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arXiv 2101.07302hep-ph
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对重离子碰撞中$K^*/K$比的理解

Understanding the $K^*/K$ ratio in heavy ion collisions

C. Le Roux, F. S. Navarra, L. M. Abreu

摘要:

本文研究了强子气相重离子碰撞中$K^*$介子的离解。我们使用的生产和吸收截面的$K^*$和$K$介子在强子气体,这是在以前的工作中计算。计算了强子气相中$K^*$丰度和$K^* /K$比随时间的演化。假设Bjorken型冷却,并使用冻结温度和中心多重数密度之间的经验关系,我们能够将$K^* /K$写成($ dN /d η(η=0)$)的函数。得到的函数与最近的实验数据非常吻合。

英文摘要:

We study the $K^*$ meson dissociation in heavy ion collisions during the hadron gas phase. We use the production and absorption cross sections of the $K^*$ and $K$ mesons in a hadron gas, which were calculated in a previous work. We compute the time evolution of the $K^*$ abundance and the $K^* /K$ ratio during the hadron gas phase. Assuming a Bjorken type cooling and using an empirical relation between the freeze-out temperature and the central multiplicity density, we are able to write $K^* /K$ as a function of ($ dN /d η(η=0)$). The obtained function is in very good agreement with recent experimental data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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