TY  - JOUR
A1  - Li, Hui
A1  - Petersen, Hannah
A1  - Pang, Long-Gang
A1  - Wang, Qun
A1  - Xia, Xiao-Liang
A1  - Wang, Xin-Nian
T1  - Local and global Λ polarization in a vortical fluid
T2  - Nuclear Physics A
N2  - We compute the fermion spin distribution in the vortical fluid created in off-central high energy heavy-ion collisions. We employ the event-by-event (3+1)D viscous hydrodynamic model. The spin polarization density is proportional to the local fluid vorticity in quantum kinetic theory. As a result of strong collectivity, the spatial distribution of the local vorticity on the freeze-out hyper-surface strongly correlates to the rapidity and azimuthal angle distribution of fermion spins. We investigate the sensitivity of the local polarization to the initial fluid velocity in the hydrodynamic model and compute the global polarization of Λ hyperons by the AMPT model. The energy dependence of the global polarization agrees with the STAR data.
KW  - Vorticity
KW  - Polarization
KW  - Spin distribution and correlation
Y1  - 2017
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/77360
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-773606
SN  - 0375-9474
VL  - 967
SP  - 772
EP  - 775
PB  - Elsevier
CY  - Amsterdam
ER  -