Flavor separation of the Boer-Mulders function from unpolarized ${\pi }^{-}p$ and ${\pi }^{-}D$ Drell-Yan processes

Abstract

We show that measuring the $\cos 2\varphi$ angular dependence in unpolarized Drell-Yan processes with ${\pi }^{-}$ beams colliding on proton and deuteron targets can determine the ratio of the Boer-Mulders functions for $d$ and $u$ quarks inside the proton $h_1^{\perp ,d}/h_1^{\perp ,u}$, which is still lack of theoretical constraint. The comparison of the $\cos 2\varphi$ asymmetries measured in unpolarized ${\pi }^{-}p$ and ${\pi }^{-}D$ Drell-Yan processes, which are accessible at CERN by the COMPASS collaboration, can help to discriminate whether $h_1^{\perp }$ effects or QCD vacuum effects are preferred by data.

arXiv comment10 pages, 2 figures, published in Physics Letters B

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Cited by in corpus (20)

• Distribution Functions of the Nucleon and Pion in the Valence Region
• Dilepton production from polarized hadron hadron collisions
• Transverse Quark Spin Effects and the Flavor Dependence of the Boer-Mulders Function
• Flavor Structure of the Nucleon Sea
• Extracting Boer-Mulders functions from $p+D$ Drell-Yan processes
• Final state interactions and the transverse structure of the pion using non-perturbative eikonal methods
• Updating Boer-Mulders functions from unpolarized pd and pp Drell-Yan data
• Azimuthal asymmetries in lepton-pair production at a fixed-target experiment using the LHC beams (AFTER)
• $\cos 2\varphi$ asymmetries in unpolarized semi-inclusive DIS
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• Single spin asymmetry in $\pi p$ Drell-Yan process
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• Transverse Spin Effects in Future Drell-Yan Experiments
• Mapping the internal structure of hadrons through color and spin effects