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Title: Viscosities of the Baryon-Rich Quark-Gluon Plasma from Beam Energy Scan Data

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Wayne State Univ., Detroit, MI (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). RIKEN Research Center
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  3. Wayne State Univ., Detroit, MI (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)

Here, this work presents the first Bayesian inference study of the (3 + 1)D dynamics of relativistic heavy-ion collisions and quark-gluon plasma viscosities using an event-by-event (3 + 1)D hydrodynamics + hadronic transport theoretical framework and data from the Relativistic Heavy Ion Collider Beam energy scan program. Robust constraints on initial state nuclear stopping and the baryon chemical potential-dependent shear viscosity of the produced quantum chromodynamic (QCD) matter are obtained. The specific bulk viscosity of the QCD matter is found to exhibit a preferred maximum around $$\sqrt{s_{NN}}$$ = 19.6 GeV . This result allows for the alternative interpretation of a reduction (and/or increase) of the speed of sound relative to that of the employed lattice-QCD based equation of state for net baryon chemical potential μB ~0.2(0.4) GeV .

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Wayne State Univ., Detroit, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0012704; SC0021969; AC02-05CH11231
OSTI ID:
2310279
Alternate ID(s):
OSTI ID: 2341422; OSTI ID: 2474197
Report Number(s):
BNL-225270-2024-JAAM; TRN: US2409080
Journal Information:
Physical Review Letters, Vol. 132, Issue 7; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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