NNLO corrections to the polarized Drell-Yan coefficient function

Abstract

We present the full next-to-next-to-leading order (NNLO) corrections to the coefficient function for the polarized cross section dΔs/dQ of the Drell-Yan process. We study the effect of these corrections on the process p⁺p→l⁺l^-+'X' at an C.M. energy √S = 200 GeV. All QCD partonic subprocesses have been included provided the lepton pair is created by a virtual photon, which is a valid approximation for a lepton pair invariant mass Q < GeV. For this reaction the dominant subprocess is given by q + q^-→γ^∗+'X' and its higher order corrections so that it provides us with an excellent tool to measure the polarized sea-quark densities.