Practical Considerations for Measuring Global Spin Density Matrix Elements of Vector Mesons in Heavy-Ion Collisions

Gavin Wilks, Xu Sun, Zhenyu Ye

The STAR Collaboration has reported a significant $\varphi$-meson global spin alignment (${\rho }_{00}$) signal in Au+Au collisions at $\sqrt{s_{NN}}\le 62$ GeV by measuring the polar angle di…