We analyze xFβ dependence of Drell-Yan transverse momentum broadening in
hadron-nucleus collisions. In terms of generalized factorization theorem, we
show that the xFβ dependence of transverse momentum broadening, Ξ<qT2β>(xFβ), can be calculated in perturbative QCD. We demonstrate that
Ξ(xFβ) is a good observable for studying the effects of
initial-state multiple scattering and extracting quark-gluon correlation
functions.Comment: 10 pages, 3 figure