Initial eccentricity and constituent quark number scaling of elliptic flow in ideal and viscous dynamics
Abstract
In the IsraelStewart theory of dissipative hydrodynamics, the scaling properties of elliptic flow in Au+Au collisions are studied. The initial energy density of the fluid was fixed to reproduce STAR data on phimeson multiplicity in 05% Au+Au collisions such that, irrespective of fluid viscosity, entropy at the freezeout is similar in ideal or in viscous evolution. The initial eccentricity or constituent quark number scaling is only approximate in ideal or minimally viscous (eta/s=1/4pi) fluid. Eccentricity scaling becomes nearly exact in more viscous fluid (eta/s>=0.12). However, in more viscous fluid, constituent quark number scaled elliptic flow for mesons and baryons splits into separate scaling functions. Simulated flows also do not exhibit 'universal scaling'; that is, elliptic flow scaled by the constituent quark number and charged particles v{sub 2} is not a single function of transverse kinetic energy scaled by the quark number. From a study of the violation of universal scaling, we obtain an estimate of quarkgluon plasma viscosity, eta/s=0.12+0.03. The error is statistical only. The systematic error in eta/s could be as large.
 Authors:

 Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064 (India)
 Publication Date:
 OSTI Identifier:
 21388956
 Resource Type:
 Journal Article
 Journal Name:
 Physical Review. C, Nuclear Physics
 Additional Journal Information:
 Journal Volume: 81; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.81.044905; (c) 2010 The American Physical Society; Journal ID: ISSN 05562813
 Country of Publication:
 United States
 Language:
 English
 Subject:
 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; APPROXIMATIONS; BARYONS; CHARGED PARTICLES; COLLISIONS; ENERGY DENSITY; ENTROPY; FLUIDS; FREEZING OUT; HYDRODYNAMICS; KINETIC ENERGY; MULTIPLICITY; PHI MESONS; QUARK MATTER; QUARKS; SCALING; SIMULATION; VISCOSITY; BOSONS; CALCULATION METHODS; ELEMENTARY PARTICLES; ENERGY; FERMIONS; FLUID MECHANICS; HADRONS; MATTER; MECHANICS; MESONS; PHYSICAL PROPERTIES; SEPARATION PROCESSES; THERMODYNAMIC PROPERTIES
Citation Formats
Chaudhuri, A K. Initial eccentricity and constituent quark number scaling of elliptic flow in ideal and viscous dynamics. United States: N. p., 2010.
Web. doi:10.1103/PHYSREVC.81.044905.
Chaudhuri, A K. Initial eccentricity and constituent quark number scaling of elliptic flow in ideal and viscous dynamics. United States. doi:10.1103/PHYSREVC.81.044905.
Chaudhuri, A K. Thu .
"Initial eccentricity and constituent quark number scaling of elliptic flow in ideal and viscous dynamics". United States. doi:10.1103/PHYSREVC.81.044905.
@article{osti_21388956,
title = {Initial eccentricity and constituent quark number scaling of elliptic flow in ideal and viscous dynamics},
author = {Chaudhuri, A K},
abstractNote = {In the IsraelStewart theory of dissipative hydrodynamics, the scaling properties of elliptic flow in Au+Au collisions are studied. The initial energy density of the fluid was fixed to reproduce STAR data on phimeson multiplicity in 05% Au+Au collisions such that, irrespective of fluid viscosity, entropy at the freezeout is similar in ideal or in viscous evolution. The initial eccentricity or constituent quark number scaling is only approximate in ideal or minimally viscous (eta/s=1/4pi) fluid. Eccentricity scaling becomes nearly exact in more viscous fluid (eta/s>=0.12). However, in more viscous fluid, constituent quark number scaled elliptic flow for mesons and baryons splits into separate scaling functions. Simulated flows also do not exhibit 'universal scaling'; that is, elliptic flow scaled by the constituent quark number and charged particles v{sub 2} is not a single function of transverse kinetic energy scaled by the quark number. From a study of the violation of universal scaling, we obtain an estimate of quarkgluon plasma viscosity, eta/s=0.12+0.03. The error is statistical only. The systematic error in eta/s could be as large.},
doi = {10.1103/PHYSREVC.81.044905},
journal = {Physical Review. C, Nuclear Physics},
issn = {05562813},
number = 4,
volume = 81,
place = {United States},
year = {2010},
month = {4}
}