Centrality dependence of chemical freeze-out parameters from net-proton and net-charge fluctuations using a hadron resonance gas model

Centrality dependence of chemical freeze-out parameters from net-proton and net-charge... We estimate chemical freeze-out parameters in Hadron Resonance Gas (HRG) and Excluded Volume HRG (EVHRG) models by fitting the experimental information of net-proton and net-charge fluctuations measured in Au + Au collisions by the STAR Collaboration at the BNL Relativistic Heavy Ion Collider (RHIC). We observe that chemical freeze-out parameters obtained from lower and higher order fluctuations are almost the same for sNN>27 GeV, but tend to deviate from each other at lower sNN. Moreover, these separations increase with decrease of sNN, and for a fixed sNN increase towards central collisions. Furthermore, we observe an approximate scaling behavior of (μB/T)/(μB/T)central with (Npart)/(Npart)central for the parameters estimated from lower order fluctuations for 11.5≤sNN≤200 GeV. Scaling is violated for the parameters estimated from higher order fluctuations for sNN=11.5 and 19.6 GeV. It is observed that the chemical freeze-out parameter, which can describe σ2/M of net protons very well in all energies and centralities, cannot describe the sσ equally well, and vice versa. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Centrality dependence of chemical freeze-out parameters from net-proton and net-charge fluctuations using a hadron resonance gas model

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Centrality dependence of chemical freeze-out parameters from net-proton and net-charge fluctuations using a hadron resonance gas model

Abstract

We estimate chemical freeze-out parameters in Hadron Resonance Gas (HRG) and Excluded Volume HRG (EVHRG) models by fitting the experimental information of net-proton and net-charge fluctuations measured in Au + Au collisions by the STAR Collaboration at the BNL Relativistic Heavy Ion Collider (RHIC). We observe that chemical freeze-out parameters obtained from lower and higher order fluctuations are almost the same for sNN>27 GeV, but tend to deviate from each other at lower sNN. Moreover, these separations increase with decrease of sNN, and for a fixed sNN increase towards central collisions. Furthermore, we observe an approximate scaling behavior of (μB/T)/(μB/T)central with (Npart)/(Npart)central for the parameters estimated from lower order fluctuations for 11.5≤sNN≤200 GeV. Scaling is violated for the parameters estimated from higher order fluctuations for sNN=11.5 and 19.6 GeV. It is observed that the chemical freeze-out parameter, which can describe σ2/M of net protons very well in all energies and centralities, cannot describe the sσ equally well, and vice versa.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.014902
Publisher site
See Article on Publisher Site

Abstract

We estimate chemical freeze-out parameters in Hadron Resonance Gas (HRG) and Excluded Volume HRG (EVHRG) models by fitting the experimental information of net-proton and net-charge fluctuations measured in Au + Au collisions by the STAR Collaboration at the BNL Relativistic Heavy Ion Collider (RHIC). We observe that chemical freeze-out parameters obtained from lower and higher order fluctuations are almost the same for sNN>27 GeV, but tend to deviate from each other at lower sNN. Moreover, these separations increase with decrease of sNN, and for a fixed sNN increase towards central collisions. Furthermore, we observe an approximate scaling behavior of (μB/T)/(μB/T)central with (Npart)/(Npart)central for the parameters estimated from lower order fluctuations for 11.5≤sNN≤200 GeV. Scaling is violated for the parameters estimated from higher order fluctuations for sNN=11.5 and 19.6 GeV. It is observed that the chemical freeze-out parameter, which can describe σ2/M of net protons very well in all energies and centralities, cannot describe the sσ equally well, and vice versa.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 6, 2017

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