%0 Journal Article
%T Angular Dependence of the Nuclear Enhancement of Drell-Yan Pairs
%A R. J. Fries
%A B. M¨¹ller
%A A. Sch£¿fer
%A E. Stein
%J Physics
%D 1999
%I arXiv
%R 10.1103/PhysRevLett.83.4261
%X We calculate the nuclear enhancement in the angular distribution of Drell-Yan pairs produced in proton-nucleus reactions. Nuclear effects are encoded in universal twist-4 parton correlation functions. We find that the Lam-Tung relation for the angular coefficients of the lepton-pair distribution holds for the double-hard, but not for the soft-hard contribution. We also predict that nuclear enhancement effects at RHIC energies can be large.
%U http://arxiv.org/abs/hep-ph/9907567v3