Abstract
The helicity components σ1/2 and σ3/2 of the cross section for double charged-pion production by real photons on a nucleon are calculated within a phenomenological approach developed previously. A high sensitivity of the σ1/2–σ3/2 asymmetry to the contribution of nucleon resonances having strongly different electromagnetic helicity amplitudes A1/2 and A3/2 is demonstrated. This feature is of importance for seeking “missing” baryon states.
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