University)16/08/2012, 16:00Recently 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
-
Ioannis Bouras (University of Frankfurt a.M.)16/08/2012, 16:00The 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
-
Dr Cesar L. for the PHENIX Collaboration Silva (Los Alamos National Lab)16/08/2012, 16:00The 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
-
Kenta Shigaki (Hiroshima University (JP))16/08/2012, 16:00A 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
-
Mr L. Chanaka De Silva (University of Houston)16/08/2012, 16:00Triggered 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
-
Prof. Tomoki Endo (Division of Physics, Department of General Education, Kagawa National College of Technology, Japan.)16/08/2012, 16:00Quark 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
-
Joshua Konzer16/08/2012, 16:00The 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
-
Mauro Rogerio Cosentino (Lawrence Berkeley National Lab. (US))16/08/2012, 16:00Photons 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
-
Wangmei Zha (U)16/08/2012, 16:00The 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
-
Marcel Araujo Silva Figueredo (Universidade de Sao Paulo (BR))16/08/2012, 16:00J/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
-
Thomas Lang16/08/2012, 16:00We 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
-
Michal Vajzer (Acad. of Sciences of the Czech Rep. (CZ))16/08/2012, 16:00Collimated 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
-
Dr J. Ali Hanks (PHENIX)16/08/2012, 16:00The 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
-
Ying Lu (University of Maryland (US))16/08/2012, 16:00The 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
-
Di-Lun Yang (D)16/08/2012, 16:00The 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
-
Dosatsu Sakata (University of Tsukuba (JP))16/08/2012, 16:00In 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
-
Pengfei Zhuang (Tsinghua University)16/08/2012, 16:00Different 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
-
Hua Pei (University of Illinois at Chicago)16/08/2012, 16:00Angular 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
-
Akira Ohnishi (Kyoto University)16/08/2012, 16:00We 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
-
W.J. Llope (Rice University)16/08/2012, 16:00In 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
-
Sudipan De (Department of Atomic Energy (IN))16/08/2012, 16:00Multiple 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
-
Dr Huang Bingchu (Brookhaven National Lab)16/08/2012, 16:00An 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
-
Frasher Loshaj (S)16/08/2012, 16:00We 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
-
Emilia Leogrande (Universita e INFN (IT))16/08/2012, 16:00Luminosity 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
-
Edward Shuryak (stony brook university)16/08/2012, 16:00Confinement 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
-
Ryohji (for the PHENIX collaboration) Akimoto (University of Tokyo)16/08/2012, 16:00Heavy 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
-
Shawn Whitaker (Iowa State University)16/08/2012, 16:00The 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
-
Zubayer Ahammed (Department of Atomic Energy (IN))16/08/2012, 16:00\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
-
Christoph Baumann (Johann-Wolfgang-Goethe Univ. (DE)), Markus Kohler (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))16/08/2012, 16:00Direct 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
-
Satyajit Jena (IIT- Indian Institute of Technology (IN))16/08/2012, 16:00Charge 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
-
Satoshi Yano (Hiroshima University (JP))16/08/2012, 16:00The $\omega$ 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
-
Tomasz Bold (AGH Univ. of Science amp; Technology, Krakow)16/08/2012, 16:00The 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
-
Bernard Richard Hicks (Yale University (US))16/08/2012, 16:00Heavy 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
-
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, 16:00Measurements 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
-
Sidharth Kumar Prasad (Wayne State University (US))16/08/2012, 16:00We 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
-
Rongrong Ma (Yale University (US))16/08/2012, 16:00Jet 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
-
Szymon Mateusz Pulawski (University of Silesia (PL))16/08/2012, 16:00Preliminary 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
-
Benjamin Bannier16/08/2012, 16:00Photons 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
-
Karoly Uermoessy (Hungarian Academy of Sciences (HU))16/08/2012, 16:00For 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
-
Dr Daniel Kikola (Purdue University)16/08/2012, 16:00Anisotropic 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
-
Dr Paul Stankus (Oak Ridge National Lab)16/08/2012, 16:00The 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
-
Jussi Auvinen (University of Jyväskylä)16/08/2012, 16:00A 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
-
Clint Young (McGill University)16/08/2012, 16:00Jets 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
-
Prof. Jens Jorgen Gaardhoje (Niels Bohr Institute)16/08/2012, 16:00We 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
-
Ms Dronika Solanki (University of rajasthan)16/08/2012, 16:00The 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
-
Fengchu Zhou (Central China Normal University (CN))16/08/2012, 16:00A 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
-
Paraskevi Ganoti (Oak Ridge National Laboratory - (US))16/08/2012, 16:00In 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
-
Mr Matthias Drews (Technische Universitaet Muenchen)16/08/2012, 16:00Recently 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
-
Gyulnara Eyyubova (University of Oslo (NO))16/08/2012, 16:00Recently 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
-
Amaresh Jaiswal (Tata Institute of Fundamental research, Mumbai)16/08/2012, 16:00Starting 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
-
Mr Risto Paatelainen (University of Jyvaskyla, Finland)16/08/2012, 16:00The 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
-
Erike Cazaroto (University of Sao Paulo)16/08/2012, 16:00At 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
-
Dr Min He (Cyclotron Institute, Texas A&M University)16/08/2012, 16:00We 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
-
Mauricio Martinez Guerrero (Universidade de Santiago de Compostela)16/08/2012, 16:00Radiative 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
-
Alexander Schmah (Lawrence Berkeley National Lab)16/08/2012, 16:00The 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
-
Joshua Konzer16/08/2012, 16:00Particle 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
-
Anthony Robert Timmins (University of Houston (US))16/08/2012, 16:00The 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
-
Fuming Liu (Central China Normal University)16/08/2012, 16:00We 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
-
Tamal Kumar Mukherjee (Institute of High Energy Physics, TPCSF)16/08/2012, 16:00We 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
-
Jan Uphoff (Goethe University Frankfurt)16/08/2012, 16:00The 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
-
Mr Hongxi Xing (Institute of Particle Physics, Central China Normal University)16/08/2012, 16:00Within 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
-
Hidemitsu Asano (Kyoto Univ.)16/08/2012, 16:00The 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
-
Chi Yang (U)16/08/2012, 16:00A 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
-
Libor Skoda (Czech Technical University (CZ))16/08/2012, 16:00We 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
-
Pilar Staig (Stony Brook University)16/08/2012, 16:00We 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
-
Kyohei Fukuda (Nagoya)16/08/2012, 16:00We 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
-
Mr Abhisek Sen (Georgia State University)16/08/2012, 16:00$J/\psi$ 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
-
Lei Ding (I)16/08/2012, 16:00The 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
-
Antonio Uras (Universite Claude Bernard-Lyon I (FR))16/08/2012, 16:00Strangeness 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
-
Mr Mukesh Mukesh Kumar Sharma (University Of Jammu)16/08/2012, 16:00The 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
-
Mr Guangyao Chen (Cyclotron Insitute and Department of Physics&Astronomy, Texas A&M University)16/08/2012, 16:00A 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
-
Dr Martin Purschke (BROOKHAVEN NATIONAL LABORATORY, for the PHENIX Collaboration)16/08/2012, 16:00The 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
-
Bing Xia (O)16/08/2012, 16:00Deuteron-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
-
Pat Kenny (University of Kansas (US))16/08/2012, 16:00Ultra-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
-
Mr Yan Yang (Ohio State University)16/08/2012, 16:00Correlations 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
-
Dr Dilan Madagodahettige Don (STAR (Creighton University))16/08/2012, 16:00Ultraperipheral 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
-
Dr Chin-Hao Chen (PHENIX Collaboration)16/08/2012, 16:00Heavy 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
-
Urs Wiedemann (CERN)16/08/2012, 16:00We 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
-
Patrick Simon Reichelt (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00The 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
-
Dr Zhi Qiu (Ohio State University)16/08/2012, 16:00The 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
-
Yukinao Akamatsu (Nagoya University)16/08/2012, 16:00Single 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
-
Kazuhiro Watanabe (The University of Tokyo)16/08/2012, 16:00We 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
-
Huichao Song (The Ohio State University)16/08/2012, 16:00Viscous 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
-
Marzia Rosati (Iowa State University)16/08/2012, 16:00The 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
-
Mr Deke Sun (Purdue University)16/08/2012, 16:00There 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
-
Boris Tomasik (Univerzita Mateja Bela (SK))16/08/2012, 16:00A 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
-
Prof. Rolf Scharenberg (Purdue University)16/08/2012, 16:00The 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
-
Koichi Murase (The University of Tokyo)16/08/2012, 16:00To 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
-
Bikash Sinha16/08/2012, 16:00The 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
-
Martin Schulc (Czech Technical University (CZ))16/08/2012, 16:00We 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
-
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, 16:00The 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
-
Dr Supriya Das (Bose Institute)16/08/2012, 16:00Recent 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
-
Giorgio Torrieri (JW Goethe Universitat, Frankfurt)16/08/2012, 16:00In 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
-
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, 16:00We 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
-
Michal Petran (Czech Technical University (CZ))16/08/2012, 16:00Soft 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
-
Dr Nasser Demir (Kuwait University)16/08/2012, 16:00We 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
-
Robert Lang (TUM)16/08/2012, 16:00Collision 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
-
101. Signature of liquid-gas phase transition and critical behavior in projectile multifragmentationMs Rupalim Talukdar (Department of Physics, Gauhati University, India)16/08/2012, 16:00A 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
-
601. Silicon pixel and strip detector development for the upgrade of the ALICE Inner Tracking SystemGiacomo Contin (Universita e INFN (IT))16/08/2012, 16:00The 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
-
Jiayin Sun (Stony Brook University)16/08/2012, 16:00Dielectron 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
-
Nicole Apadula16/08/2012, 16:00Since 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
-
Mr Raktim Abir (Saha Institute of Nuclear Physics)16/08/2012, 16:00Most 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
-
Dhevan Raja Gangadharan (Ohio State University (US))16/08/2012, 16:00Quantum 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
-
Björn Bäuchle (FIAS Frankfurt)16/08/2012, 16:00Photons, 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
-
Prof. Sanjay Ghosh (Bose Institute)16/08/2012, 16:00Collective 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
-
Anne Sickles (Brookhaven)16/08/2012, 16:00Reconstructed 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
-
Prof. Jamie Nagle (University of Colorado)16/08/2012, 16:00The 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
-
Dr Hiroshi Masui (LBNL)16/08/2012, 16:00Elliptic 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
-
Cesar Luiz da Silva (L)16/08/2012, 16:00The 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
-
Bikash Sinha16/08/2012, 16:00The 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
-
Sener Ozonder (University of Minnesota)16/08/2012, 16:00We 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
-
Laura Patel16/08/2012, 16:00Production 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
-
Bhanu Sharma (Panjab University)16/08/2012, 16:00The 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
-
Ms Neha Shah (University of California Los Angeles)16/08/2012, 16:00The 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
-
Sanshiro for the PHENIX experiments Mizuno (University of Tsukuba, RIKEN (JP))16/08/2012, 16:00Azimuthal 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
-
Dr Kun Liu (Los Alamos National Laboratory)16/08/2012, 16:00E906/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
-
Tinku Sarkar - Sinha (Saha Institute of Nuclear Physics (IN))16/08/2012, 16:00The 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
-
Min Jung Kweon (Ruprecht-Karls-Universitaet Heidelberg (DE))16/08/2012, 16:00Heavy 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
-
Tomas Aronsson (Yale University (US))16/08/2012, 16:00High-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
-
Dr Umme Jamil Begum (Debraj Roy College, Golaghat, Assam, India)16/08/2012, 16:00Charm 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
-
Sooraj Krishnan Radhakrishnan (State University of New York (US))16/08/2012, 16:00The 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
-
Mr Dustin Hemphill (Purdue University)16/08/2012, 16:00We 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
-
Dr Hanzhong Zhang (Institute of Particle Physics, Central China Normal University)16/08/2012, 16:00The 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
-
Jinfeng Liao (Indiana University & RIKEN BNL Research Center)16/08/2012, 16:00One 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
-
Mr Hiroshi Nakagomi (Univ. of Tsukuba)16/08/2012, 16:00In 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
-
Michael Winn (Ruprecht-Karls-Universitaet Heidelberg (DE))16/08/2012, 16:00We 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
-
Matthew Lamont (BNL)16/08/2012, 16:00Over 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
-
Tobias Tischler (Goethe-Universität, Frankfurt)16/08/2012, 16:00The 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
-
J. Matthew Durham (Los Alamos National Laboratory)16/08/2012, 16:00Two 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
-
Jan Kopfer (Universität Wuppertal)16/08/2012, 16:00The 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
-
Sourendu Gupta (Tata Institute of Fundamental Research)16/08/2012, 16:00We 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
-
298. The Tungsten-Scintillating Fiber Accordion Electromagnetic Calorimeter for the sPHENIX DetectorDr Craig Woody (Brookhaven National Lab)16/08/2012, 16:00The 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
-
Dr Song Shu (Faculty of Physics and Electronic Technology, Hubei University, China)16/08/2012, 16:00We 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
-
Bikash Sinha16/08/2012, 16:00ALICE, 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
-
Gergely Barnafoldi (Hungarian Academy of Sciences (HU))16/08/2012, 16:00Asymmetric 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
-
Giorgio Torrieri (JW Goethe Universitat, Frankfurt)16/08/2012, 16:00We 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
-
Prof. Angel Gomez Nicola (Universidad Complutense Madrid)16/08/2012, 16:00I 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
-
Chun Shen (Ohio State University)16/08/2012, 16:00Photons 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
-
Dr Gabor David (Brookhaven National Laboratory)16/08/2012, 16:00While 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
-
Dr Bhaswar Chatterjee (Physical Research Laboratory, Ahmedabad, India)16/08/2012, 16:00We 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
-
Richard Petti (S)16/08/2012, 16:00The 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
-
Takahiro Sasaki (K)16/08/2012, 16:00We 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
-
Jason Glyndwr Ulery (Johann-Wolfgang-Goethe Univ. (DE))16/08/2012, 16:00Tri-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
-
Mate Csanad16/08/2012, 16:00The 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
-
Bin Zhang (Arkansas State University)16/08/2012, 16:00The 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
-
Jorge Noronha (U)16/08/2012, 16:00We 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
-
Ioannis Bouras (University of Frankfurt a.M.)16/08/2012, 16:00Using 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
-
Anton Wiranata (L)16/08/2012, 16:00In 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
-
Claude Andre Pruneau (Department of Physics and Astronomy)16/08/2012, 16:00We 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
-
Marton Vargyas (ELTE)16/08/2012, 16:00PHENIX 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
-
Piotr Bozek16/08/2012, 16:00Results 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
-
Laszlo Pal Csernai16/08/2012, 16:00Flow 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
-
Theodore Koblesky Theo (University of Colorado)16/08/2012, 16:00Two 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
-
Mr Jingbo Wang (Department of Engineering Physics, Tsinghua University, Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Beijing 100084, China)16/08/2012, 16:00The 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
-
Jai Salzwedel (Ohio State University (US))16/08/2012, 16:00In 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
-
Elizabeth Oldag (UT Austin, STAR Collaboration)16/08/2012, 16:00Correlations 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
-
Andrew Marshall Adare (Yale University (US))16/08/2012, 16:00Observables 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
-
Prof. Seto Richard (University of California, Riverside)16/08/2012, 16:00Studies 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
-
Georg Wolschin (Heidelberg University)16/08/2012, 16:00We 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
-
Ms P S Saumia (Institute of Physics)16/08/2012, 16:00We 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
-
Mr Manuel Lorenz (Goethe University Frankfurt)16/08/2012, 16:00The 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
-
Mr Zachary Wolff (Purdue University)16/08/2012, 16:00Comparing 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
-
Jacquelyn Noronha-Hostler (U)16/08/2012, 16:00vSPheRIO 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
-
Michael Tannenbaum (Brookhaven National Laboratory (US))16/08/2012, 16:00\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
-
Boris Tomasik (Univerzita Mateja Bela (SK))16/08/2012, 16:00We 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
-
Dr Phil Plait16/08/2012, 20:45Oral Presentation
-
lokesh kumar (Kent State University)17/08/2012, 08:30Oral Presentation
-
Edward O'Brien (BNL)17/08/2012, 08:50Oral Presentation
-
Szabolcs Borsanyi (University of Wuppertal)17/08/2012, 09:10Oral Presentation
-
Vladimir Skokov (Brookhaven national laboratory)17/08/2012, 09:30Oral Presentation
-
17/08/2012, 09:50
-
Hannah Petersen17/08/2012, 10:05Oral Presentation
-
Andrew Marshall Adare (Yale University (US))17/08/2012, 10:30Oral Presentation
-
Cyrille Marquet, Cyrille Marquet (Theory Division - CERN), Cyrille Michel Marquet (Universidade de Santiago de Compostela (ES))17/08/2012, 11:25Oral Presentation
-
Abhay Deshpande (Stony Brook University)17/08/2012, 11:50Oral Presentation
-
Ho-Ung Yee (SUNY, Stony Brook)17/08/2012, 12:15Oral Presentation
-
Dr Yoshimasa Hidaka (RIKEN Nishina Center)17/08/2012, 14:00Oral PresentationWe discuss the phase diagram of quantum chromodynamics (QCD) at finite T and finite quark chemical potential \mu. In particular, we focus on the QCD critical point(s), which has attracted considerable attention in its search at the relativistic heavy ion collision experiments. However, not only the location, but even the existence has not yet been settled. In this talk, we show that the...Go to contribution page
-
Francesco Noferini (Universita e INFN (IT))17/08/2012, 14:00Oral PresentationThe anisotropic flow of identified particles is an important observable to probe the freeze-out properties, the parton energy loss and the partonic phase of the system created in heavy-ion collisions. We report on the elliptic and triangular flow measurements for a number of identified particles such as charged pions, kaons and (anti-)protons, as well as K0s , Λ/anti-Λ, Ξ, and Ω. The results...Go to contribution page
-
Alessandro Grelli (University of Utrecht (NL))17/08/2012, 14:00Oral PresentationThe properties of the hot and dense QCD medium formed in ultra-relativistic heavy ion collisions, as well as the mechanism of in-medium partonic energy loss, can be accessed via the measurement of the nuclear modification factor of particle production. The measurement of D meson production provides key tests of parton energy-loss models, which predict that charm quarks should experience less...Go to contribution page
-
Prof. Huan Huang (UCLA, For the STAR Collaboration)17/08/2012, 14:00Experiment upgrades, new facilities, and instrumentationOral PresentationThe STAR Collaboration is scheduled to complete the Heavy Flavor Tracker (HFT) and the Muon Telescope Detector (MTD) upgrades by 2014. These detectors will greatly enhance the STAR physics capability to measure heavy quark collectivity and correlations using topologically reconstructed charm hadrons and heavy quark decay e-muon correlations. In addition, measurements of the quarkonium muon...Go to contribution page
-
Jinfeng Liao (Indiana University & RIKEN BNL Research Center)17/08/2012, 14:00We report on a recently proposed scenario for thermalization of hot QCD matter after the "Little Bang" in heavy ion collisions. A distinctive feature of the pre-equilibrium system (the Glasma) is the high over-population of phase space for gluons, which we argue plays a central role for the thermalization of the Quark-Gluon Plasma. In particular, the over-population (1) coherently amplifies...Go to contribution page
-
Mr Matthew Sievert (The Ohio State University)17/08/2012, 14:20We propose a new mechanism for generating a single transverse spin asymmetry (STSA) in polarized proton-proton and proton-nucleus collisions in the high-energy scattering approximation. In this framework the STSA originates from the q -> q G splitting in the projectile (proton) light-cone wave function followed by a perturbative (C-odd) odderon interaction, together with a C-even...Go to contribution page
-
Eric Andrew Appelt (Vanderbilt University (US))17/08/2012, 14:20Correlations and fluctuationsOral PresentationThe elliptic flow anisotropies of charged particles and neutral pions (pi0s) have been measured by the CMS collaboration for PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV. The second Fourier components of the anisotropic azimuthal distribution are obtained using an event-plane technique for pi0s and four different analysis techniques for charged particles: event plane,...Go to contribution page
-
Mr David Tlusty (PhD student)17/08/2012, 14:20Oral PresentationIn relativistic heavy ion collisions at RHIC, heavy quarks are expected to be created from initial hard scatterings. Their large masses are not easily affected by the strong interaction with QCD medium, thus they carry clean information from the system at early stage. The interaction between heavy quarks and the medium is sensitive to the medium dynamics, therefore heavy quarks are suggested...Go to contribution page
-
Rajiv V Gavai (Tata Institute, Mumbai, India)17/08/2012, 14:20Exploring the QCD phase diagramOral PresentationWe simulate QCD with two light dynamical quarks on a 32^3 X 8 lattice by tuning the current quark mass such that the Goldstone pion mass is about 230 MeV. Earlier results of our Mumbai group corresponded to the same physical parameters but were on coarser lattices at respectively 1.33 times and twice the lattice cut-off (a) compared to these simulations, thus permitting us a march towards...Go to contribution page
-
John Haggerty (Brookhaven National Laboratory)17/08/2012, 14:20Oral PresentationThe past decade of heavy ion physics at RHIC has produced many surprising discoveries and puzzles. Currently the experiments at the LHC are providing a first look at things to come: a burgeoning program for studying the Quark Gluon Plasma with reconstructed jets. The PHENIX collaboration is in the process of developing a long term plan involving a series of aggressive upgrades designed to...Go to contribution page
-
David Zaslavsky (Penn State University)17/08/2012, 14:40Oral PresentationWe have recently performed a numerical study of the forward correlations between the lepton-pair and associated hadrons in Drell-Yan process in pA collisions. Using the present knowledge of the dipole gluon distribution from the modified Golec-Biernat-Wusthoff model and from the solution of the Balitsky-Kovchegov evolution equation, we are able to compute and predict the forward correlations...Go to contribution page
-
Joseph Kapusta (University of Minnesota (US))17/08/2012, 14:40Exploring the QCD phase diagramOral PresentationHydrodynamic fluctuations are inherent in any small space-time varying system. They may be significantly impacted by the presence of a critical point in the QCD equation of state during the expansion phase of a heavy ion collision. Simple models are studied to gain insight into the essential physics. This study suggests which observables are most sensitive to a critical point, although much...Go to contribution page
-
Davide Caffarri (Universita e INFN (IT))17/08/2012, 14:40Oral PresentationThe ALICE experiment at the LHC studies Pb-Pb and pp collisions with the aim of investigating the properties of the high-density state of strongly-interacting matter, expected to be produced in Pb-Pb collisions. Heavy quarks are sensitive probes to test the medium properties, since they are formed at shorter time scale with respect to the deconfined state. The elliptic flow v2 of D meson...Go to contribution page
-
Tomasz Bold (AGH Univ. of Science amp; Technology, Krakow)17/08/2012, 14:40Oral PresentationThe measurement of the azimuthal anisotropy of charged particles obtained with the multi-particle correlations method will be presented and compared to the results obtained with the event plane method for Pb+Pb collisions at 2.76 TeV from the ATLAS experiment. Results on flow harmonics, determined from the cumulants of up to eight-particle correlations, will be shown over a wide transverse...Go to contribution page
-
Thomas Peitzmann (University of Utrecht (NL))17/08/2012, 14:40Oral PresentationAt the LHC the ALICE experiment is taking data in p+p, p+A and A+A collisions, which is providing unique insights on strongly interacting matter at an unprecedented energy density. Many important questions in heavy-ion physics will, however, remain unanswered in this first running period up to 2017. Only by increasing the luminosity beyond 10^27 and exploiting recent advances in technology...Go to contribution page
-
SABITA DAS (I)17/08/2012, 15:00Oral PresentationThe RHIC Beam Energy Scan (BES) program aims to study the QCD phase diagram. The main focus is to search for signals of the hypothesized critical point and the onset of the quark-hadron phase transition. The BES program covers a large part of the QCD phase diagram ($T$ vs.$mu_{B}$). With its uniform acceptance and excellent particle identification, STAR has collected large event samples in the...Go to contribution page
-
Dr Rachid Nouicer (Brookhaven National Laboratory (BNL))17/08/2012, 15:00Oral PresentationWell-calibrated penetrating probes are essential for investigating the properties of the hot, dense medium created in high-energy nuclear collisions at RHIC. One such probe are hadrons which carry heavy flavor (charm and bottom quarks). They are a powerful tool for studying the medium because they are generated early in the reaction and subsequently propagate through the created matter. Two...Go to contribution page
-
Dr Bowen Xiao17/08/2012, 15:00Oral PresentationRecently, by performing the complete next-to-leading order calculation, we have demonstrated the one-loop factorization for inclusive hadron productions in pA collisions in the saturation formalism. The differential cross section is written into a factorization form in the coordinate space at the next-to-leading order, while the naive form of the convolution in the transverse momentum space...Go to contribution page
-
Joseph Seele (RBRC)17/08/2012, 15:00Oral PresentationDuring 12 years of operations, PHENIX has discovered a strongly coupled QGP and studied many of its basic properties, examined effects in cold nuclear matter, measured the gluon helicity structure of the proton, and probed the proton transverse spin structure. PHENIX is planning a large upgrade for the next decade, sPHENIX, to answer many of the questions spurred by our discoveries during the...Go to contribution page
-
Takahito for the PHENIX Collaboration Todoroki (University of Tsukuba, RIKEN Nishina Center)17/08/2012, 15:00Oral PresentationTwo particle correlations provide key information on the interactions between hard-scattered partons and the hot dense medium created by ultra-relativistic heavy ion collisions. An important aspect of extracting jet functions from correlation measurements in heavy ion collisions is to estimate the underlying event background level and its modulation by vn. This is essential for the goal...Go to contribution page
-
Feng Yuan (LBNL)17/08/2012, 15:20Oral PresentationAs the foundation of high energy hadronic physics, QCD factorization enables us to separate the short distance perturbative physics from the long distance non-perturbative effects. Its prediction power relies on the universality of the parton distributions among different processes. In our recent publication [1], we established an effective factorization in hard processes in nuclei scattered...Go to contribution page
-
Shusu Shi (CCNU)17/08/2012, 15:20Exploring the QCD phase diagramOral PresentationThe exploration of the QCD phase diagram in the region of a possible phase transition between the Quark Gluon Plasma (QGP) and the hadron gas phase is one of the main goals of the RHIC Beam Energy Scan(BES). One of the most important observables from high-energy nuclear collisions to study the early evolution of the expanding system is the elliptic flow $v_{2}$. At the top RHIC energy,...Go to contribution page
-
Shanshan Cao (Duke University)17/08/2012, 15:20Heavy flavor and quarkonium productionOral PresentationHeavy quarks serve as valuable probes of the transport properties of the quark-gluon plasma created in relativistic heavy-ion collisions. Within the framework of a Langevin approach, coupled to a realistic 3D hydrodynamic calculation of the medium, we study the heavy quark energy loss due to quasi-elastic multiple scatterings. We extend this algorithm to include medium-induced gluon radiation...Go to contribution page
-
Prof. Misha Stephanov (UIC)17/08/2012, 15:20Correlations and fluctuationsOral PresentationWe describe intrinsic hydrodynamic fluctuations of the expanding boost-invariant (Bjorken) solution. We find that these fluctuations are correlated over a wide rapidity range due to the propagation of the sound modes, whose dispersion is nontrivial because of the expansion. Since the magnitudes of these correlations are proportional to viscosities, their measurement can, in principle, be...Go to contribution page
-
Roy Crawford Lemmon (Engin. & Phys. Sci. Research Coun. (GB))17/08/2012, 15:20Oral PresentationThe major long-term goal of the ALICE experiment at the LHC is to provide precision measurements of the properties of the Quark-Gluon Plasma, the state of deconfined matter produced in high-energy heavy-ion collisions. Experiments towards the characterisation of strongly interacting matter at high density will need to focus on rare probes and the study of their collective properties and...Go to contribution page
-
Dr Marlene Nahrgang17/08/2012, 15:40Exploring the QCD phase diagramOral PresentationStrong fluctuations in observables are believed to provide decisive signals for identifying phase transitions of QCD in relativistic heavy-ion collisions. To study this possibility under realistic conditions of the expansion and the cooling of the fireball we performed dynamic simulations within our approach of nonequilibrium chiral fluid dynamics. Based on an effective phase transition model,...Go to contribution page
-
Dr Rupa Chatterjee (University of Jyväskylä)17/08/2012, 15:40Thermal emission of photons from relativistic heavy ion collisions is believed to have a very strong temperature dependence and the high p_T thermal photons are expected to provide a glimpse of the early part of the expansion history when the system is still in the plasma phase. Photons having p_T > 1 GeV/c are thus specially suitable for probing fluctuations in the initial QCD matter density...Go to contribution page
-
Fernando Gardim (USP)17/08/2012, 15:40Correlations and fluctuationsOral PresentationWe investigate how the initial geometry of a heavy-ion collision is transformed into final flow observables by solving event-by-event ideal hydrodynamics with realistic fluctuating initial conditions. We study quantitatively to what extent anisotropic flow ($v_n$) is determined by the initial eccentricity $\varepsilon_n$ for a set of realistic simulations, and we discuss which definition of...Go to contribution page
-
Mihee Jo (Korea University (KR))17/08/2012, 15:40Heavy flavor and quarkonium productionOral PresentationMeasurements of the nuclear modification factor of mesons with open heavy flavor content in PbPb collisions at sqrt(sNN) = 2.76 TeV from the CMS experiment will be presented. These modification factors provide stringent constraints on the theoretical models of heavy quark energy loss. Until recently only indirect measurements of this effect existed, through single electrons from semileptonic...Go to contribution page
-
Johann Heuser (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))17/08/2012, 15:40Experiment upgrades, new facilities, and instrumentationOral PresentationThe Compressed Baryonic Matter (CBM) Experiment will explore the phase diagram of strongly interacting matter in the region of high net baryon densities. The experiment is laid out to process nuclear collisions at rates up to 10 MHz, the highest in the field. A unique wide spectrum of observables will be accessible, including rarest probes like hadrons containing charm quarks, or multi-strange...Go to contribution page
-
Shu Lin17/08/2012, 16:30New theoretical developmentsOral PresentationOne of the most difficult problems still to be understood is the mechanism of fast thermalization in heavy ion collisions. The problem involves dynamics in strong coupling regime and physics far from equilibrium, therefore is hardly tractable by usual method. The gauge/gravity duality naturally maps the formation of quark gluon plasma to another fundamental problem in black hole physics:...Go to contribution page
-
Dr Richard Hollis (University of California, Riverside)17/08/2012, 16:30Oral PresentationThe flexibility of RHIC to collide different nuclei provides experiments with a rich resource to systematically test models and scaling behaviors and compare the results to those from Au+Au collisions. For an initial evaluation of the Cu+Au collision system, PHENIX has earmarked several measurements for fast analysis, in particular, forward/backward and central-rapidity J/psi production. ...Go to contribution page
-
Shingo Sakai (Lawrence Berkeley National Lab. (US))17/08/2012, 16:30Oral PresentationIn heavy-ion collisions, charm and beauty (heavy flavour) quarks are produced primarily in the initial, hard partonic interactions. They successively interact with the hot and dense Quark-Gluon Plasma (QGP) expected to be formed in such collisions. Therefore, measurements of heavy flavour production provide relevant information on the properties of the QGP. This talk presents measurements by...Go to contribution page
-
Richard Lednicky (Joint Institute for Nuclear Research, Dubna, Russia)17/08/2012, 16:30Experiment upgrades, new facilities, and instrumentationOral PresentationScientific program of NICA (Nuclotron-based Ion Collider fAcility) is now under realization phase at JINR (Dubna). The main goal of the program is an experimental study of hot and dense strongly interacting matter in heavy ion collisions at nucleon-nucleon centre-of-mass energies of 4-11 GeV and at average luminosity of 10E27 cm-2s-1 for Au (79+) in the collider mode. In parallel, fixed target...Go to contribution page
-
Jeffery Mitchell (Brookhaven National Laboratory)17/08/2012, 16:30Oral PresentationMany recent lattice QCD calculations predict that there may be a first order phase transition from hadronic matter to a Quark-Gluon Plasma that ends in a critical point, with a continuous phase transition on the other side of the critical point. The Relativistic Heavy Ion Collider (RHIC) has conducted a program to probe different regions of the QCD phase diagram in the vicinity of the possible...Go to contribution page
-
Daniel McDonald (R)17/08/2012, 16:50Oral PresentationIn part to search for a possible critical point (CP) in the phase diagram of hot nuclear matter, a beam energy scan was performed at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory. The STAR experiment collected significant Au+Au data sets at beam energies, $\sqrt{\rm s_{\rm NN}}$, of 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV. Lattice and phenomenological...Go to contribution page
-
grigory ovanesyan (LANL)17/08/2012, 16:50New theoretical developmentsOral PresentationWe derive the splitting kernels for partons produced in large Q^2 scattering processes that subsequently traverse a region of strongly-interacting matter using a recently-developed effective theory Soft Collinear Effective Theory with Glauber Gluons (SCETG). We include all corrections beyond the small-x approximation, consistent with the power counting of SCETG. We demonstrate how medium...Go to contribution page
-
J.H. Lee (Brookhaven National Laboratory)17/08/2012, 16:50Experiment upgrades, new facilities, and instrumentationOral PresentationHeavy nuclei probed in deep inelastic scattering and diffraction with leptonic probes in the high-energy (small-x) regime open a new precision window into answering fundamental questions in QCD. The proposed electron-ion collider at BNL (eRHIC) will be a new high-energy and high-luminosity electron-ion/proton machine. The design offers unprecedented access to study the nature of QCD...Go to contribution page
-
Soumya Mohapatra (State University of New York (US))17/08/2012, 16:50Oral PresentationRecently harmonic flow coefficients v_1-v_6 have been measured in heavy-ion collisions at LHC. The magnitude of these coefficients and their centrality dependence suggest that they are associated with the various shape components in the initial geometry, arising from fluctuations of the participating nucleons in the overlap region. The orientation of these harmonic flow (event plane or Psi_n)...Go to contribution page
-
Mustafa Mustafa (Purdue University)17/08/2012, 16:50Heavy flavor and quarkonium productionOral PresentationHeavy quarks are produced early in the heavy-ion collisions and are expected to interact with the created strongly interacting partonic medium differently from light quarks. Therefore, they can shed new light on understanding the medium's properties. Simultaneous measurements of spectra and elliptic flow of electrons from semileptonic decays of heavy flavor hadrons at different collision...Go to contribution page
-
Ante Bilandzic (Niels Bohr Institute (DK))17/08/2012, 17:10Correlations and fluctuationsOral PresentationThe properties of the produced matter in a heavy-ion collision can be experimentally studied by measuring the azimuthal anisotropy in the momentum distribution of the produced particles. Quantified by the anisotropic flow coefficients, v_n, and corresponding symmetry planes, psi_n, such anisotropy is expected to reflect the shape of the initial energy density of the collision. We report on the...Go to contribution page
-
Adam Bzdak (Brookhaven National Laboratory)17/08/2012, 17:10Exploring the QCD phase diagramOral PresentationWe discuss the effects of the global baryon and electric charge conservation on the cumulants of net baryon and net proton fluctuations [1], which are considered to be sensitive probes of the QCD critical point. We show that the cumulants are substantially suppressed if the conservation laws are taken into account. We propose a new observable that is not influenced by the global baryon...Go to contribution page
-
Andrej El (University of Frankfurt)17/08/2012, 17:10New theoretical developmentsOral PresentationWe demonstrate that the shear viscosity of a two-component mixture of point-like partices has a non-trivial time dependence, which is induced by the intrinsic coupling between the two particle species. The shear viscosity coefficient of a mixture calculated using the Green-Kubo relation does not have this time dependence and hence is not sufficient to describe dissipatie hydrodynamic behavior...Go to contribution page
-
Dennis Perepelitsa (Columbia University)17/08/2012, 17:10Oral PresentationBottom quark is a very important probe to study the hot, dense medium produced in the heavy ion collisions. Bottom quark is produced at the relatively early stage of the nucleus-nucleus collisions and may have a small gluon radiation due to a suppression of small angle gluon radiation `dead cone effect’. Because the heavy mass of b-hadrons, muons from semi-leptonic b-hadron decays tend to have...Go to contribution page
-
Anna Stasto (Pennsylvania State University (US))17/08/2012, 17:10Experiment upgrades, new facilities, and instrumentationOral PresentationThe project of a new experimental facility at CERN, the Large Hadron-electron Collider, which will collide electrons against the LHC beams at center-of-mass energies around 1 TeV per nucleon, will be presented. After a brief introduction and showing the proposals for accelerator and detector, the physics opportunities for QCD studies will be discussed. Specifically, I will focus on the...Go to contribution page
-
Hongyan Yang (CEA - Centre d'Etudes de Saclay (FR))17/08/2012, 17:30Oral PresentationCharmonium production in heavy ion collisions has been studied at different energies and with different collision systems over the last few decades, ever since the J/psi suppression induced by color screening of its constituent quarks was proposed as a signature of the formation of a quark gluon plasma (QGP) in heavy-ion collisions. The recent measurement of the J/psi production in Pb-Pb...Go to contribution page
-
Gokce Basar (Stony Brook University)17/08/2012, 17:30Oral PresentationI study the properties of the Euclidean Dirac equation for a light fermion in the presence of both a constant abelian magnetic field and an SU(2) instanton. In particular, I analyze the zero modes analytically in various limits, both on R^4 and on the four-torus, in order to compare with recent lattice QCD results, and study the implications for the electric dipole moment of the instanton...Go to contribution page
-
Andry Malala Rakotozafindrabe (CEA - Centre d'Etudes de Saclay (FR))17/08/2012, 17:30Experiment upgrades, new facilities, and instrumentationOral PresentationWe outline the physics opportunities~\cite{Brodsky:2012vg} which are offered by a next generation and multi-purpose fixed-target experiment exploiting the LHC beams extracted by a bent crystal. This mature extraction technique offers an ideal way to obtain a clean and very collimated high-energy beam, without altering the performance of the LHC~\cite{Uggerhoj:2005xz,Scandale:2011zz,LUA9}. The...Go to contribution page
-
Dr Xiaofeng Luo (Central China Normal University)17/08/2012, 17:30Exploring the QCD phase diagramOral PresentationOne of the main goals of the RHIC Beam Energy Scan (BES) Program is to search for the QCD Critical Point and the phase boundary in the QCD phase diagram. Higher moments of event-by-event net-proton multiplicity distributions have high sensitivity to the correlation length[1], and they are directly connected to the susceptibilities in the Lattice Gauge Theory (LGT) calculations and the Hadron...Go to contribution page
-
Shengquan Tuo (Vanderbilt University (US))17/08/2012, 17:30Correlations and fluctuationsOral PresentationThe higher-order flow anisotropies of charged particles have been systematically studied by the CMS collaboration for PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV. The data were collected with the CMS detector at the LHC in 2010 and 2011. Fourier components of the anisotropic azimuthal distribution, ranging from the third to the sixth component, are obtained using...Go to contribution page
-
Pol Gossiaux (Subatech)17/08/2012, 17:50Oral PresentationRecently, we have proposed a microscopic approach for the quenching and thermalisation of heavy quarks (HQ) in URHIC \cite{Gossiaux:2008,Gossiaux:2009,Gossiaux:2010}, assuming that they interact with light partons through both elastic and radiative processes evaluated by resorting to some parameterization of the running coupling constant, while those partons are spatially distributed along...Go to contribution page
-
Xiaoming Zhang (Univ. Blaise Pascal Clermont-Fe. II (FR))17/08/2012, 17:50Oral PresentationHeavy quark production is one of the probes for investigating the properties of the high-density medium formed in heavy-ion collisions at high energy. The suppression of heavy flavour production, at high momentum, quantified via the nuclear modication factor is used to study the in-medium energy loss mechanism of heavy quarks. The measurement of the collective flow of heavy flavours provides...Go to contribution page
-
Alexander Hansen (University of Copenhagen (DK))17/08/2012, 17:50Oral PresentationThe anisotropic flow at forward rapidity provides information on the longitudinal expansion of the system produced in a heavy-ion collision. We report on the pseudo-rapidity dependence of the charged particle anisotropic flow in Pb-Pb collisions at 2.76 TeV. The measurement is done over a wide range of pseudo-rapidity, |\eta|<5.1 using the forward detectors of ALICE at the LHC. Results are...Go to contribution page
-
Anar Rustamov (Johann-Wolfgang-Goethe Univ. (DE))17/08/2012, 17:50Exploring the QCD phase diagramOral PresentationRecent results from the study of nucleus-nucleus as well as proton-proton collisions at the CERN SPS energies from experiment NA49 and its successor NA61/SHINE will be summarized. New results from a novel fluctuation analysis and from the search for the critical point of strongly interacting matter will be discussed. First measurements from NA61 of the energy dependence of...Go to contribution page
-
Jamie Nagle (University of Colorado)18/08/2012, 08:30Oral Presentation
-
Harald Appelshaeuser (Johann-Wolfgang-Goethe Univ. (DE))18/08/2012, 08:55Oral Presentation
-
Ilkka Helenius (U)18/08/2012, 09:20The knowledge of the parton distribution functions (PDFs) is essential for interpreting any hard-process results from hadronic and nuclear collisions. The nuclear modifications of PDFs have been successfully determined through a global DGLAP analysis e.g. in the sets EKS98 and more recently EPS09. So far the nuclear PDFs (nPDFs) in the global fits have been taken to be spatially independent....Go to contribution page
-
Dennis Perepelitsa (Columbia University)18/08/2012, 09:30Proton-nucleus (p+A) collisions can be used to investigate cold nuclear matter effects on hard-scattered partons and serve as an important baseline for heavy-ion collisions. In particular, p+A collisions at different centrality selections can probe the impact parameter dependence of nuclear parton distribution functions, initial state energy loss and final state parton interactions in the cold...Go to contribution page
-
Ms Yaxian Mao (Vanderbilt University (US))18/08/2012, 09:40The poster presents jet shapes, defined as the fractional transverse momentum distribution as a function of the distance r from the jet axis, where the jets are reconstructed by the anti-kT clustering algorithm. We determine the energy flow inside the jet by using particles reconstructed and calibrated using the Particle Flow algorithm. Different background subtraction methods are employed to...Go to contribution page
-
Jorge A Robles (Rutgers, State Univ. of New Jersey (US))18/08/2012, 09:50The flavor dependence of jet quenching is a powerful handle to discriminate models of parton energy loss in heavy ion collisions. While there is evidence for a strong energy loss of heavy quarks from single particle measurements, heavy flavor tagging of fully reconstructed jets has thus far not been achieved in heavy ion collisions. In this talk we demonstrate the capacity of CMS to identify...Go to contribution page
-
Marta Verweij (University of Utrecht (NL))18/08/2012, 10:00We report a measurement of transverse momentum spectra of jets detected with the ALICE detector in Pb-Pb collisions at $\sqrt{s_NN}$=2.76 TeV. Jets are reconstructed from charged particles using the anti-$k_{T}$ jet algorithm. The transverse momentum of tracks is measured down to 150 MeV/c which gives access to the low $p_{T}$ fragments of the jet. The background from soft particle production...Go to contribution page
-
Masayuki Wada (University of Texas at Austin)18/08/2012, 10:10Hadronic resonances can play a pivotal role in providing experimental evidence for partial chiral symmetry restoration in the deconfined quark-gluon phase produced in high energy nucleus-nucleus collisions. Their lifetimes, which are comparable to the lifetime of the fireball, make them a valuable tool to study medium modifications to the resonant state due to the chiral phase transition...Go to contribution page
-
Mr Yasuki Tachibana (Department of Physics, The University of Tokyo)18/08/2012, 10:20Hot and dense QCD matter, namely the quark gluon plasma, is created in high energy heavy ion collisions. High energy partons are also created through initial hard scatterings and have to traverse the QGP medium. These energetic partons are subject to lose their energy due to strong interactions with the medium. So jets in heavy ion collisions are expected to give information about the stopping...Go to contribution page
-
Todd Springer (U)18/08/2012, 10:30We investigate contributions from local hydrodynamic fluctuations to the near side ridge in the two‐particle correlation data from heavy ion collisions. We introduce a local perturbation on top of a hydrodynamic flow which respects conformal symmetry and incorporates radial flow. The subsequent evolution of the perturbation is determined by hydrodynamics; after freeze‐out, we examine the...Go to contribution page
-
Boris Hippolyte (Institut Pluridisciplinaire Hubert Curien (FR)), Dirk Rischke (University Frankfurt)18/08/2012, 11:00Oral Presentation
-
Alexander Milov (Weizmann Institute of Science (IL)), Jorge Casalderrey Solana (University of Barcelona (ES))18/08/2012, 11:30Oral Presentation
-
Charles Gale (McGill University), Lijuan Ruan18/08/2012, 12:00Oral Presentation
-
Peter Braun-Munzinger (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))18/08/2012, 12:45
Choose timezone
Your profile timezone: