Delta --> N gamma in Large-Nc QCD

Details Delta --> N gamma in Large-Nc QCD Delta --> N gamma in Large-Nc QCD

2002-07-05

arxiv.org/abs/hep-ph/0207092v1

Phys.Rev.Lett.89:242001,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages

Scientific paper

10.1103/PhysRevLett.89.242001

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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