Constraints on spin observables inp¯p→Λ¯Λ

It is recalled that spin observables in the strangeness-exchange reaction $\overline{p}\overrightarrow{p}\overline{\Lambda }\Lambda$ are not independent, but are related to each other by simple algebraic relations. This provides constraints on the existing data on polarization and spin-correlation coefficients and also on forthcoming data obtained using a polarized proton target.