paper

Direct photons and dileptons via color dipoles

arXiv:0704.0642 · doi:10.1016/j.physletb.2007.07.055

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 $s = 200$ GeV, and for $p p ˉ$ collisions at Tevatron energies $s = 1.8$ TeV, in a formalism that is free from any extra parameters.

7 pages, 4 figures. Results unchanged, two new plots added to show (data-theory)/theory, NLO pQCD curve is added. To appear in PLB