Transversity in hard exclusive electroproduction of pseudoscalar mesons |
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Authors: | S V Goloskokov P Kroll |
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Institution: | 1.Bogoliubov Laboratory of Theoretical Physics,Joint Institute for Nuclear Research,Moscow region,Russia;2.Fachbereich Physik,Universit?t Wuppertal,Wuppertal,Germany;3.Institut für Theoretische Physik,Universit?t Regensburg,Regensburg,Germany |
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Abstract: | 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 `(E)]T \bar{{E}}_{T}^{} plays a particularly prominent role. This combination of GPDs, which we constrain by moments obtained from lattice QCD, leads,
with the exception of the p+ \pi^{+}_{} and h¢ \eta^{\prime}_{} channels, to large transverse cross-sections. |
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