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Quark flavor equilibration of the quark-gluon plasma

Journal Article · · Physical Review. C
DOI:https://doi.org/10.1103/w7tz-mlh7· OSTI ID:3023165
 [1];  [1];  [1];  [2]
  1. Duke Univ., Durham, NC (United States)
  2. Vanderbilt Univ., Nashville, TN (United States)
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The early stage of a heavy-ion collision is marked by rapid entropy production and the transition from a gluon saturated initial condition to a plasma of quarks and gluons that evolves hydrodynamically. However, during the early times of the hydrodynamic evolution, the chemical composition of the QCD medium is still largely unknown. We present a study of quark chemical equilibration in the (Q)GP using a novel model of viscous hydrodynamic evolution in partial chemical equilibrium. Motivated by the success of gluon saturated initial condition models, we initialize the QCD medium as a completely gluon dominated state. Local quark production during the hydrodynamic phase is then simulated through the evolution of time-dependent fugacities for each independent quark flavor, with the timescales set as free parameters to compare different rates of equilibration. We present the results of complete heavy-ion collision simulations using this partial chemical equilibrium model, and show the effects on hadronic and electromagnetic observables. In particular, we show that the development of flow is sensitive to the equilibration timescale, providing an empirical way to probe the chemical equilibration of the QCD medium.
Research Organization:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; FG02-05ER41367; SC0024347
Other Award/Contract Number:
NP-ERCAP0026721
OSTI ID:
3023165
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 113; ISSN 2469-9985; ISSN 2469-9993
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Charged-particle multiplicity
Collective flow
Hydrodynamic models
Monte Carlo methods
Photon
lepton & quark production
Quark-gluon plasma
Relativistic heavy-ion collisions