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

¹ Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
² Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China
³ Physics Department and Center for Exploration of Energy and Matter, Indiana University, 2401 N Milo B. Sampson Lane, Bloomington, IN 47408, USA

^* e-mail: liaoji@indiana.edu
^** e-mail: wangek@scnu.edu.cn
^*** e-mail: hxing@m.scnu.edu.cn
^**** e-mail: mr.zhanghui@m.scnu.edu.cn

Published online: 1 February 2022

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 √S_NN = 7.7 GeV. In addition, local polarization patterns are also computed in the same energy regime.