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Title: Local and global Λ polarization in a vortical fluid

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.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [4]
  1. Univ. of Science and Technology of China, HeFei (China)
  2. Frankfurt Institute for Advanced Studies, Frankfurt am Main (Germany); Goethe Univ., Frankfurt (Germany); GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  3. Frankfurt Institute for Advanced Studies, Frankfurt am Main (Germany); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Central China Normal Univ., Wuhan (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
Journal Volume: 967; Journal Issue: C; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Vorticity; Polarization; Spin distribution and correlation
OSTI Identifier:
1421842