E2/M1 Mixing Ratio of $Δ\to Nγ$ and Hyperon Resonance Radiative Decay

Details E2/M1 Mixing Ratio of $Δ\to Nγ$ and Hyperon Resonance Radiative Decay E2/M1 Mixing Ratio of $Δ\to Nγ$ and Hyperon Resonance Radiative Decay

1993-02-03

arxiv.org/abs/hep-ph/9302214v1

Phys.Lett. B304 (1993) 353-358

Physics

High Energy Physics

High Energy Physics - Phenomenology

Uses harvmac.tex. 9 pages with 2 PostScript figures, packed and included using uufiles and figure. UCSD/PTH 93-04, QUSTH-93-01

Scientific paper

10.1016/0370-2693(93)90308-5

We compute the leading contribution to the E2/M1 mixing ratio of the decay $\Delta\rightarrow N\gamma$ in heavy baryon chiral perturbation theory. We find the mixing ratio to be $4\% \ltap |\delta_{\rm E2/M1}| \ltap 11\%$, 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 $\Sigma^{*+}\rightarrow\Sigma^+\gamma$ and $\Xi^{*-}\rightarrow\Xi^-\gamma$ provide a particularly sensitive probe of deviations from heavy baryon spin-flavour SU(6).

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