Hyperon Global Polarization in Nucleus-Nucleus Collisions at sub-10-GeV Beam Energy

Abstract

In this contribution, we report AMPT model study for the hyperon global polarization in the heavy ion collision, especially in the interesting Ô (1 ~ 10) GeV energy region. We find a non-monotonic trend, with the global polarization to first increase and then decrease when beam energy is lowered from 27 GeV down to 3 GeV, with a maximum polarization signal located around √SNN = 7.7 GeV$\sqrt {{S_{NN}}} = 7.7\,{\rm{GeV}}$SNN=7.7 GeV. In addition, local polarization patterns are also computed in the same energy regime.