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Article overview
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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 | Abstract: | 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 $4.5 < m_{mu mu} < 15$ 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 | Services: | Forum | Review | PDF | Favorites |
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