Abstract
The angular distribution for the production of pairs of pions by photons or pions incident on nucleons is analyzed in terms of the various angular momentum states involved. A general expression is derived and then the effect of various assumptions about which states should be important is examined. It is found that an examination of the relative azimuth of the pions should give information about the nature of the process, and in particular about the existence of a resonant state of the nucleon, and its angular momentum.

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