Two-component source to explain ΛandΛ¯ global polarization in non-central heavy-ion collisions

Abstract

Abstract The STAR Beam Energy Scan program has found a difference in the global polarization of Λ s and Λ ¯ s produced in Au + Au collisions. This difference is larger for lower center of mass collision energies. In this work we show that a two-component source, consisting of a high density core and a lower density corona, can describe quantitatively the Λ and Λ ¯ polarizations as a function of collision energy.