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We address the question of interpolation of the virtual Compton scatteringprocess off a polarized nucleon target between the deeply virtual regime forthe initial-state photon and its near on-shell kinematics making use of thephoton helicity-dependent Compton Form Factors (CFFs) as a main ingredient ofthe formalism. The five-fold differential cross section for the reaction withall possible polarization options for the lepton and nucleon spins is evaluatedin terms of CFFs in the rest reference frame of the initial-state nucleon. Wesuggest a rather simple parametrization of the Compton hadronic tensor in termsof CFFs which are free from kinematical singularities and are directly related,at large photon virtualities, to Generalized Parton Distributions. We alsoprovide a relation of our basis spanned by a minimal number of Dirac bilinearsto the one introduced by Tarrach for the parametrization of the virtual Comptontensor and utilize the former to establish a set of equalities among our CFFsand Generalized Polarizabilities. As a complementary result, we express Comptonscattering in the Born approximation in terms of CFFs as well.

Compton scattering: from deeply virtual to quasi-real