Radiative Ω-→Ξ-γ decay and physics beyond the standard model

We investigate the impact of new physics beyond the standard model to the s→dγ process, which is responsible for the short-distance contribution to the radiative decay Ω-→Ξ-γ. We study three representative extensions of the standard model: namely, a one-family technicolor model, a two-Higgs-doublet model, and a model containing scalar leptoquarks. When constraints arising from the observed b→sγ transition and the upper limit on D0-bar D0 mixing are taken into account, we find no significant contributions of new physics to the s→dγ process. copyright 1996 The American Physical Society