E2 M1 mixing ratio of Δ→Nγ and hyperon resonance radiative decay

We complete the leading contribution to the E2 M1 mixing ratio of the decay Δ→Nγ in heavy baryon chiral perturbation theory. We find the mixing ratio to be 4%{less-than or approximate}|δ E2 M1|{less-than or approximate}11%, much larger than estimates based on the quark model and other hadronic models. We also compute the mixing ratio for the radiative decay of the hyperon resonances. The decays {logical and with double overbar}^*+→{logical and with double overbar}⁺γ and Ξ^*-→Ξ^-γ provide a particularly sensitive probe of deviations from heavy baryon spin-flavour SU(6). © 1993.

Duke Scholars

Author Roxanne P. Springer Physics