Phys. Rev. Lett. 99, 082301 (2007) [5 pages]Measurement of Angular Distributions of Drell-Yan Dimuons in p+d Interactions at 800 GeV/cReceived 5 September 2006; published 20 August 2007 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<mμμ<15 GeV/c2, 0<pT<4 GeV/c, and 0<xF<0.8. No significant cos2ϕ 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 cos2ϕ distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h1⊥. Constraints on the magnitude of the sea-quark h1⊥ structure functions are obtained. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.082301
DOI:
10.1103/PhysRevLett.99.082301
PACS:
25.40.Ve, 13.85.Qk, 13.88.+e, 25.10.+s
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