Measurements of p − Λ and d − Λ correlations in 3 GeV Au+Au collisions at STAR

Lawrence Berkeley National Laboratory

^* e-mail: yuhu@lbl.gov

Published online: 26 June 2024

Abstract

Heavy-ion collisions provide a unique opportunity to explore nucleon-hyperon (N-Y) interactions through two-particle correlations. The p − Λ and d − Λ correlations shed light on both N-Y two-body and N-N-Y three-body interactions, which is crucial for understanding neutron star properties. We present the high precision measurement of p − Λ and the first measurement of d − Λ correlation with √S_NN = 3 GeV Au+Au collisions at STAR. Using the Lednicky-Lyuboshitz formalism, we characterized emission source size, the scattering length (f₀), and the effective range (d₀) of p − Λ and d − Λ interactions. Using the f₀ and d₀ extracted from two spin states in d − Λ correlation, the parameters from the doublet state indicate the hypertriton binding energy is consistent with the current average of world measurements.