Measurements of Vector Meson Global Spin Alignment in Heavy-Ion Collisions at RHIC

STAR collaboration observed a global spin alignment of φ-mesons in Au+Au collisions using the data from the first phase of the RHIC Beam Energy Scan program (BES- I) [1]. This cannot be explained by conventional mechanisms but may be attributable to the influence of vector meson force fields. In these proceedings, we present new differential measurements of φ-meson global spin alignment with respect to transverse momentum (pT), centrality, and rapidity (y) using higher-statistics Au+Au data at √sNN = 14.6 and 19.6 GeV from the BES-II program. These differential measurements can help understand the roles of the φ-meson force field in nucleon and nuclear structure, in addition to the evolution of nuclear matter.