Hyperon weak radiative decays in chiral perturbation theory

Details Hyperon weak radiative decays in chiral perturbation theory Hyperon weak radiative decays in chiral perturbation theory

1996-01-19

arxiv.org/abs/hep-ph/9601299v1

Phys.Rev. D54 (1996) 3321-3328

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages of REVTeX and using macro-package "feynman.tex" (available at http://xxx.lanl.gov/ftp/hep-ph/papers/macros) for the 2

Scientific paper

10.1103/PhysRevD.54.3321

We investigate the leading-order amplitudes for weak radiative decays of hyperons in chiral perturbation theory. We consistently include contributions from the next-to-leading order weak-interaction Lagrangian. It is shown that due to these terms Hara's theorem is violated. The data for the decays of charged hyperons can be easily accounted for. However, at this order in the chiral expansion, the four amplitudes for the decays of neutral hyperons satisfy relations which are in disagreement with the data. The asymmetry parameters for all the decays can not be accounted for without higher-order terms. We shortly comment on the effect of the 27-plet part of the weak interaction.

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