Abstract

Drell-Yan dilepton pair production and inclusive direct photon production can be described within a unified framework in the color dipole approach. The inclusion of non-perturbative primordial transverse momenta and DGLAP evolution is studied. We successfully describe data for dilepton spectra from 800-GeV pp collisions, inclusive direct photon spectra for pp collisions at RHIC energies sqrt(s) = 200  GeV, and for p over(p, ̄) collisions at tevatron energies sqrt(s) = 1.8  TeV, in a formalism that is free from any extra parameters. © 2007 Elsevier B.V. All rights reserved.