Refined analysis of photon leptoproduction off spinless target

Abstract

We calculate the differential cross section for real photon electroproduction off spinless hadron which sevres as a main probe of the hadrons structure via the concept of generalized parton distributions. Compared to previously available computations performed with twist-three power accuracy, we exactly accounted for all kinematical effects in hadron mass and momentum transfer which arise from leptonic helicity amplitudes. We performed numerical studies of these kinematical effects and demonstrated that in the valence quark region and rather low virtualities of the hard photon which sets the factorization scale, the available approximate results significantly overestimate the cross section rates in comparison to exact formulas.

22 pages, 3 figures

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• Deeply Virtual Compton Scattering to the twist-four accuracy: Impact of finite-$t$ and target mass corrections
• Test of two new parameterizations of the Generalized Parton Distribution $H$
• Extraction of Generalized Parton Distribution Observables from Deeply Virtual Electron Proton Scattering Experiments
• Extraction of the Compton Form Factor H from DVCS measurements at Jefferson Lab
• First Exclusive Measurement of Deeply Virtual Compton Scattering off ${}^4$He: Toward the 3D Tomography of Nuclei
• 3D Structure and Nuclear Targets
• An introductory lecture on Generalised Parton Distributions
• Coherent deeply virtual Compton scattering off ${}^4$He
• Higher-Order Kinematical Effects in Deeply Virtual Compton Scattering
• Measurement of deeply virtual Compton scattering off Helium-4 with CLAS at Jefferson Lab
• Radiative effects in the processes of exclusive photon electroproduction from polarized protons
• Accessing GPDs from experiment --- potential of a high-luminosity EIC ---
• Deeply virtual Compton scattering off Helium nuclei with positron beams
• Deeply Virtual Exclusive Processes and Generalized Parton Distributions
• Beam Spin Asymmetry in Electroproduction of Pseudoscalar or Scalar Meson Production off the Scalar Target
• Radiative effects in deep virtual Compton scattering
• Compton scattering: from deeply virtual to quasi-real
• Analysis of virtual meson production in solvable (1+1) dimensional scalar field theory
• Deeply virtual Compton Scattering off ${}^4$He
• New framework for extracting GPDs from exclusive photon electroproduction