https://doi.org/10.1051/epjconf/201920604003
Λ(
) polarization in Au+Au collisions at RHIC
1
Key Labratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China
2
Brookhaven National Laboratory, Upton, NY 11973, USA
* e-mail: tubiao@mails.ccnu.edu.cn
Published online: 19 April 2019
Initial large global angular momentum in non-central relativistic heavy-ion collisions can produce strong vorticity, and through the spin-orbit couping, causes the spin of particles to align with the system’s global angular momentum. We present the azimuthal angle dependent (relative to the first-order plane) global polarization for Λ hyperons in midcentral Au+Au collisions at 
= 200 GeV. We also present the polarization of Λ hyperons along the beam direction as a function of Λ hyperons’ emission angle relative to the second-order event plane at 
= 200 GeV. This longitudinal polarization is found to increase in more peripheral collision. The implications of the results are discussed.
© The Authors, published by EDP Sciences, 2019
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