Delta --> N gamma in Large-Nc QCD

E. Jenkins , X. Ji , A.V. Manohar

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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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Delta --> N gamma in Large-Nc QCD

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