Resonances in radiative hyperon decays

Details Resonances in radiative hyperon decays Resonances in radiative hyperon decays

1999-02-22

arxiv.org/abs/hep-ph/9902431v1

Phys.Rev. D59 (1999) 054019

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 2 figures

Scientific paper

10.1103/PhysRevD.59.054019

The importance of resonances for the radiative hyperon decays is examined in the framework of chiral perturbation theory. Low lying baryon resonances are included into the effective theory and tree contributions to these decays are calculated. We find significant contributions to both the parity-conserving and parity-violating decay amplitudes and a large negative value for the asymmetry parameter in polarized Sigma^+ -> p gamma is found, in agreement with the experimental result alpha(p Sigma^+) = -0.76 +/- 0.08.

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