Ansatz for small FCNC with a non-universal $Z^{\prime }$

Abstract

It is well known that a non-universal $Z^{\prime }$ induces tree-level FCNC which are severely constrained by experiment, most notably meson mixing. We point out that there is a class of models, with a down-quark mass matrix of the Georgi-Jarlskog form, in which the FCNC in the down-type quark sector vanish or are strongly suppressed. The largest FCNC in these models would occur in the $tc$ transition with a strength comparable to $V_{ts}$.

arXiv comment8 pages. Several typos corrected. Version accepted by Phys. Lett. B

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• B_s^0-\bar{B}_s^0 mixing and B -> πK decays in stringy leptophobic Z^\prime
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• D0 Dimuon Asymmetry in $B_s-{\bar{B}}_s$ Mixing and Constraints on New Physics
• A Theory for Maximal Flavor Violation
• The Family SU(2)_l x SU(2)_h x U(1) Model
• CP phase of nonuniversal $Z^{\prime }$ on $\sin {\varphi }_s^{J/\Psi \varphi }$ and T-odd observables of ${\bar{B}}_q\to V_q{\ell }^{+}{\ell }^{-}$
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
• Constraints on new physics from $K\to \pi \nu \bar{\nu }$
• Flavor changing Z' couplings at the LHC
• Yukawa sector for LFV in $h\to \mu \tau$ and CP violation in $h\to \tau \tau$
• Effects of Family Nonuniversal Z' Boson on Leptonic Decays of Higgs and Weak Bosons
• Phenomenological Implications of Supersymmetric Family Non-universal U(1)-prime Models
• Model Independent Predictions for Rare Top Decays with Weak Coupling
• Same-sign top pair plus $W$ production in flavor changing vector and scalar models
• LHC constraints on $W^{\prime },Z^{\prime }$ that couple mainly to third generation fermions
• Leptonic number violation signature arising from a $Z^{\prime }$ model with non-diagonal leptonic couplings