Femtoscopy of Strange Baryons in Heavy-ion Collisions at RHIC-STAR

Abstract

Studying the final state interactions and finding possible bound states is helpful for understanding the strong interactions and comprehending the equation-of-state (EoS) of the nuclear matter. In these proceedings, we present recent femtoscopy results of \pXi{}, \LaLa{}, \pOm{} femtoscopic correlations with high statistics Isobar (Ru+Ru, Zr+Zr) and Au+Au collisions measured by the STAR experiment. For the \pXi{} and \pOm{} pairs, the centrality dependence of source size and the scattering parameters are extracted with the Lednický-Lyuboshitz approach. The results show that there is an attractive interaction in \pXi{} pairs and a bound state in \pOm{} pairs.

Figures (7)

• Figure 1: The $p$$-$$\Xi^{-}$ spin-averaged $f_0$ obtained from simultaneously LL fit in Isobar and Au+Au collisions by Bayesian method. Red solid points represent the results from simultaneous fits. The black points indicate the results for the three individual systems. The green band shows the prediction from HAL QCD.
• Figure 2: Measured $\Lambda$$-$$\Lambda$ correlation functions in 0-60% centrality in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV. Black bars and boxes represent the statistical and systematic uncertainties. Different colored lines represent UrQMD model simulation with different potentials given by different theories.
• Figure 3: Correlation functions for $p$$-$$\Omega^{-}$ measured in Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV. The magenta lines show fits using the LL model with the spin-averaged method, while gray dashed lines represent Coulomb-only contributions. Blue bands indicate HAL QCD predictions. Insets zoom in near unity.
• Figure 4: The ratio of correlation functions in different centralities. Different colorful lines represent different model calculations using different potentials.
• Figure 5: (a)The extracted $p$$-$$\Omega^{-}$ scattering parameters $f_0$ and $d_0$, are shown as probability contours from spin-averaged (red) and quintet (blue) method. Blue bands show 1–3$\sigma$ confidence levels from the quintet method. (b)The $p$$-$$\Omega^{-}$ binding energy calculated from the extracted $f_0$ and $d_0$ is shown for the spin-averaged and quintet fits.