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We estimate the leading order amplitudes for exclusive photon and mesonelectroproduction reactions at large Q^2 in the valence region in terms ofskewed quark distributions. As experimental investigations can currently onlybe envisaged at moderate values of Q^2, we estimate power corrections due tothe intrinsic transverse momentum of the partons in the meson wavefunction andin the nucleon. To this aim the skewed parton distribution formalism isgeneralized so as to include the parton intrinsic transverse momentumdependence. Furthermore, for the meson electroproduction reactions, wecalculate the soft overlap type contributions and compare with the leadingorder amplitudes. We give first estimates for these different power correctionsin kinematics which are relevant for experiments in the near future.Comment: 59 pages, 21 figure

Deeply virtual electroproduction of photons and mesons on the nucleon: Leading order amplitudes and power corrections