New Physics and Short-Distance s->d gamma Transition in Omega^- -> Cascade^- gamma Decay

Abstract

We study the contributions of physics beyond the standard model to the short-distance s->d gamma transition in Omega^- -> Cascade^- gamma decay. We explore the possibility that the new interactions remove the chirality suppression which occurs in the standard-model contribution to s->d gamma and enhance the effect of this coupling by factors of a heavy-mass scale relative to the s-quark mass. We consider two of the popular models for new physics, and, after taking into account constraints from other processes, find that their contributions can be larger than that of the standard model by up to a few times, which suggests that the yet unobserved Omega^- -> Cascade^- gamma decay is a likely probe for new physics.

9 pages, latex, few minor changes and additions, to appear in Phys. Rev. D

References in corpus (2)

• Supersymmetric contributions to direct CP violation in K -> pi pi gamma decays
• Constraints on $s\to d\gamma$ from Radiative Hyperon and Kaon Decays

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• New Physics and CP Violation in Hyperon Nonleptonic Decays
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• Probing CP Violation in Omega->Lambda K->p pi K Decay
• Production and decay of polarized hyperon-antihyperon pairs
• Reanalysis of CP Violation in K_L -> pi^+ pi^- gamma
• Measurement of the Decay ${\Xi }^0\to \Lambda \gamma$ with Entangled ${\Xi }^0{\bar{\Xi }}^0$ Pairs
• ${\Sigma }^{+}\to p{\ell }^{+}{\ell }^{-}$ decays within the standard model and beyond
• Lepton pair decays of the $K_L$ meson in the light-front model