Speaker
Description
Heavy-ion collisions offer a new way to understand nucleon-hyperon (N-Y) interactions. The two-particle correlation, which reveals valuable information about the space-time evolution of the particle-emitting source and final state interactions involving hyperons, is the primary observable of interest. The measurements of $\it p$-$\Lambda$ and $\it d$-$\Lambda$ correlations can shed light on the N-Y two body and the N-N-Y three body interactions, which are important to understand the inner structure and equation of state of neutron stars. Further, the measurement of $\it d$-$\Lambda$ correlations provides insight into the internal structure and binding energy of light hypernuclei.
In this talk, we present the precise measurement of $\it p$-$\Lambda$ correlation using high statics data and the first measurement of $\it d$-$\Lambda$ correlation with $\sqrt{s_{_{\rm NN}}}=$ 3 GeV Au+Au collisions from the fixed-target program at the STAR experiment. The correlation functions are analyzed within the Lednicky-Lyuboshitz formalism in order to characterize the emission source size, the scattering length, and the effective range of $\it p$-$\Lambda$ and $\it d$-$\Lambda$ interactions. The extracted parameters will be compared to those from other baryon correlations ($\it p$-$\it p$, $\it d$-$\it d$, $\Lambda$-$\Lambda$) and various effective theory model calculations. Finally, physics implications on final state interactions involving hyperons and the hypertriton inner structure will be discussed.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | STAR Collaboration |
