Paper
The Drell-Yan Process and Factorization in Impact Parameter Space
Authors
S. J. Brodsky, A. Hebecker, E. Quack
Abstract
The cross section for Drell-Yan pair production in the limit of small -target is derived in the rest frame of the target hadron. Our calculation is based on the fundamental quantity , the cross section for the scattering of a -pair with fixed transverse separation off a hadronic target. As in deep inelastic scattering the result can be given in terms of integrals of . This is consistent with well known factorization theorems and also relates higher-twist terms in both processes. An analysis of the angular distribution of the produced lepton shows that additional integrals of can be obtained in the Drell-Yan process, which are not measurable in inclusive deep inelastic scattering.