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We calculate the differential cross section for real photon electroproductionoff spinless hadron which sevres as a main probe of the hadrons structure viathe concept of generalized parton distributions. Compared to previouslyavailable computations performed with twist-three power accuracy, we exactlyaccounted for all kinematical effects in hadron mass and momentum transferwhich arise from leptonic helicity amplitudes. We performed numerical studiesof these kinematical effects and demonstrated that in the valence quark regionand rather low virtualities of the hard photon which sets the factorizationscale, the available approximate results significantly overestimate the crosssection rates in comparison to exact formulas.

Refined analysis of photon leptoproduction off spinless target