Measurement of angular distributions of drell-yan dimuons in p+d interactions at 800 GeV/c

We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. The muon angular distributions in the dilepton rest frame have been measured over the kinematic range 4.5 < m(mu mu)< 15 GeV/c(2), 0 < p(T)< 4 GeV/c, and 0 < x(F)< 0.8. No significant cos2 phi dependence is found in these proton-induced Drell-Yan data, in contrast with the situation for pion-induced Drell-Yan data. The data are compared with expectations from models which attribute the cos2 phi distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h(1)(perpendicular to). Constraints on the magnitude of the sea-quark h(1)(perpendicular to) structure functions are obtained.