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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

On the validity of chiral perturbation theory for weak hyperon decays

Author

  • J. Bijnens
  • H. Sonoda
  • Mark B. Wise

Summary, in English

The predictions of chiral perturbation theory for the weak non-leptonic decays of hyperons are examined beyond the leading order. For the S-wave amplitudes we find that the leading corrections to lowest order chiral perturbation theory preserve the vanishing of the Σ+ → nπ+ amplitude. However, the Lee-Sugawara relation gets a large correction indicating a breakdown of chiral perturbation theory for this relation. For the P-wave amplitudes we find that the leading corrections to lowest order chiral perturbation theory are large indicating a breakdown of chiral perturbation theory for the P-wave amplitudes. The weak semileptonic hyperon decays are determined by baryon matrix elements of the left-handed current. Corrections to the predictions of lowest order chiral perturbation theory for these matrix elements are computed. These corrections are very small.

Publishing year

1985-01-01

Language

English

Pages

185-198

Publication/Series

Nuclear Physics, Section B

Volume

261

Document type

Journal article

Publisher

North-Holland

Status

Published

ISBN/ISSN/Other

  • ISSN: 0550-3213