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

Journal Article · Fri May 01 04:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.102.182001· OSTI ID:952226

Zhu, L Y ^[1]; Awes, Terry C ^[2]; Stankus, Paul W ^[2]; Young, Glenn R ^[2]

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1. University of Illinois, Urbana-Champaign
2. 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 Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 952226
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
ANGULAR DISTRIBUTION
DISTRIBUTION
HYDROGEN
PROTON BEAMS
QUANTUM CHROMODYNAMICS
RESONANCE
STRUCTURE FUNCTIONS