Constraints on flavor-changing Z' models by B_s mixing, Z' production, and B_s -> μ^+ μ^-

Abstract

Certain string-inspired Z' models have non-universal interactions to three families of fermions and induced tree-level flavor-changing couplings. We use recent results on B_s-anti-B_s mixing to constrain the size of the flavor-changing couplings in the b-s sector. In some highly predictive Z' models, such a constraint on b-s coupling can be translated into the flavor-diagonal couplings. Based on the Z' production limits at the Tevatron, we obtain the limit on the leptonic couplings of Z' and then make predictions for B_s -> μ^+ μ^- branching ratios. We conclude that with the present constraints from B_s mixing and Z' production, the muonic decay of $B_s$ may not be observed at the Tevatron if the projected integrated luminosity is less than O(5-10) fb.

arXiv comment5 pages, 4 figures

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• Probing Leptonic Interactions of a Family-Nonuniversal Z' Boson
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• A Comprehensive Analysis of Hadronic b->s Transitions in a Family Non-universal Z' Model
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• Search for Top Quark FCNC Couplings in Z' Models at the LHC and CLIC
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• Flavorful $Z^{\prime }$ signatures at LHC and ILC
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• B/s0 anti-B/s0 mixing in the MSSM with large tan beta
• Imprints of CP violation asymmetries in rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in family non-universal $Z^{\prime }$ model
• Study of the rare decays $B_{(}s,d{)}^{\ast }$ arrow $l^{+}{l}^{-}$ in Z' model
• LHCb anomaly in $\mathbf{B}\to {\mathbf{K}}^{\ast }{\mathbf{\mu }}^{+}{\mathbf{\mu }}^{-}$ optimised observables and potential of ${\mathbf{Z}}^{\prime }$ Model
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• Implication of the Fourth Generation Standard Model to the Lepton Polarization asymmetries in the $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ Decay
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