$K^{*0}$ and $\Sigma^*$ production in Au+Au collisions at $\sqrt{s_{NN}}=$ 200 GeV and 62.4 GeV

TL;DR

This study models $K^{*0}$ and $\Sigma^*$ resonance production in Au+Au collisions at 200 and 62.4 GeV, combining quark combination and transport models to match experimental data and estimate hadronic rescattering durations.

Contribution

It introduces a combined quark combination and transport model approach to accurately describe resonance production and rescattering effects in heavy-ion collisions.

Findings

$K^{*0}$ suppression indicates a rescattering stage of about 13 fm/c at 200 GeV.

$\Sigma^*$ spectra are well described with minimal rescattering effects.

Predictions made for $\Sigma^*$ elliptic flow and spectra at 62.4 GeV.

Abstract

Applying a quark combination model for the hadronization of Quark Gluon Plasma (QGP) and A Relativistic Transport (ART) model for the subsequent hadronic rescattering process, we investigate the production of $K^{*0}$ and $\Sigma^*$ resonances in central Au+Au collisions at $\sqrt{s_{NN}}=$ 200 GeV and 62.4 GeV. The initial $K^{*0}$ produced via hadronization is higher than the experimental data in the low $p_T$ region and is close to the data at 2-3 GeV/c. We take into account the hadronic rescattering effects which lead to a strong suppression of $K^{*0}$ with low $p_T$, and find that the $p_T$ spectrum of $K^{*0}$ can be well described. According to the suppressed magnitude of $K^{*0}$ yield, the time span of hadronic rescattering stage is estimated to be about 13 fm/c at 200 GeV and 5 fm/c at 62.4 GeV. The $p_T$ spectrum of $\Sigma^*$ directly obtained by quark combination hadronization in central Au+Au collisions at 200 GeV is in well agreement with the experimental data, which shows a weak hadronic rescattering effects. The elliptic flow v2 of $\Sigma^*$ in minimum bias Au+Au collisions at 200 GeV and $p_T$ spectrum of $\Sigma^*$ at lower 62.4 GeV are predicted.