Schmidt, I , Univ Tecn Federico Santa Maria, Dept Fis, Casilla 110-V, Valparaiso, Chile.
Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile; Peking Univ, Dept Phys, Beijing 100871, Peoples R China; CCAST, World Lab, Beijing 100080, Peoples R China; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; CNRS, Ctr Phys Theor, F-13288 Marseille 9, France; Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China
We consider the inclusive production of longitudinally polarized baryons in (p) over barp collisions at RHIC-BNL, with one longitudinally polarized proton. We study the spin transfer between the initial proton and the produced baryon as a function of its rapidity and we elucidate its sensitivity to the quark helicity distributions of the proton and to the polarized fragmentation functions of the quark into the baryon. We make predictions using an SU(6) quark spectator model and a perturbative QCD (pQCD) based model. We discuss these different predictions, and what can be learned from them, in view of the forthcoming experiments at RHIC-BNL. (C) 2001 Elsevier Science B.V. All rights reserved.