Measurements of $p$-$\Xi$, $\Lambda$-$\Lambda$, and $\Xi$-$\Xi$ Correlation in Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 200 GeV at RHIC-STAR

TL;DR

This paper reports the first measurements of p-$ ext{Xi}$ and $ ext{Xi}$-$ ext{Xi}$ correlations in Au+Au collisions at 200 GeV, revealing strong attractive and anti-correlation behaviors relevant for hyperon interactions.

Contribution

It presents the first experimental measurements of p-$ ext{Xi}$ and $ ext{Xi}$-$ ext{Xi}$ correlations in heavy-ion collisions, providing new insights into hyperon interactions.

Findings

p-$ ext{Xi}$ correlation shows strong attraction

$ ext{Xi}$-$ ext{Xi}$ correlation is anti-correlated

$ ext{Lambda}$-$ ext{Lambda}$ correlation shows anti-correlation

Abstract

The hyperon-hyperon and hyperon-nucleon interactions are important in search for exotic hadrons such dibaryon as a bound state of two baryons. $\Lambda$-$\Lambda$ correlation has been measured in Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 200 GeV at RHIC-STAR experiment using high statistics data recently taken, which has been found to clearly show the anti-correlation. The first measurements of p-$\Xi$ and $\Xi$-$\Xi$ correlations in Au+Au collisions have been shown. The p-$\Xi$ correlation function shows the strong attractive interaction, which is consistent with HAL QCD calculation. $\Xi$-$\Xi$ correlation has also been measured to be negative (as anti-correlation).