A Reggeometric (Regge+Geometry) model, based on the observed proportionalitybetween the forward slope of the differential cross section and the interactionradius, the latter depending on virtuality Q2 of the incoming virtual photonand on the mass M 2 of the produced particle, is constructed. The objective ofthis study is the dependence of the Regge-pole amplitude on the virtuality Q2and masses of the external particles, which remains an open problem for thetheory. The present analysis is based on the HERA data on Deeply VirtualCompton Scattering (DVCS) and exclusive diffractive Vector Meson Production(VMP). We treat each class of reactions separately, anticipating a furtherstudy that will include both a soft and a hard component of the unique pomeron.
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