Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c

Details Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c

2006-09-06

arxiv.org/abs/hep-ex/0609005v1

Phys.Rev.Lett.99:082301,2007

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.082301

We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. The muon angular distributions in polar angle $\theta$ and azimuthal angle $\phi$ have been measured over the kinematic range $4.5 < m_{\mu \mu} < 15$ GeV/c$^2$, $0 < p_T < 4 $ GeV/c, and $0 < x_F < 0.8$. No significant cos$2\phi$ dependence is found in these proton-induced Drell-Yan data, in contrast to the situation for pion-induced Drell-Yan. The data are compared with expectations from models which attribute the cos$2\phi$ distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function $h_1^\perp$. Constraints on the magnitude of the sea-quark $h_1^\perp$ structure functions are obtained.

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