Author: Jusak Tandean
Title: |Delta I|=3/2 Decays of Hyperons in Chiral Perturbation Theory
Abstract: We study the |Delta I|=3/2 amplitudes of the octet-hyperon decays B -> B' + pion and of the decays Omega^- -> Cascade + pion in the context of heavy-baryon chiral perturbation theory. For the octet-hyperon decays, we investigate the theoretical uncertainty of the lowest-order predictions by calculating the leading non-analytic corrections. We find that these corrections are within the expectations of naive power counting and, therefore, that this picture can be tested more accurately with improved measurements.For the Omega- decays, we obtain at leading order two operators responsible for the decays which also contribute at one loop to the octet-hyperon decays. These one-loop contributions are sufficiently large to suggest thatthe ratio of measured widths of Omega^- -> Cascade0 + pion- to Omega^- -> Cascade- + pion0 being approximately equal to 2.7 may be too large.