Considerations on measuring spin-spin correlation of hyeprons in heavy-ion experiments

The significant global spin alignment observed for φ mesons in heavy-ion collisions has sparked intense discussions about its origin and implications. One explanation suggests that fluctuations in the strong force field may introduce strong spin correlations between strange (s) and anti-strange (s̄) quarks, leading to the global spin alignment of φ mesons. Extending this line of research, the theoretical community has proposed studying the spin correlation between Λ and Λ̄ hyperons. In this paper, we construct experimental observables and make connections between them and the theoretical proposed quantities.