# K* production in Heavy Ion Collisions at RHIC - Nuclear Experiment

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Abstract: Study of resonances with their short life-times provides useful tools toprobe the properties of hot and dense matter produced in relativistic heavy ioncollisions. The high density and-or high temperature of the medium can modifyresonance properties such as mass and width. Therefore, measurement of theseproperties can reveal important information about the evolution dynamics inheavy ion collisions. We report the measurements of $K^{*}$ transversemomentum$p T$ spectra at mid-rapidity via its hadronic decay channel up tointermediate $p {T}$ of 2.9 GeV-c using the STAR detector in Au+Au and Cu+Cucollisions at $\sqrt{s {\mathrm{NN}}}$= 62.4 GeV and 200 GeV. These results arecompared to previously reported $K^{*}$ results from Au+Au collisions at RHIC.Integrated yield ratios of $K^{*}-K$ and $K^{*}-\phi$ are used to understandthe rescattering and regeneration effects on $K^{*}$ production.

Autor: Sadhana Dash, for the STAR Collaboration

Fuente: https://arxiv.org/