DOI 10.1007/s1005298000896
Non-leptonic hyperon decays in chiral perturbation theory
B. Borasoy - Barry R. Holstein
Department of Physics and Astronomy, University of Massachusetts,
Amherst, MA 01003, USA
(e-mail: borasoy@phast.umass.edu, holstein@phast.umass.edu)
Received: 16 December 1997 / Revised version: 18 February 1998 / Published online: 15 June 1998
Abstract
The non-leptonic hyperon decays are analyzed up to one-loop order
including all counterterms in the framework of heavy baryon
chiral perturbation theory. We use the exchange of the spin-
decuplet resonances as an indication of which low-energy constants
contribute significantly to these investigated processes.
We choose four independent
decay amplitudes that are not related by isospin relations
in order to perform a fit for the pertinent low-energy constants
and find a satisfactory fit both for s- and p-waves.
The chiral corrections to the lowest order forms
for the s-waves are moderate whereas there are significant
modifications of the p-wave amplitudes.
Copyright Springer-Verlag
