Abstract:
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.
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