50th International Symposium on Multiparticle Dynamics (ISMD2021)

Lifetime measurements of $^3_{\Lambda}H$ and $^4_{\Lambda}H$ in Au+Au Collisions at $\sqrt{s_{NN}}$ = 7.2 GeV from STAR experiment

13 Jul 2021, 19:50

2m

Poster or pre-recorded talk Poster Session

Speaker

Ms Xiujun Li (the STAR Collaboration, University of Science and Technology of China)

Description

Hypernuclei are bound nuclear systems of nucleons and hyperons. As such, hypernuclei are correlated hyperon-baryon systems and therefore provide direct access to study the hyperon$-$nucleon (Y-N) interaction. Production of hypernuclei in heavy-ion collisions provides an experimental avenue for studying the Y-N interaction. $\Lambda$ hypernuclei, such as $^3_{\Lambda}H$ and $^4_{\Lambda}H$, are usually understood as a weakly bound system of a $\Lambda$ and a nucleus. According to this concept, the $\Lambda$ maintains its identity even if embedded in a system of other nucleons. Since the lifetime of a hypernucleus depends on the strength of the Y-N interaction, precise lifetime measurements of hypernuclei help us to understand the Y-N interaction.\

In this talk, we will present the first lifetime measurements of $^3_{\Lambda}H$ and $^4_{\Lambda}H$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 7.2 GeV, recorded by the STAR experiment with a fixed target mode in the year 2018.