We present predictions for the non-singlet Drell-Yan longitudinal spin cross sections and spin asymmetry, ALL, in proton-proton collisions at large pT at the RHIC energy of 200\gev at next-to-leading order QCD. The higher order corrections to the non-singlet polarized cross section, σNSLL, are sizeable and similar to those found for the unpolarized cross section. The non-singlet asymmetry parameter, ALLNS, is very stable against higher order corrections and is a direct measurement of the non-singlet (i.e. valence) polarized quark distributions within the proton.
Cite
@article{arxiv.hep-ph/9803280,
title = {Drell-Yan Non-Singlet Spin Cross Sections and Spin Asymmetry to $O(\alpha_s^2)$ (II)},
author = {Sanghyeon Chang and Claudio Coriano and R. D. Field},
journal= {arXiv preprint arXiv:hep-ph/9803280},
year = {2014}
}