Global polarization of hyperons in Au + Au collisions at sNN=200 GeV Academic Article uri icon

abstract

  • 2018 American Physical Society. Global polarization of hyperons has been measured to be of the order of a few tenths of a percentage in Au+Au collisions at sNN = 200 GeV, with no significant difference between and . These new results reveal the collision energy dependence of the global polarization together with the results previously observed at sNN = 7.7-62.4 GeV and indicate noticeable vorticity of the medium created in noncentral heavy-ion collisions at the highest Relativistic Heavy Ion Collider collision energy. The signal is in rough quantitative agreement with the theoretical predictions from a hydrodynamic model and from a multi-phase transport model. The polarization is larger in more peripheral collisions, and depends weakly on the hyperon's transverse momentum and pseudorapidity H within |H|<1. An indication of the polarization dependence on the event-by-event charge asymmetry is observed at the 2 level, suggesting a possible contribution to the polarization from the axial current induced by the initial magnetic field.

published proceedings

  • Physical Review C

author list (cited authors)

  • Adam, J., Adamczyk, L., Adams, J. R., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., ... Zyzak, M.

publication date

  • January 1, 2018 11:11 AM