Spin transfer to Λ + c hyperons in polarized proton collisions at RHIC

Spin transfer to Λ + c hyperons in polarized proton collisions at RHIC The analysis[1] of helicity transfer to Λ + c in polarized proton collisions is extended to the proton helicity correlations with the Λ + c transverse polarization in the production plane (parameter D LS). The available spin transfer observ-ables for the collisions of two longitudinally polarized protons are evaluated. It is shown that, in the central region at Λ + c transverse momenta of a few GeV/c, D LS parameters are of about the same size as the helicity-to-helicity correlations. The methodical issue of using spin transfers for cross-checks of systematic errors in cross-section A LL measurements at polarized proton colliders is also briefly discussed.