Phys. Rev. Lett. 102, 182001 (2009) [4 pages]Measurement of Angular Distributions of Drell-Yan Dimuons in p+p Interactions at 800 GeV/cReceived 27 November 2008; published 7 May 2009 We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a hydrogen target. The polar and azimuthal angular distribution parameters have been extracted over the kinematic range 4.5<mμμ<15 GeV/c2 (excluding the Υ resonance region), 0<pT<4 GeV/c, and 0<xF<0.8. The p+p angular distributions are similar to those of p+d, and both data sets are compared with models which attribute the cos2ϕ distribution either to the presence of the transverse-momentum-dependent Boer-Mulders structure function h1⊥ or to QCD effects. The data indicate the need to include QCD effects before reliable information on the Boer-Mulders function can be extracted. The validity of the Lam-Tung relation in p+p Drell-Yan data is also tested. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.182001
DOI:
10.1103/PhysRevLett.102.182001
PACS:
13.85.Qk, 13.88.+e, 14.20.Dh, 24.85.+p
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