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: email@example.com, firstname.lastname@example.org)
Received: 16 December 1997 / Revised version: 18 February 1998 / Published online: 15 June 1998
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.