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Phys. Rev. Lett. 99, 082301 (2007) [5 pages]

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

L. Y. Zhu,6 J. C. Peng,6,7 P. E. Reimer,2,7 T. C. Awes,10 M. L. Brooks,7 C. N. Brown,3 J. D. Bush,1 T. A. Carey,7 T. H. Chang,9 W. E. Cooper,3 C. A. Gagliardi,11 G. T. Garvey,7 D. F. Geesaman,2 E. A. Hawker,11 X. C. He,4 L. D. Isenhower,1 D. M. Kaplan,5 S. B. Kaufman,2 S. A. Klinksiek,8 D. D. Koetke,12 D. M. Lee,7 W. M. Lee,3,4 M. J. Leitch,7 N. Makins,2,6 P. L. McGaughey,7 J. M. Moss,7 B. A. Mueller,2 P. M. Nord,12 V. Papavassiliou,9 B. K. Park,7 G. Petitt,4 M. E. Sadler,1 W. E. Sondheim,7 P. W. Stankus,10 T. N. Thompson,7 R. S. Towell,1 R. E. Tribble,11 M. A. Vasiliev,11 J. C. Webb,9 J. L. Willis,1 D. K. Wise,1 and G. R. Young10

(FNAL E866/NuSea Collaboration)

1Abilene Christian University, Abilene, Texas 79699, USA
2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
3Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
4Georgia State University, Atlanta, Georgia 30303, USA
5Illinois Institute of Technology, Chicago, Illinois 60616, USA
6University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
7Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
8University of New Mexico, Albuquerque, New Mexico 87131, USA
9New Mexico State University, Las Cruces, New Mexico 88003, USA
10Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
11Texas A&M University, College Station, Texas 77843, USA
12Valparaiso University, Valparaiso, Indiana 46383, USA

Received 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 cos2phi 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 cos2phi distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h<sub>1</sub><sup>[perpendicular]</sup>. Constraints on the magnitude of the sea-quark h<sub>1</sub><sup>[perpendicular]</sup> 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
  • 25.40.Ve
    Other nucleon-induced reactions above meson production thresholds (energies > 400 MeV)
  • 13.85.Qk
    Hadron-induced inclusive production with identified leptons, photons, or other nonhadronic particles (energy > 10 GeV)
  • 13.88.+e
    Polarization in elementary particle interactions and scattering
  • 25.10.+s
    Nuclear reactions involving few-nucleon systems
  • YEAR: 2007
KEYWORDS: deuterons, proton-nucleus reactions, quantum chromodynamics, vacuum (elementary particles)

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