Measurement of Angular Distributions of Drell-Yan Dimuons in p+p Interactions at 800 GeV/c
- University of Illinois, Urbana-Champaign
- ORNL
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 < m{sub {mu}{mu}} < 15 GeV/c{sup 2} (excluding the {Upsilon} resonance region), 0 < p{sub T} < 4 GeV/c, and 0 < x{sub F} < 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 cos2{phi} distribution either to the presence of the transverse-momentum-dependent Boer-Mulders structure function h{sub 1}{sup {perpendicular}} 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 952226
- Journal Information:
- Physical Review Letters, Vol. 102, Issue 18; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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