Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

On the validity of chiral perturbation theory for weak hyperon decays

Bijnens, J. LU orcid ; Sonoda, H. and Wise, Mark B. (1985) In Nuclear Physics, Section B 261. p.185-198
Abstract

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.... (More)

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.

(Less)
Please use this url to cite or link to this publication:
author
; and
publishing date
type
Contribution to journal
publication status
published
in
Nuclear Physics, Section B
volume
261
pages
14 pages
publisher
Elsevier
external identifiers
  • scopus:0000491740
ISSN
0550-3213
DOI
10.1016/0550-3213(85)90569-3
language
English
LU publication?
no
id
bd8ad1f5-b7ea-4610-b04e-7793703a1a4e
date added to LUP
2019-05-03 09:21:42
date last changed
2025-10-14 08:56:42
@article{bd8ad1f5-b7ea-4610-b04e-7793703a1a4e,
  abstract     = {{<p>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<sup>+</sup> → nπ<sup>+</sup> 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.</p>}},
  author       = {{Bijnens, J. and Sonoda, H. and Wise, Mark B.}},
  issn         = {{0550-3213}},
  language     = {{eng}},
  month        = {{01}},
  pages        = {{185--198}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Physics, Section B}},
  title        = {{On the validity of chiral perturbation theory for weak hyperon decays}},
  url          = {{http://dx.doi.org/10.1016/0550-3213(85)90569-3}},
  doi          = {{10.1016/0550-3213(85)90569-3}},
  volume       = {{261}},
  year         = {{1985}},
}