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Published November 25, 1967 | public
Journal Article Open

Small-Angle Photoproduction and Conspiracy


In any reaction of the class π+B→V+B, or V+B→π+B, nonconspiring amplitudes with a meson helicity change (hV-hπ≠0) exhibit a dip at small angles. Normally, this would simply mean that the zero-helicity-change amplitude dominates forward production. But in photoproduction, since the photon has no longitudinal component, there is no zero-helicity-change amplitude, and in the absence of conspiracy a forward dip will appear in the differential cross section. When conspiracy is present, the dip does not appear. Thus, forward photoproduction provides a good test for conspiracy.

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©1967 The American Physical Society. Received 26 June 1967. It is a pleasure to acknowledge a number of helpful discussions with Dr. David Horn. Work supported in part by the U.S. Atomic Energy Commission. Prepared under Contract AT(11-1)-68 for the San Francisco Operations Office, U.S. Atomic Energy Commission. [S.F. was a] Alfred P. Sloan Foundation Fellow. [L.J. was a] National Science Foundation Predoctoral Fellow.


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