2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178990The 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^2.4 pagesHigh Energy Physics - Phenomenologytext