Author:
Li Xiaowen,Jiang Ze-Fang,Cao Shanshan,Deng Jian
Abstract
AbstractExtremely large angular orbital momentum can be produced in non-central heavy-ion collisions, leading to a strong transverse polarization of partons that scatter through the quark-gluon plasma (QGP) due to spin-orbital coupling. We develop a perturbative approach to describe the formation and spacetime evolution of quark polarization inside the QGP. Polarization from both the initial hard scatterings and interactions with the QGP have been consistently described using the quark-potential scattering approach, which has been coupled to realistic initial condition calculation and the subsequent $$(3+1)$$
(
3
+
1
)
-dimensional viscous hydrodynamic simulation of the QGP for the first time. Within this improved approach, we have found that different spacetime-rapidity-dependent initial energy density distributions generate different time evolution profiles of the longitudinal flow velocity gradient of the QGP, which further lead to an approximately 15% difference in the final polarization of quarks collected on the hadronization hypersurface of the QGP. Therefore, in addition to the collective flow coefficients, the hyperon polarization may serve as a novel tool to help constrain the initial condition of the hot nuclear matter created in high-energy nuclear collisions.
Funder
Xiaogan Natural Science Foundation
National Natural Science Foundation of China
Education Department of Hubei Province of China with Young Talents Project
Natural Science Foundation of Hubei Province
Open Foundation of Key Laboratory of Quark and Lepton Physics
Guangdong Major Project of Basic and Applied Basic Research
Natural Science Foundation of Shandong Province
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
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