New hypernuclei measurements from STAR

Hypernuclei are bound states of hyperons (Y) and nucleons (N). Measurements on their yields can help us investigate their production mechanisms. In particular, the Λ 5 He and Λ 4 H(e) are substantially tighter bound compared to the Λ 3 He. The large radius of the Λ 3 He leads to suppression in coalescence models, but not in the thermal model where the size of the nucleus does not play a role. As such, studying the A = 3–5 hypernuclei yields allow us to extract information on the effects of hypernuclear binding on hypernuclei production in heavy-ion collisions. In these proceedings, we present measurements of Λ 5 He yields in Au+Au collisions at √ s NN = 3.0 GeV, Λ 4 H(e) yields in Au+Au collisions at √ s NN = 3.0−4.5 GeV, and Λ 3 H yields in Au+Au collisions at √ s NN = 3−27 GeV. Results on the directed flow of hypernuclei are also reported. The physics implications of these measurements are discussed.