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Two approaches for analysis of pion photo- and electroproduction on nucleonsin the resonance energy region are checked at $Q^2=0$ using the results ofGWU(VPI) partial-wave analysis of photoproduction data. The approaches arebased on dispersion relations and unitary isobar model. Within dispersionrelations good description of photoproduction multipoles is obtained up to$W=1.8 GeV$. Within unitary isobar model, modified with increasing energy byincorporation of Regge poles, and with unified Breit-Wigner parametrization ofresonance contributions, good description of photoproduction multipoles isobtained up to $W=2 GeV$.Comment: 23 pages, LaTe

physical review. c. nuclear physics/physical review. c, nuclear physics

Multipole amplitudes of pion photoproduction on nucleons up to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi /><mml:mi mathvariant="normal">GeV</mml:mi></mml:math>using dispersion relations and the unitary isobar model

Multipole amplitudes of pion photoproduction on nucleons up to2GeVusing dispersion relations and the unitary isobar model