https://doi.org/10.1140/epja/i2011-11112-6
Regular Article - Theoretical Physics
Transversity in hard exclusive electroproduction of pseudoscalar mesons
1
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980, Moscow region, Russia
2
Fachbereich Physik, Universität Wuppertal, D-42097, Wuppertal, Germany
3
Institut für Theoretische Physik, Universität Regensburg, D-93040, Regensburg, Germany
* e-mail: goloskkv@theor.jinr.ru
** e-mail: kroll@physik.uni-wuppertal.de
Received:
5
July
2011
Revised:
29
August
2011
Accepted:
13
September
2011
Published online:
27
September
2011
Estimates for electroproduction of pseudoscalar mesons at small values of skewness are presented. Cross-sections and asymmetries for these processes are calculated within the handbag approach which is based on factorization in hard parton subprocesses and soft generalized parton distributions (GPDs). The latter are constructed from double distributions. Transversity GPDs are taken into account; they are accompanied by twist-3 meson wave functions. For most pseudoscalar-meson channels a combination of ˜T and 
plays a particularly prominent role. This combination of GPDs, which we constrain by moments obtained from lattice QCD, leads, with the exception of the 
and 
channels, to large transverse cross-sections.
© SIF, Springer-Verlag Berlin Heidelberg, 2011
