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STAR collaboration observed a global spin alignment of -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 -meson global spin alignment with respect to transverse momentum (pₓ), centrality, and rapidity (y) using higher-statistics Au+Au data at s ₍₍ = 14. 6 and 19. 6 GeV from the BES-II program. These differential measurements can help understand the roles of the -meson force field in nucleon and nuclear structure, in addition to the evolution of nuclear matter.
Gavin Wilks (Tue,) studied this question.