Sangyong Jeon

Event-by-event anisotropic flow in heavy-ion collisions from combined Yang-Mills and viscous fluid dynamics

Anisotropic flow coefficients v(1)-v(5) in heavy ion collisions are computed by combining a classical Yang-Mills description of the early time Glasma flow with the subsequent relativistic viscous hydrodynamic evolution of matter through the quark-gluon plasma and hadron gas phases. The Glasma dynamics, as realized in the impact parameter dependent Glasma (IP-Glasma) model, takes into account event-by-event geometric fluctuations in nucleon positions and intrinsic subnucleon scale color charge fluctuations; the preequilibrium flow of matter is then matched to the music algorithm describing viscous hydrodynamic flow and particle production at freeze-out. The IP-Glasma+MUSIC model describes well both transverse momentum dependent and integrated v(n) data measured at the Large Hadron Collider and the Relativistic Heavy Ion Collider. The model also reproduces the event-by-event distributions of v(2), v(3) and v(4) measured by the ATLAS Collaboration. The implications of our results for better understanding of the dynamics of the Glasma and for the extraction of transport properties of the quark-gluon plasma are outlined.

Elliptic and triangular flow in event-by-event D=3+1 viscous hydrodynamics.

We present results for the elliptic and triangular flow coefficients v(2) and v(3) in Au+Au collisions at √s=200  AGeV using event-by-event D=3+1 viscous hydrodynamic simulations. We study the effect of initial state fluctuations and finite viscosities on the flow coefficients v(2) and v(3) as functions of transverse momentum and pseudorapidity. Fluctuations are essential to reproduce the measured centrality dependence of elliptic flow. We argue that simultaneous measurements of v(2) and v(3) can determine η/s more precisely.

Hydrodynamic Modeling of Heavy-Ion Collisions

We review progress in the hydrodynamic description of heavy-ion collisions, focusing on recent developments in modeling the fluctuating initial state and event-by-event viscous hydrodynamic simulations. We discuss how hydrodynamics can be used to extract information on fundamental properties of quantum chromodynamics from experimental data, and review successes and challenges of the hydrodynamic framework.

Charged Particle Ratio Fluctuation as a Signal for Quark-Gluon Plasma

In this letter we argue that the event-by-event fluctuations of the ratio of the positively charged and the negatively charged pions provides a signal of quark-gluon plasma. The fact that quarks carry fractional charges is ultimately responsible for this distinct signal.

Extracting the jet transport coefficient from jet quenching in high-energy heavy-ion collisions

Karen M. Burke, Alessandro Buzzatti, 3 Ningbo Chang, 5 Charles Gale, Miklos Gyulassy, Ulrich Heinz, Sangyong Jeon, Abhijit Majumder, Berndt Müller, Guang-You Qin, 1 Björn Schenke, Chun Shen, Xin-Nian Wang, 2 Jiechen Xu, Clint Young, and Hanzhong Zhang Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA Nuclear Science Division, MS 70R0319, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Physics, Columbia University, New York 10027, USA School of Physics, Shandong University, Jinan, Shandong 250100, China Institute of Particle Physics and Key Laboratory of Quarks and Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8, Canada Department of Physics, The Ohio State University, Ohio 43210, USA Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

Importance of the Bulk Viscosity of QCD in Ultrarelativistic Heavy-Ion Collisions

We investigate the consequences of a nonzero bulk viscosity coefficient on the transverse momentum spectra, azimuthal momentum anisotropy, and multiplicity of charged hadrons produced in heavy ion collisions at LHC energies. The agreement between a realistic 3D hybrid simulation and the experimentally measured data considerably improves with the addition of a bulk viscosity coefficient for strongly interacting matter. This paves the way for an eventual quantitative determination of several QCD transport coefficients from the experimental heavy ion and hadron-nucleus collision programs.

(3+1)D hydrodynamic simulation of relativistic heavy-ion collisions

We present music, an implementation of the Kurganov-Tadmor algorithm for relativistic 3+1 dimensional fluid dynamics in heavy-ion collision scenarios. This Riemann-solver-free, second-order, high-resolution scheme is characterized by a very small numerical viscosity and its ability to treat shocks and discontinuities very well. We also incorporate a sophisticated algorithm for the determination of the freeze-out surface using a three dimensional triangulation of the hypersurface. Implementing a recent lattice based equation of state, we compute

Energy loss of leading partons in a thermal QCD medium

{p}_{T}

Energy loss of leading hadrons and direct photon production in evolving quark-gluon plasma

-spectra and pseudorapidity distributions for Au+Au collisions at

MARTINI: An event generator for relativistic heavy-ion collisions

\sqrt{s}=200 \mathrm{GeV}