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 $p\bar{ p}$ collisions at Tevatron energies $\sqrt{ s}=1.8$ TeV, in a formalism that is free from any extra parameters.
Categories: hep-ph nucl-th