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29 March 2024
 
  » arxiv » 0811.4589

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Measurement of Angular Distributions of Drell-Yan Dimuons in $p + p$ Interactions at 800 GeV/c
L. Y. Zhu ; J. C. Peng ; P. E. Reimer ; T. C. Awes ; M. L. Brooks ; C. N. Brown ;
Date 27 Nov 2008
AbstractWe 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 $4.5 < m_{mu mu} < 15$ GeV/c$^2$ (excluding the $Upsilon$ resonance region), $0 < p_T < 4 $ GeV/c, and $0 < x_F < 0.8$. The $p+p$ angular distributions are similar to those of $p+d$, and both data sets are compared with models which attribute the $cos 2 phi$ distribution either to the presence of the transverse-momentum-dependent Boer-Mulders structure function $h_1^perp$ or to QCD effects. The data indicate the presence of both mechanisms. The validity of the Lam-Tung relation in $p+p$ Drell-Yan is also tested.
Source arXiv, 0811.4589
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