production in polarised p – p scattering as a probe of the proton spin structure

production in polarised p–p scattering as a probe of the proton spin structure Abstract We present the results of a detailed study of the large transverse momentum Drell-Yan process, pp → (γ * , Z *)X → l + l − X at collider energies, with either one or both protons polarised, allowing the study of single-and double-spin asymmetries respectively. We show how these asymmetries obtained from angular distributions of the leptons in the γ * (or Z *) rest frame, can be used to get information on the polarised parton distributions. Numerical results for the asymmetries and the cross-sections are presented, and the sensitivity of the asymmetries to the initial parton distributions indicates that these can be used as effective probes of the spin structure of the proton.