Can $Ω^- \to Ξ^- γ$ be sensitive to new physics beyond the Standard Model ?

Abstract

We investigate the impact of new physics beyond the Standard Model to the $s \rightarrow d γ$ process, which is responsible for the short-distance contribution to the radiative decay $\Otogamma$. 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 $b \to s γ$ transition and the upper limit on $D^0 - \bar{D}^0$ mixing are taken into account, we find no significant contributions of new physics to the $s \to d γ$ process.