Measurement of angular distributions of Drell-Yan dimuons in p+d 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

Research output: Contribution to journalArticlepeer-review


We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800GeV/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<15GeV/c2, 0<pT<4GeV/c, and 0<xF<0.8. No significant cos 2 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 cos 2 distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h1 . Constraints on the magnitude of the sea-quark h1 structure functions are obtained.

Original languageEnglish (US)
Article number082301
JournalPhysical review letters
Issue number8
StatePublished - Aug 20 2007

ASJC Scopus subject areas

  • General Physics and Astronomy


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