Evidence for Vector-Meson Effects onπ0Photoproduction From Hydrogen

Abstract

Angular distributions from the reaction gamma + p yields p + pi / sup 0/ were measured in an attempt to isolate the contribution of the virtual exchange of one neutral vector meson. The experimental apparatus and procedure are described, and measured and calculated data are presented. It is found that above the third pion-nucleon resonance such a pole process becomes important. Two hypotheses are advanced as to which vector mesons are contributing, and the data are discussed in respect to these hypotheses. The relevant coupling constants are calculated from the data, and their accuracy is discussed. (H.D.R.) has a full width of 20 Mev. The effect also may possibly be

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