General Analysis of the Reaction e^+ + e^- → N + Ñ + π^0

The general analysis of the reaction , in case longitudinally polarized electron beam, has been performed one-photon-nnihilation approximation, accounting for polarization states final nucleon. This is useful description continuum (non-resonant) and resonant (with different possible vector mesons or excited baryons intermediate virtual Feynman diagrams) contributions. conservation hadron electromagnetic currents P-invariance interaction were used to express matrix element terms six complex independent invariant amplitudes. structure hadronic tensor unpolarized hadrons nucleon derived. spin-independent part determined by five functions spin-dependent one 13 functions. transversal, longitudinal normal components four-vector are expressed means four-vectors particle momenta. variables which describe have introduced. limits changing these considered. kinematical double regions given figure. kinematics, suitable study mass distributions, investigated.