高能核-核碰撞中类Tsallis参数的激发函数

Excitation Functions of Tsallis-Like Parameters in High-Energy Nucleus-Nucleus Collisions.

作者信息

Li Li-Li, Liu Fu-Hu, Olimov Khusniddin K

机构信息

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China.

Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.

出版信息

Entropy (Basel). 2021 Apr 18;23(4):478. doi: 10.3390/e23040478.

DOI:10.3390/e23040478

PMID:33919482

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8073252/

Abstract

The transverse momentum spectra of charged pions, kaons, and protons produced at mid-rapidity in central nucleus-nucleus (AA) collisions at high energies are analyzed by considering particles to be created from two participant partons, which are assumed to be contributors from the collision system. Each participant (contributor) parton is assumed to contribute to the transverse momentum by a Tsallis-like function. The contributions of the two participant partons are regarded as the two components of transverse momentum of the identified particle. The experimental data measured in high-energy AA collisions by international collaborations are studied. The excitation functions of kinetic freeze-out temperature and transverse flow velocity are extracted. The two parameters increase quickly from ≈3 to ≈10 GeV (exactly from 2.7 to 7.7 GeV) and then slowly at above 10 GeV with the increase of collision energy. In particular, there is a plateau from near 10 GeV to 200 GeV in the excitation function of kinetic freeze-out temperature.

摘要

通过将粒子视为由两个参与部分子产生（这两个参与部分子被假定为碰撞系统的贡献者），对高能中心核-核（AA）碰撞中在中快度产生的带电π介子、K介子和质子的横向动量谱进行了分析。假定每个参与（贡献）部分子通过类似Tsallis函数对横向动量做出贡献。两个参与部分子的贡献被视为所识别粒子横向动量的两个分量。研究了国际合作组在高能AA碰撞中测量的实验数据。提取了动力学冻结温度和横向流速的激发函数。随着碰撞能量的增加，这两个参数从≈3 GeV迅速增加到≈10 GeV（准确地说是从2.7 GeV到7.7 GeV），然后在10 GeV以上缓慢增加。特别是，动力学冻结温度的激发函数在从近10 GeV到200 GeV之间存在一个平台期。