Measurement of angular distributions of Drell-Yan dimuons in p+p interactions at 800GeV/c

L. Y. Zhu, J. C. Peng, P. E. Reimer, T. C. Awes, M. L. Brooks, C. N. Brown, J. D. Bush, T. A. Carey, T. H. Chang, W. E. Cooper, C. A. Gagliardi, G. T. Garvey, D. F. Geesaman, E. A. Hawker, X. C. He, L. D. Isenhower, D. M. Kaplan, S. B. Kaufman, S. A. Klinksiek, D. D. KoetkeD. M. Lee, W. M. Lee, M. J. Leitch, N. Makins, P. L. McGaughey, J. M. Moss, B. A. Mueller, P. M. Nord, V. Papavassiliou, B. K. Park, G. Petitt, M. E. Sadler, W. E. Sondheim, P. W. Stankus, T. N. Thompson, R. S. Towell, R. E. Tribble, M. A. Vasiliev, J. C. Webb, J. L. Willis, D. K. Wise, G. R. Young

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Abstract

We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800GeV/c proton beam on a hydrogen target. The polar and azimuthal angular distribution parameters have been extracted over the kinematic range 4.5<mμμ<15GeV/c2 (excluding the Υ resonance region), 0<pT<4GeV/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 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.

Original languageEnglish (US)
Article number182001
JournalPhysical review letters
Volume102
Issue number18
DOIs
StatePublished - May 7 2009

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Zhu, L. Y., Peng, J. C., Reimer, P. E., Awes, T. C., Brooks, M. L., Brown, C. N., Bush, J. D., Carey, T. A., Chang, T. H., Cooper, W. E., Gagliardi, C. A., Garvey, G. T., Geesaman, D. F., Hawker, E. A., He, X. C., Isenhower, L. D., Kaplan, D. M., Kaufman, S. B., Klinksiek, S. A., ... Young, G. R. (2009). Measurement of angular distributions of Drell-Yan dimuons in p+p interactions at 800GeV/c. Physical review letters, 102(18), [182001]. https://doi.org/10.1103/PhysRevLett.102.182001