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Chiral perturbation theory for vertical bar Delta I vertical bar=3/2 hyperon decays
Faculty
Not Specified
Year:
1999
Type of Publication:
Article
Pages:
71-89
Authors:
El-Hady, AA, Tandean, J, Valencia, G
DOI:
10.1016/S0375-9474(99)00128-1
Journal:
NUCLEAR PHYSICS A ELSEVIER SCIENCE BV
Volume:
651
Research Area:
Physics
ISSN
ISI:000080840000004
Keywords :
chiral perturbation theory, hyperon non-leptonic decays
Abstract:
We study the \textbackslash{}Delta I\textbackslash{} = 3/2 amplitudes of hyperon non-leptonic decays of the form B -> B-pi' in the context of chiral perturbation theory. The lowest-order predictions are determined in terms of only one unknown parameter and are consistent within errors with current data. We investigate the theoretical uncertainty of these predictions by calculating the leading non-analytic corrections. We also present an estimate for the size of the S-wave Lambda and Xi decays which vanish at leading order. We find that the corrections to the lowest-order predictions are within the expectations of naive power counting and, therefore, that this picture can be tested more accurately with improved measurements. (C) 1999 Elsevier Science B.V. All rights reserved.
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