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Title: Proton number cumulants and correlation functions in Au-Au collisions at s N N = 7.7 –200 GeV from hydrodynamics

Abstract

We present a dynamical description of (anti)proton number cumulants and correlation functions in central Au-Au collisions at √sNN=7.7–200 GeV by utilizing viscous hydrodynamics simulations. The cumulants of proton and baryon number are calculated in a given momentum acceptance analytically, via an appropriately extended Cooper-Frye procedure describing particlization of an interacting hadron resonance gas. The effects of global baryon number conservation are taken into account using a generalized subensemble acceptance method. The experimental data of the STAR Collaboration are consistent at √sNN ≳ 20 GeV with simultaneous effects of global baryon number conservation and repulsive interactions in the baryon sector, the latter being in line with the behavior of baryon number susceptibilities observed in lattice QCD. The data at lower collision energies show possible indications for sizable attractive interactions among baryons. The data also indicate sizable negative two-particle correlations between antiprotons that are not satisfactorily described by baryon conservation and excluded volume effects. We also discuss differences between cumulants and correlation functions (factorial cumulants) of (anti)proton number distribution, proton versus baryon number fluctuations, and effects of the hadronic afterburner.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Wayne State Univ., Detroit, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); Alexander von Humboldt Foundation; National Science Foundation (NSF)
OSTI Identifier:
1838381
Alternate Identifier(s):
OSTI ID: 1856509; OSTI ID: 1903206
Grant/Contract Number:  
AC02-05CH11231231; SC001346; AC02-05CH11231; PHY-2012922; SC0013460
Resource Type:
Published Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Name: Physical Review C Journal Volume: 105 Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Vovchenko, Volodymyr, Koch, Volker, and Shen, Chun. Proton number cumulants and correlation functions in Au-Au collisions at s N N = 7.7 –200 GeV from hydrodynamics. United States: N. p., 2022. Web. doi:10.1103/PhysRevC.105.014904.
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Vovchenko, Volodymyr, Koch, Volker, & Shen, Chun. Proton number cumulants and correlation functions in Au-Au collisions at s N N = 7.7 –200 GeV from hydrodynamics. United States. https://doi.org/10.1103/PhysRevC.105.014904
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Vovchenko, Volodymyr, Koch, Volker, and Shen, Chun. Wed . "Proton number cumulants and correlation functions in Au-Au collisions at s N N = 7.7 –200 GeV from hydrodynamics". United States. https://doi.org/10.1103/PhysRevC.105.014904.
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@article{osti_1838381,
title = {Proton number cumulants and correlation functions in Au-Au collisions at s N N = 7.7 –200 GeV from hydrodynamics},
author = {Vovchenko, Volodymyr and Koch, Volker and Shen, Chun},
abstractNote = {We present a dynamical description of (anti)proton number cumulants and correlation functions in central Au-Au collisions at √sNN=7.7–200 GeV by utilizing viscous hydrodynamics simulations. The cumulants of proton and baryon number are calculated in a given momentum acceptance analytically, via an appropriately extended Cooper-Frye procedure describing particlization of an interacting hadron resonance gas. The effects of global baryon number conservation are taken into account using a generalized subensemble acceptance method. The experimental data of the STAR Collaboration are consistent at √sNN ≳ 20 GeV with simultaneous effects of global baryon number conservation and repulsive interactions in the baryon sector, the latter being in line with the behavior of baryon number susceptibilities observed in lattice QCD. The data at lower collision energies show possible indications for sizable attractive interactions among baryons. The data also indicate sizable negative two-particle correlations between antiprotons that are not satisfactorily described by baryon conservation and excluded volume effects. We also discuss differences between cumulants and correlation functions (factorial cumulants) of (anti)proton number distribution, proton versus baryon number fluctuations, and effects of the hadronic afterburner.},
doi = {10.1103/PhysRevC.105.014904},
journal = {Physical Review C},
number = 1,
volume = 105,
place = {United States},
year = {Wed Jan 05 00:00:00 EST 2022},
month = {Wed Jan 05 00:00:00 EST 2022}
}
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https://doi.org/10.1103/PhysRevC.105.014904
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