QCD non-abelian effects in Drell-Yan pair production at collider energies

A calculation of QCD non-abelian effects in Drell-Yan pair production is presented. The calculation makes use of a LLA Monte Carlo technique. Large deviations from the conventional non-singlet approximation, which neglects the non-abelian features of QCD, emerge at the energies of the CERN and Fermilab anti pp colliders. Specifically, the mean p/sub T/ of Drell-Yan pairs is expected to rise by factors when moving up to Fermilab collider energies at fixed dimuon mass. By contrast the conventional non-singlet (abelian) approximation yields a relatively flattish behavior