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 ($dN/d\eta (\eta =0)$). The obtained function is in very good agreement with recent experimental data.

中文翻译：

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了解ķ ^⁎ / ķ比在重离子碰撞

我们研究 ${ķ}^{⁎}$强子气相中重离子碰撞中的介子解离。我们使用生产和吸收的横截面${ķ}^{⁎}$和强子气体中的K介子，它们是在先前的工作中计算得出的。我们计算时间的演变${ķ}^{⁎}$ 丰度和 ${ķ}^{⁎}/ķ$强子气相的比率。假设采用Bjorken型冷却，并利用冻结温度和中心多重密度之间的经验关系，我们可以写出${ķ}^{⁎}/ķ$ 根据（$dñ/d\eta （\eta =0）$）。所获得的功能与最近的实验数据非常吻合。