On the validity of chiral perturbation theory for weak hyperon decays

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.

• Author: J. Bijnens; H. Sonoda; Mark B. Wise
• Publishing year: 1985-01-01
• Language: English
• Pages: 185-198
• Publication/Series: Nuclear Physics, Section B
• Volume: 261
• Links: http://dx.doi.org/10.1016/0550-3213(85)90569-3
• Document type: Journal article
• Publisher: North-Holland
• Status: Published
• ISBN/ISSN/Other: ISSN: 0550-3213