https://doi.org/10.1140/epjc/s10052-009-1178-9
Regular Article - Theoretical Physics
An attempt to understand exclusive π + electroproduction
1
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, 141980, Moscow region, Russia
2
Fachbereich Physik, Universität Wuppertal, 42097, Wuppertal, Germany
3
Institut für Theoretische Physik, Universität Regensburg, 93040, Regensburg, Germany
* e-mail: kroll@physik.uni-wuppertal.de
Received:
17
June
2009
Revised:
6
September
2009
Published online:
11
November
2009
Hard exclusive π + electroproduction is investigated within the handbag approach. The prominent role of the pion-pole contribution is demonstrated. It is also shown that the experimental data require a twist-3 effect which ensues from the helicity-flip generalized parton distribution H T and the twist-3 pion wave function. The results calculated from this handbag approach are compared in detail with the experimental data on cross sections and spin asymmetries measured with a polarized target. It is also commented on consequences of this approach for exclusive π 0 and vector-meson electroproduction.
© Springer-Verlag , 2010
