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

L. Y. Zhu·J. C. Peng·P. E. Reimer·T. C. Awes·M. L. Brooks·C. N. Brown
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Abstract

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 $θ$ and azimuthal angle $ϕ$ have been measured over the kinematic range $4.5 < m_{μμ} < 15$ GeV/c$^2$, $0 < p_T < 4 $ GeV/c, and $0 < x_F < 0.8$. No significant cos$2ϕ$ 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$2ϕ$ 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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L. Y. Zhu, J. C. Peng, P. E. Reimer, T. C. Awes, M. L. Brooks, C. N. Brown. 2006-09-06. Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c. https://doi.org/10.1103/physrevlett.99.082301

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