Conveners
Collective dynamics: 1
- Takeshi Kodama (Universidade Federal do Rio de Janeiro)
Collective dynamics: 2
- Laszlo Csernai (Department of Physics and Technology)
Collective dynamics: 3
- Barbara Erazmus (CNRS/IN2P3)
Collective dynamics: 4
- Guy Paic (Universidad Nacional Autonoma (MX))
-
Ramiro Rolando Debbe Velasco (Brookhaven National Laboratory (US))19/05/2014, 11:00Collective DynamicsContributed TalkProton-lead collisions at the LHC provide an opportunity to probe the physics of the initial state of ultra-relativistic heavy ion collisions. In particular, they can provide insight on the effect of an extended nuclear target on the dynamics of soft and hard scattering processes and subsequent particle production. Charged particle multiplicity and pseudorapidity distributions are...Go to contribution page
-
Michael Tannenbaum (Brookhaven National Laboratory (US))19/05/2014, 11:20Collective DynamicsContributed TalkMeasurements of the midrapidity transverse energy distribution $dE_T/d\eta$, are presented for $p$$+$$p$, $d$$+$Au, and Au$+$Au collisions at 62.4--200 GeV. The $E_T$ distributions are compared with the number of participants, $N_{\mathrm{part}}$, the number of binary collisions, $N_{\mathrm{coll}}$, and the number of constituent-quark participants, $N_{qp}$, calculated from a Glauber...Go to contribution page
-
Piotr Bozek19/05/2014, 11:40Collective DynamicsContributed TalkThe collective expansion of the fireball formed in ultrarelativistic p-A and d-A collisions are discussed. Estimates based on the extrapolation of the hydrodynamic model from A-A collisions to small systems indicate possible formation of a dense droplet of matter. Fluctuation in the initial state lead to finite eccentricity and triangularity, which give measurable elliptic and triangular flow...Go to contribution page
-
Cristian Andrei (IFIN-HH Bucharest (RO))19/05/2014, 12:00Collective DynamicsContributed TalkComprehensive results on transverse momentum distributions, their ratios, d$N$/d$y$ and <$p_{\mathrm{T}}$> values for identified light flavor hadrons ($\pi$, K, p, $\Lambda$, $\Xi$, $\Omega$) at low $p_{\mathrm{T}}$ and mid rapidity are reported for all collision systems at LHC energies: pp, p-Pb, Pb-Pb. It is well known that strong collective effects are observed in central Pb-Pb collisions...Go to contribution page
-
Sarah Campbell (Iowa State University)19/05/2014, 12:20Collective DynamicsContributed TalkIn this talk the transverse momentum spectra of identified particles, geometry categorization and bias, and global observables in d+Au collisions at 200 GeV are reported. In d+Au collisions, the intermediate $p_T$ region between 2 and 5 GeV, there is a significant enhancement of the baryon to meson ratios relative to those measured in p+p collisions. The enhancement is present in d+Au...Go to contribution page
-
Edward Shuryak (stony brook university)19/05/2014, 12:40Collective DynamicsContributed TalkWith growing multiplicity, the pp and pA collisions enter the domain where the macroscopic description (thermodynamics and hydrodynamics) becomes applicable. We discuss this situation, first with simplified thought experiments, then with some idealized representative cases, and finally address the real data. For clarity, we don't do it numerically but analytically, using the Gubser solution....Go to contribution page
-
Roy Lacey (Stony Brook University)19/05/2014, 14:20QCD Phase DiagramContributed TalkThe flow harmonics $v_{2,3}$ for charged hadrons, are studied for a broad range of centrality selections and beam collision energies in Au+Au ($\sqrt{s_{NN}}= 7.7 - 200$ GeV) and Pb+Pb ($\sqrt{s_{NN}}= 2.76$ TeV) collisions. They validate the characteristic signature expected for the system size dependence of viscous damping at each collision energy studied. The extracted viscous coefficients,...Go to contribution page
-
Alexandru Florin Dobrin (University of Utrecht (NL))19/05/2014, 14:40Collective DynamicsContributed TalkWe report the measurements of elliptic flow for identified particles produced in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV with the ALICE detector at the LHC. The second Fourier coefficient, $v_2$, measured with the scalar product method with a large pseudo-rapidity gap of $|\Delta\eta| > 2.0$, is reported for $\pi$, ${\rm K}^{\pm}$, ${\rm K}^0_s$, p ($\overline{\mathrm{p}}$),...Go to contribution page
-
Md. Rihan Haque (V)19/05/2014, 15:00Collective DynamicsContributed TalkA strongly interacting medium, namely Quark Gluon Plasma (QGP), is formed in high energy heavy ion collisions at RHIC. Elliptic flow $(v_{2})$, the second order Fourier coefficient of azimuthal distribution of the produced particles with respect to reaction plane, is used to investigate the properties of QGP. Light nuclei ($d$, $\bar{d}$, $t$, $^{\small{3}}He$), produced in such collisions,...Go to contribution page
-
Ulrich Heinz (The Ohio State University)19/05/2014, 15:20Collective DynamicsContributed TalkThe collective expansion in relativistic heavy-ion collisions is initially highly anisotropic. Due to viscosity, this leads to strongly deformed local momentum distributions which invalidates the standard viscous hydrodynamic expansion around a local equilibrium distribution, causing a breakdown of viscous fluid dynamics ร la Israel and Stewart at early times. We have developed an improved...Go to contribution page
-
Dr Gabriel Denicol (McGill University)19/05/2014, 15:40Collective DynamicsContributed TalkCurrently, most fluid-dynamical simulations of relativistic heavy ion collisions take into account only dissipative effects originating from shear viscosity. However, there is no a priori reason to neglect bulk viscosity since the actual order of magnitude and temperature dependence of this transport coefficient is unknown, and could be significant. In this work, we explore the...Go to contribution page
-
Anthony Robert Timmins (University of Houston (US))19/05/2014, 16:30Collective DynamicsContributed TalkA key question facing the heavy-ion physics community is whether or not collective behavior develops in elementary collisions. We will utilize a variety of techniques designed to obtain elliptic and triangular flow coefficients ($v_{2}$ and $v_{3}$) on data from pp $\sqrt{s} = 7$ TeV and p-Pb $\sqrt{s_{\rm NN}} = 5.02$ TeV collisions. We will report new measurements of second, fourth, and...Go to contribution page
-
Dr Gokce Basar (Stony Brook University)19/05/2014, 16:50Collective DynamicsContributed TalkI compare the flow-like correlations in high multiplicity proton-nucleus (p + A) and nucleus- nucleus (A + A) collisions. At fixed multiplicity, the correlations in these two colliding systems are strikingly similar, although though the system size in p + A is smaller. Based on an independent cluster model and a simple conformal scaling argument, where the ratio of the mean free path to the...Go to contribution page
-
Hiroshi Nakagomi (Tsukuba University)19/05/2014, 17:10Collective DynamicsContributed TalkCu$+$Au collisions at RHIC have provided the first asymmetric heavy-ion collisions at collider energies, where it is generally believed that nuclear matter above the Quark-Gluon Plasma (QGP) transition is created. The Cu$+$Au system provides a unique arena for QGP production and development with novel features that are inaccessible in symmetric A$+$A collisions, such as intrinsic...Go to contribution page
-
Florian Senzel (Goethe-Universitรคt Frankfurt)19/05/2014, 17:30Collective DynamicsContributed TalkAn updated version of the partonic transport model Boltzmann Approach to Multi-Parton Scatterings (BAMPS) is presented, which numerically solves the 3+1D Boltzmann equation by allowing interactions among all parton species: gluons, light quarks, and heavy quarks with both elastic and inelastic collisions. We introduce the improved Gunion-Bertsch matrix element, which cures problems of the...Go to contribution page
-
Paul Romatschke (U)19/05/2014, 17:50Collective DynamicsContributed TalkRecent results in d+Au and p+Pb collisions at RHIC and the LHC provide evidence for collective expansion and flow of the created medium. We propose a control set of experiments to directly compare particle emission patterns from p+Au, d+Au, and He3+Au or t+Au collisions at the same sqrt(sNN). Using Monte Carlo Glauber we find that a He3 or triton projectile, with a realistic wavefunction...Go to contribution page
-
Prof. Miklos Gyulassy (Columbia University)19/05/2014, 18:10Collective DynamicsContributed TalkRecent low pT<2 GeV vn data on the beam energy scan (BES) and D+Au at RHIC and the surprising data on low pT vn in p+Pb at LHC challenge long held assumptions about the validity or necessity of perfect fluid hydrodynamics in A+A. Could classical field interference phenomena from color antenna arrays and or Unruh noninertial color currents play a critical role in resolving the BES+DA+pA puzzle?...Go to contribution page
-
You Zhou (NIKHEF and University of Utrecht (NL))20/05/2014, 09:00Collective DynamicsContributed TalkAnisotropic azimuthal correlations are used to probe the properties and the evolution of the system created in heavy-ion collisions. Hydrodynamic model calculations predict that there are effects of $p_{\rm T}$ dependent fluctuations of the flow angle and flow magnitude, which might bias our previous anisotropic flow measurements. In this talk, the two effects will be investigated in both...Go to contribution page
-
Damir Devetak (University of Belgrade (RS))20/05/2014, 09:20Collective DynamicsContributed TalkThe technique of two-particle correlations has been widely used in studying flow via azimuthal anisotropy in relativistic heavy-ion collisions. A key assumption imposed in this approach is the factorization of Fourier coefficients extracted from two-particle correlations into a product of single-particle anisotropies of trigger and associated particles. It was recently predicted by...Go to contribution page
-
Soumya Mohapatra (State University of New York (US))20/05/2014, 09:40Collective DynamicsContributed TalkMeasurements of the distributions of event-by-event flow harmonics $v_n$ and the correlations between harmonics $v_n$ and $v_m$ of different orders in $\sqrt{s_{NN}}=2.76$ TeV Pb+Pb collisions are presented. These measurements give insight into the nature of fluctuations in the initial geometry and the role of linear and non-linear hydrodynamic response to the fluctuations, the latter can...Go to contribution page
-
Stefan Floerchinger (CERN)20/05/2014, 10:00Collective DynamicsContributed TalkInitial fluctuations in hydrodynamic fields such as energy density or flow velocity give access to understanding initial state and equilibration physics as well as thermodynamic and transport properties. We provide evidence that the fluid dynamic propagation of fluctuations of realistic size can be based on a background-fluctuation splitting and a systematic perturbative expansion in the...Go to contribution page
-
Ms Valentina Rolando (Universitร di Ferrara, INFN Ferrara)20/05/2014, 10:20Collective DynamicsContributed TalkWe present a numerical code for modeling relativistic heavy ion collisions, ECHO-QGP. The code includes relativistic hydrodynamics with dissipative terms and implements Israel-Stewart theory in 3+1 D. Initial conditions are provided through an implementation of the Glauber model (both Optical and Monte Carlo), while freezeout and particle generation is based on the Cooper-Frye...Go to contribution page