Understanding the $K^{\ast }/K$ ratio in heavy ion collisions

Abstract

We study the $K^{\ast }$ meson dissociation in heavy ion collisions during the hadron gas phase. We use the production and absorption cross sections of the $K^{\ast }$ and $K$ mesons in a hadron gas, which were calculated in a previous work. We compute the time evolution of the $K^{\ast }$ abundance and the $K^{\ast }/K$ 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 $K^{\ast }/K$ as a function of ($dN/d\eta (\eta =0)$). The obtained function is in very good agreement with recent experimental data.

arXiv comment9 pages, 5 figures

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• Interaction of exotic states in a hadronic medium: the $Z_c(3900)$ case
• Probing Late-Stage Hadronic Interactions at High Baryon Density via $K^{\ast 0}$ Production in the RHIC Beam Energy Scan Program
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