Hard Exclusive Electroproduction of Pions

Details Hard Exclusive Electroproduction of Pions Hard Exclusive Electroproduction of Pions

1998-12-21

arxiv.org/abs/hep-ph/9812467v1

Eur.Phys.J.C10:307-312,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages LaTeX

Scientific paper

10.1007/s100529900045

We investigate the exclusive electroproduction of pi^+ mesons from nucleons. To leading twist, leading order alpha_s accuracy the corresponding production amplitude can be decomposed into pseudovector and pseudoscalar parts. Both can be expressed in terms of quark double distribution functions of the nucleon. While the pseudovector contribution is connected to ordinary polarized quark distributions, the pseudoscalar part can be related to one pion t-channel exchange. We observe that the pseudovector part of the production amplitude is important at x < 0.1. On the other hand, for 0.1 < x < 0.4 contributions from one pion exchange dominate.

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