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Title: Chemical freeze-out in relativistic heavy-ion collisions

One surprising result in relativistic heavy-ion collisions is that the abundance of various particles measured in experiments is consistent with the picture that they reach chemical equilibrium at a temperature much higher than the temperature they freeze out kinetically. Using a multiphase transport model to study particle production in these collisions, we find, as an example, that the effective pion to nucleon ratio, which includes those from resonance decays, indeed changes very little during the evolution of the hadronic matter from the chemical to the kinetic freeze-out, and it is also accompanied by an almost constant specific entropy. Finally, we further use a hadron resonance gas model to illustrate the results from the transport model study.
Authors:
ORCiD logo [1] ;  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Shanghai Inst. of Applied Physics
  2. Texas A&M Univ., College Station, TX (United States). Cyclotron Inst. and Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
SC0015266; 2015CB856904; 2014CB845401; 11475243; 11421505; Y290061011; Y526011011; 15DZ2272100; 13PJ1410600; A-1358
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 772; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Texas A&M Univ., College Station, TX (United States)
Sponsoring Org:
USDOE; Welch Foundation; National Natural Science Foundation of China (NNSFC); Chinese Academy of Sciences (CAS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1425948

Xu, Jun, and Ko, Che Ming. Chemical freeze-out in relativistic heavy-ion collisions. United States: N. p., Web. doi:10.1016/j.physletb.2017.06.061.
Xu, Jun, & Ko, Che Ming. Chemical freeze-out in relativistic heavy-ion collisions. United States. doi:10.1016/j.physletb.2017.06.061.
Xu, Jun, and Ko, Che Ming. 2017. "Chemical freeze-out in relativistic heavy-ion collisions". United States. doi:10.1016/j.physletb.2017.06.061. https://www.osti.gov/servlets/purl/1425948.
@article{osti_1425948,
title = {Chemical freeze-out in relativistic heavy-ion collisions},
author = {Xu, Jun and Ko, Che Ming},
abstractNote = {One surprising result in relativistic heavy-ion collisions is that the abundance of various particles measured in experiments is consistent with the picture that they reach chemical equilibrium at a temperature much higher than the temperature they freeze out kinetically. Using a multiphase transport model to study particle production in these collisions, we find, as an example, that the effective pion to nucleon ratio, which includes those from resonance decays, indeed changes very little during the evolution of the hadronic matter from the chemical to the kinetic freeze-out, and it is also accompanied by an almost constant specific entropy. Finally, we further use a hadron resonance gas model to illustrate the results from the transport model study.},
doi = {10.1016/j.physletb.2017.06.061},
journal = {Physics Letters. Section B},
number = C,
volume = 772,
place = {United States},
year = {2017},
month = {6}
}