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Delta --> N gamma in Large-Nc QCD

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arxiv hep-ph/0207092 v1 pith:G4FBSNV2 submitted 2002-07-05 hep-ph

Delta --> N gamma in Large-Nc QCD

classification hep-ph
keywords amplitudesdeltagammaratiodecaydeterminedequivalentlyexpansion
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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