200 GeV的Au+Au碰撞中粲奇异介子的动力学冻结性质

白慧, 李保春

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山西大学学报(自然科学版) ›› 2025, Vol. 48 ›› Issue (3) : 550-557. DOI: 10.13451/j.sxu.ns.2023147
物理

200 GeV的Au+Au碰撞中粲奇异介子的动力学冻结性质

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Kinetic Freeze-out Properties of Charm-strange Mesons in Au+Au Collisions at 200 GeV

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摘要

本文对200 GeV的Au +Au碰撞中粲奇异介子DS ±的横动量谱进行了模型研究。利用非广延Tsallis统计模型、冲击波模型和Tsallis冲击波模型分析了不同碰撞中心度的粒子分布，并与实验结果进行了比较和讨论，给出和解释了模型各自适用的横动量范围以及其中的动力学冻结参数。非广延参数q和动力学冻结温度随中心度百分比的升高而升高，平均径向流随中心度百分比的升高而降低。与边缘碰撞相比，中心碰撞的热化火球寿命较长，具有更长的演化时间。DS ±的动力学冻结时间早于轻强子，具有较小的径向流速，和较高动力学冻结温度。由于质量较大，产生于碰撞更早期，携带着夸克胶子等离子体（Quark-Gluon Plasma， QGP）的相关信息。这些冻结性质有助于加深我们对高能核碰撞中反应体系演化的理解。

Abstract

The transverse momentum spectra of charm-strange meson DS ± by model research in Au + Au collisions at 200 GeV is studied. The non-extensive Tsallis statistic model, Blast-wave model and Tsallis Blast-wave model are applied to analyze the particle distributions in various centrality bins. They are compared with the STAR experiment results. The appropriate range of the transverse momentum and the kinetic freeze-out parameters in each model are studied. The non-extensive parameter q and the kinetic freeze-out temperature rise with the centrality percentage. The mean radial flow decreases with the centrality percentage. Fireballs produced in central collisions survive longer and have a longer evolution time than those produced in peripheral collisions. Compared with the light hadrons, DS ± freeze out earlier and has smaller radial velocity and higher kinetic freeze-out temperature. Particles are created in earlier stage due to the larger mass and carry the information of Quark-Gluon Plasma （QGP). These freeze-out properties can help us to better understand the evolution of the matter in high-energy nucleus collisions.

关键词

高能核-核碰撞 / Tsallis冲击波模型 / DS ±粒子谱 / 动力学冻结

Key words

nucleus-nucleus collision at high energies / Tsallis Blast-wave model / DS ± spectra / kinetic freeze-out

中图分类号

O572.2

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白慧 , 李保春. 200 GeV的Au+Au碰撞中粲奇异介子的动力学冻结性质. 山西大学学报(自然科学版). 2025, 48(3): 550-557 https://doi.org/10.13451/j.sxu.ns.2023147
BAI Hui, LI Baochun. Kinetic Freeze-out Properties of Charm-strange Mesons in Au+Au Collisions at 200 GeV[J]. Journal of Shanxi University(Natural Science Edition). 2025, 48(3): 550-557 https://doi.org/10.13451/j.sxu.ns.2023147

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基金

国家自然科学基金(11575103)
山西省自然科学基金(202103021224036)

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