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

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

1994-03-25

arxiv.org/abs/hep-ph/9403361v2

Phys.Rev.Lett.73:939-942,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

Plain Tex, 9 pages, 3 appended figures, SLAC-PUB-6464-revised

Scientific paper

10.1103/PhysRevLett.73.939

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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