Measurement Of Decay Angular Distributions Of Drell-Yan Events For P(-)D Interaction At 800 Gev/C

J. C. Peng, L. Y. Zhu,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. Koetke,D. 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

AIP Conference Proceedings（2006）

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摘要

We report preliminary results from a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. No significant cos2 phi dependence is found in these proton-induced Drell-Yan data, in contrast to the situation for pioninduced Drell-Yan. The data are compared with expectations from models which attribute the cos2 phi distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h(1).

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关键词

Drell-Yan,cos2 phi angular distributions,Lam-Tung relation,Boer-Mulders function

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