Polarization phenomena for p̄+p→Λ̄+Λ in collinear kinematics as a test of polarized strangeness

Polarization effects for the process p̄+p→Λ̄+Λ are studied for the collinear Λ-production. Using the triplet channel dominance hypothesis for the p̄p-annihilation, we prove that the longitudinal polarization transfer coefficient from the initial proton to final Λ hyperon must be positive in this kinematical regime, independently of any model. The exact value of this coefficient, however, depends on the sign of the strange quark contribution to the proton spin, for relatively small momentum transfer.