Experimental Studies of Global Polarization in Heavy-ion Collisions
The huge orbital angular momentum generated by non-central relativistic heavy-ion collisions in the reaction zone can be transferred to the quark-gluon plasma(QGP)in the form of fluid vortices.Partons in the QGP will be polarized along the angular momentum through the spin-orbit interaction,the so-called"Globla Polarization".After nearly two decades of ex-ploration,experimental data on the global polarization of Λ hyperons and φ,K*0 vector mesons in heavy-ion collisions have confirmed a new phenomenon of QGP global polarization,which has attracted widespread attention from researchers and be-come a new hot direction in the forefront of high-energy nuclear physics.This paper briefly describe the experimental meas-urements of global polarization in heavy-ion collisions,focusing on the global polarization of Λ hyperons and the spin align-ment of φ,K*0 mesons,followed by a brief discussion of the physics information provided by the experimental data.
heavy-ion collisionQGP global polarizationhyperon polarizationvector meson spin alignment
NETL
NSTL
万方数据
