Delta --> N gamma in Large-Nc QCD
Abstract
The decay Delta+ --> p gamma is studied in the 1/Nc expansion of QCD. The ratio of the helicity amplitudes is determined to be A3/2/A1/2 = 3 + O(1/Nc2). Equivalently, the ratio E2/M1 of the multipole amplitudes is predicted to be order 1/Nc2.
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