b -> s Decays in a model with Z-mediated flavor changing neutral current

Abstract

In the scenario with Z mediated flavor changing neutral current occurring at the tree level due to the addition of a vector-like isosinglet down-type quark d' to the SM particle spectrum, we perform a chi square fit using the flavor physics data and obtain the best fit value along with errors of the tree level Zbs coupling, U_{sb}. The fit indicates that the new physics coupling is constrained to be small: we obtain |U_{sb}| <= 3.40 X 10^{-4} at 3 sigma. Still this does allow for the possibility of new physics signals in some of the observables such as semileptonic CP asymmetry in Bs decays.

9 pages, no figures

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Cited by in corpus (6)

• New-physics signals of a model with a vector-singlet up-type quark
• Flavor signatures of isosinglet vector-like down quark model
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
• New signals for vector-like down-type quark in $U(1)$ of $E_6$
• Mixing asymmetries in B meson systems, the D0 like-sign dimuon asymmetry and generic New Physics
• The third family quark mass hierarchy and FCNC in the universal seesaw model