2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 6, 85-107
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-$\frac{3}{2}$ 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