Implications of the non-universal Z boson in FCNC mediated rare decays

Abstract

We analyze the effect of the non-universal $Z$ boson in the rare decays $B_s\to l^{+}{l}^{-}$, $B_s\to l^{+}{l}^{-}\gamma$ and $Z\to b\bar{s}$ decays. These decays involve the FCNC mediated $b\to s$ transitions, and are found to be very small in the standard model. The smallness of these decays in the standard model makes them sensitive probe for new physics. We find an enhancement of at least an order in these branching ratios because of the non-universal $Zbs$ coupling.

arXiv comment15 pages, 4 figures, minor changes in the text, references added, to appear in PRD

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• Higgs and Z-boson FCNC decays correlated with B-meson decays in littlest Higgs model with T-parity
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
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• Effect of FCNC mediated Z boson on lepton flavor violating decays
• $B_s^0-{\bar{B}}_s^0$ mixing and $b\to s$ transitions in isosinglet down quark model
• Signature of new physics in B -> phi pi decay
• Study of the rare decays $B_{(}s,d{)}^{\ast }$ arrow $l^{+}{l}^{-}$ in Z' model
• Light axigluon and single top production at the LHC
• Effect of both Z and Z^prime - mediated flavor-changing neutral currents on $B_s$ decays into $ta{u}^{+}ta{u}^{-}$
• New physics in $\text{b}\to \text{s}$ transitions in the MF331 model
• Implication of Z-mediated FCNC on semileptonic decays $B_s\to \varphi l^{+}{l}^{-}$ and $B^{+}\to K^{+}{l}^{+}{l}^{-}$
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• Questions of flavor physics and neutrino mass from a flipped hypercharge
• Flavor phenomenology of an extended 2HDM with inverse seesaw mechanism
• $CP$ violation in the $HZZ$ vertex and left-right asymmetries
• Inspection of new physics in ${\mathrm{B}}_{\mathrm{s}}^0\to {\mathrm{K}}^{+}{\mathrm{K}}^{-}$ decay mode
• Study of $B_s^0\to l^{+}{l}^{-}\gamma$ decays in the nonuniversal Z' model