Delta --> N gamma in Large-Nc QCD

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

Delta --> N gamma in Large-Nc QCD

Authors

Jenkins, E.

Ji, X.

Manohar, A. V.

Description

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.
4 pages