Photoproduction ofπ0Mesons from Hydrogen near Zero Degrees

Abstract

We report measurements of the differential cross section for photoproduction of ir° mesons from hydrogen, with the pion emerging near 0 deg, in the photon energy range 290 to 700 MeV. The results show no unusual behavior of the cross section in the forward direction. They are consistent with the angular distribution characteristic of a magnetic-dipole transition to a P3/2 state. The results agree reasonably well with theoretical predictions of Gourdin and Salin, but disagree with a prediction of DeTollis and Verganelakis. Leastsquares fits in powers of cos0 have been made to the available angular distributions.

One-Particle-Exchange Model in Pion Photoproduction. I

“…I15 do-(,u b/st) The differential cross section for the n°-production resulting from the diagram (3) inFig. 2.…”