Measurements on the production and properties of light hypernuclei at STAR

Abstract

The hyperon-nucleon ($Y$-$N$) interaction, an important ingredient for the nuclear equation-of-state (EoS), remains poorly constrained. Precise measurements of hypernucei intrinsic properties and production yields in heavy-ion collisions are crucial for the understanding of their production mechanisms and the strength of the $Y$-$N$ interaction. Thanks to the high statistics data taken from the STAR BES II program, a series of hypernuclei measurements are carried out at low energies. In these proceedings, we present the kinematic and centrality dependence of light hypernuclei production yields and strangeness population factor ($S_3$, $S_4$) in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=$ 3 GeV. We also report the energy dependence of ${}_{\Lambda }^3\mathrm{H}$ yields and $S_3$ at mid-rapidity from 3 to 27 GeV Au+Au collisions. Precise measurements of ${}_{\Lambda }^4\mathrm{He}$ lifetime and ${}_{\Lambda }^3\mathrm{H}$ branching ratio are also reported. These results are compared with model calculations and physics implications are discussed.

Strangeness in Quark Matter 2022 proceedings

References in corpus (3)

• Hypernuclei, dibaryon and antinuclei production in high energy heavy ion collisions: Thermal production vs. Coalescence
• Measurements of ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\Lambda }^4\mathrm{H}$ Lifetimes and Yields in Au+Au Collisions in the High Baryon Density Region
• Cluster and hyper-cluster production in relativistic heavy-ion collisions within the Parton-Hadron-Quantum-Molecular-Dynamics approach