Phys. Rev. Lett. 102, 182001 (2009) [4 pages]
Measurement of Angular Distributions of Drell-Yan Dimuons in p+p Interactions at 800 GeV/c
Abstract
References (30)
Citing Articles
L. Y. Zhu, 5,7 J. C. Peng, 7,8 P. E. Reimer, 2,8 T. C. Awes, 11 M. L. Brooks, 8 C. N. Brown, 3 J. D. Bush, 1 T. A. Carey, 8 T. H. Chang, 10 W. E. Cooper, 3 C. A. Gagliardi, 12 G. T. Garvey, 8 D. F. Geesaman, 2 E. A. Hawker, 12 X. C. He, 4 L. D. Isenhower, 1 D. M. Kaplan, 6 S. B. Kaufman, 2 S. A. Klinksiek, 9 D. D. Koetke, 13 D. M. Lee, 8 W. M. Lee, 3,4 M. J. Leitch, 8 N. Makins, 2,7 P. L. McGaughey, 8 J. M. Moss, 8 B. A. Mueller, 2 P. M. Nord, 13 V. Papavassiliou, 10 B. K. Park, 8 G. Petitt, 4 M. E. Sadler, 1 W. E. Sondheim, 8 P. W. Stankus, 11 T. N. Thompson, 8 R. S. Towell, 1 R. E. Tribble, 12 M. A. Vasiliev, 12 J. C. Webb, 10 J. L. Willis, 1 D. K. Wise, 1 and G. R. Young11
(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
5Hampton University, Hampton, Virginia 23187, USA
6Illinois Institute of Technology, Chicago, Illinois 60616, USA
7University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
8Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
9University of New Mexico, Albuquerque, New Mexico 87131, USA
10New Mexico State University, Las Cruces, New Mexico 88003, USA
11Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
12Texas A&M University, College Station, Texas 77843, USA
13Valparaiso University, Valparaiso, Indiana 46383, USA
Received 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  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 cos2 distribution either to the presence of the transverse-momentum-dependent Boer-Mulders structure function h![<sub>1</sub><sup>[perpendicular]</sup>](http://scitation.aip.org/servlet/GetImg?key=PRLTAO000102000018182001000001%3A0%3A0%3A28&t=a&d=a) 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
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