DRELL-YAN NON-SINGLET SPIN CROSS-SECTIONS AND SPIN ASYMMETRY TO O(ALPHA(S)(2)) (II)

We present predictions for the non-singlet Drell-Yan longitudinal spin cross sections and spin asymmetry, A(LL), in proton-proton collisions at large p(T) at the RHIC energy of 200 GeV at next-to-leading order QCD, The higher order corrections to the non-singlet polarized cross s ection, sigma(NS)(LL), are sizeable and similar to those found for the unpolarized cross section. The non-singlet asymmetry parameter, A(LL) (NS), is very stable against higher order corrections and is a direct measurement of the non-singlet (i.e., valence) polarized quark distrib utions within the proton. (C) 1998 Elsevier Science B.V.