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\title{Measurements on the energy dependence of light hypernuclei production at STAR}
\author{Yuanjing Ji, for the STAR collaboration \\ Lawrence Berkeley National Laboratory}

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Hypernuclei are bound states of nucleons and hyperons. Model calculations predict that hypernuclei are abundantly produced at high baryon density regions. Nevertheless, the production mechanisms of hypernuclei in heavy-ion collisions remain not well understood. Measurements on the production yields of hypernuclei are crucial to the investigation of hypernuclei production mechanisms and the strength of hyperon-nucleon ($Y$-$N$) interactions.

Thanks to the high statistical data taken from the STAR BES II program in 2018-2021, a series of measurements on production yields of light hypernuclei at low energies are carried out. In this talk, the rapidity and energy dependence of light hypernuclei ($^{3}_{\Lambda}{\rm H}$, $^{4}_{\Lambda}{\rm H}$, $^{4}_{\Lambda}{\rm He}$) yields in Au+Au $\sqrt{s_{\rm NN}}=$ 3, 19.6, and 27 GeV collisions will be presented. $^{3}_{\Lambda}{\rm H}$ will be reconstructed via both $^{3}_{\Lambda}\mathrm{H}\rightarrow\mathrm{^{3}He}\pi$ and $\rm ^{3}_{\Lambda}H\mathrm{\rightarrow dp\pi}$ channels. The ratio of hypernuclei and light nuclei production yields will also be presented. The results will be compared with coalescence and thermal model calculations. The physics implications will be discussed.

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