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Paper

Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c

Abstract

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 polar angle and azimuthal angle have been measured over the kinematic range GeV/c, GeV/c, and . No significant cos dependence is found in these proton-induced Drell-Yan data, in contrast to the situation for pion-induced Drell-Yan. The data are compared with expectations from models which attribute the cos distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function . Constraints on the magnitude of the sea-quark structure functions are obtained.