Speaker
Description
Hypernuclei are bound states of nuclei with one or more hyperons. Hypertriton $\rm {}^{3}_{\Lambda}H$ ($np\Lambda$) and $\rm {}^{4}_{\Lambda}H$ ($nnp\Lambda$) are the two simplest observed hypernuclei. The $\rm {}^{3}_{\Lambda}H$ is the loosest bound hypernucleus, with a $\Lambda$ binding energy of $\sim$0.1 MeV, while the $\rm {}^{4}_{\Lambda}H$ is more strongly bound, with a $\Lambda$ binding energy of $\sim$2 MeV. Precise measurements of $\rm {}^{3}_{\Lambda}H$ and $\rm {}^{4}_{\Lambda}H$ yields in heavy ion collisions provide important guidance on the understanding of hypernuclei production mechanisms as well as the role of the hyperon-nucleon ($Y$-$N$) interaction in hypernuclei formation. The second phase of the Beam Energy Scan program at RHIC (BES-II) offers a great opportunity to investigate collision energy and system size dependence of hypernuclei production.
In this poster, the measurements of the production yields of $\rm {}^{3}_{\Lambda}H$ and $\rm {}^{4}_{\Lambda}H$ and their ratios to $\Lambda$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 3.2, 3.5, 3.9 and 4.5 GeV will be presented. The rapidity (y) and centrality dependence of the production yields (dN/dy) of $\rm {}^{3}_{\Lambda}H$ and $\rm {}^{4}_{\Lambda}H$ will also be reported. The physics implications of these results will be discussed together with theoretical model calculations.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | STAR Collaboration |
