Orateur
Description
Hypernuclei, which are bound states of nuclei with at least one hyperon, serve as excellent experimental probes for studying the hyperon-nucleon ($Y$-$N$) interaction.
The A=4 mirror hypernuclei ($^{4}_{\Lambda}$H(0$^+$) and $^{4}_{\Lambda}$He(0$^+$)) is substantially tighter bound compared to the hypertriton ($^{3}_{\Lambda}$H). The existence of the spin-1 excited states ($^{4}_{\Lambda}$H$^{*}$(1$^+$) and $^{4}_{\Lambda}$He$^{*}$(1$^+$)) may also enhance the measured yields through feed-down. As such, their yields allow us to gain insight on the effects of hypernuclear binding, spin and isospin content on their production in heavy-ion collisions.
In this talk, we will present the first measurements of A=4 hypernuclei ($^{4}_{\Lambda}$H and $^{4}_{\Lambda}$He) production from the RHIC-STAR experiment utilizing the fixed target datasets.
The transverse momentum $p_{\rm T}$ spectra and yields $dN/dy$ as a function of rapidity will be shown from $\sqrt{s_{\rm NN}}$ = 3.0, 3.2, 3.5 and 3.9 GeV Au+Au collisions.
The $dN/dy$ and $
Furthermore, calculations from thermal model and transport model (JAM) plus coalescence afterburner will be compared to these results and the relevant physics implications will be discussed.
