Azimuthal angle dependence of the longitudinal spin polarization in relativistic heavy ion collisions Academic Article uri icon

abstract

  • © 2019 American Physical Society. The longitudinal quark spin polarization along the beam direction in noncentral relativistic heavy ion collisions is studied in the chiral kinetic approach. Its azimuthal angle dependence in the transverse plane of the collision is found to have a quadrupole structure as in studies from hydrodynamic and transport models based on the relativistic spin-vorticity coupling in a thermodynamically equilibrated hadronic matter at kinetic freeze-out. The direction of the quark longitudinal spin polarization is, however, opposite to that from these models, and this is due to the axial charge current induced by the transverse component of the vorticity field in the chiral kinetic approach. Our finding is consistent with the azimuthal angle dependence of the longitudinal spin polarization of Λ hyperons, which is mainly determined by that of the strange quark, recently measured in the experiments by the STAR Collaboration at the BNL Relativistic Heavy Ion Collider.

altmetric score

  • 0.25

author list (cited authors)

  • Sun, Y., & Ko, C. M.

citation count

  • 18

publication date

  • January 2019