Longitudinal spin transfer to A and A hyperons in polarized proton-proton collisions at Vs = 200 GeV

The longitudinal spin transfer, D LL , from high energy polarized protons to A and Λ hyperons has been measured for the first time in proton-proton collisions at Vs = 200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. The measurements cover pseudorapidity, η, in the range |η| < 1.2 and transverse momenta, p T , up to 4 GeV/c. The longitudinal spin transfer is found to be D LL = ―0.03 ± 0.13(stat) ± 0.04(syst) for inclusive A and D LL = ―0.12 ± 0.08(stat) ± 0.03(syst) for inclusive Λ hyperons with 〈η〉 = 0.5 and (p T ) = 3.7 GeV/c. The dependence on η and p T is presented.