Abstract
An absolute prediction for the photoproduction of pions on protons is given in the region of the first pion nucleon resonance. The imaginary part of the amplitude was approximated by the resonant magnetic dipole amplitudeM 1+ 3/2 taken from the theory of CGLN. With this approximation the real part of the amplitude was calculated by means of fixedt dispersion relations and discussed in terms of multipoles.π +-andπ 0-excitation curves atΘ=90° for unpolarized as well as plane-polarizedγ's are compared with the experiments. In the appendix we give tables of the differential cross sections in the c.m. system.
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