Freeze-out temperature from net-kaon fluctuations at energies available at the BNL Relativistic Heavy Ion Collider

被引：36
作者：
Bellwied, R. [1 ]
Noronha-Hostler, J. [2 ]
Parotto, P. [1 ]
Vazquez, I. Portillo [1 ]
Ratti, C. [1 ]
Stafford, J. M. [1 ]
机构：
[1] Univ Houston, Dept Phys, Houston, TX 77204 USA
[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
来源：
PHYSICAL REVIEW C | 2019年 / 99卷 / 03期
基金：
美国国家科学基金会;
关键词：
COLLISIONS;
D O I：
10.1103/PhysRevC.99.034912
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We compare the mean-over-variance ratio of the net-kaon distribution calculated within the hadron resonance gas model to the latest experimental data from the Beam Energy Scan at the Relativistic Heavy Ion Collider by the STAR Collaboration. Our analysis indicates that it is not possible to reproduce the experimental results using the freeze-out parameters from the existing combined fit of net-proton and net-electric charge mean over variance. The strange mesons need about 15 MeV higher temperatures than the light hadrons at the highest collision energies. In view of the future A fluctuation measurements, we predict the A variance over mean and skewness times variance at the light and strange chemical freeze-out parameters. We observe that the A fluctuations are sensitive to the difference in the freeze-out temperatures established in this analysis. Our results have implications for other phenomenological models in the field of relativistic heavy ion collisions.
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页数：6
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