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Delta --> N gamma in Large-Nc QCD
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Delta --> N gamma in Large-Nc QCD
classification
hep-ph
keywords
amplitudesdeltagammaratiodecaydeterminedequivalentlyexpansion
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The decay Delta^+ --> p gamma is studied in the 1/N_c expansion of QCD. The ratio of the helicity amplitudes is determined to be A_{3/2}/A_{1/2} = \sqrt{3} + O(1/N_c^2). Equivalently, the ratio E2/M1 of the multipole amplitudes is predicted to be order 1/N_c^2.
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