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Angular Distributions in the Drell-Yan Process: A Closer Look at Higher Twist Effects

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arxiv hep-ph/9403361 v2 pith:Y5Y7NQJK submitted 1994-03-25 hep-ph

A. Brandenburg , S. J. Brodsky , V. V. Khoze , D. Müller This is my paper · ORCID
classification hep-ph
keywords distributionpionangularamplitudebounddrell-yaneffectsstate
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We calculate the angular distribution of the lepton produced in the Drell-Yan reaction taking into account pion bound state effects. We work in the kinematic region where one of the pion constituents goes far off-shell, which allows us to treat the bound state problem perturbatively. We show that the angular distribution is very sensitive to the shape of the pion distribution amplitude. The model we discuss fits the data if we choose a two-humped pion distribution amplitude suggested by QCD sum rules.

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  1. Dilepton angular distributions in the color-dipole $S$-matrix framework

    hep-ph 2025-07 conditional novelty 5.0 of 10

    First derivation of Z and W helicity density matrix elements in the color-dipole S-matrix framework, with forward-rapidity predictions at 14 TeV linking the Lam-Tung violation to the UGD tail.

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