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

Preprint

25 March 1994

preprint
Published by arXiv in arXiv

Abstract

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.

Keywords

DISTRIBUTION AMPLITUDE
ANGULAR DISTRIBUTION
PION DISTRIBUTION
BOUND STATE
YAN PROCESS
DRELL YAN
TWIST
QCD

All Related Versions

Version 1, 1994-03-25, ArXiv
Version 2, 1994-06-04, ArXiv
Published version: Physical Review Letters, 73 (7), 939.

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