LHCb anomaly and $B$ physics in flavored Z${}^{\prime }$ models with flavored Higgs doublets

Abstract

We study an extended Standard Model with a gauged U(1)${}^{\prime }$ flavor symmetry, motivated not only by the fermion mass hierarchy but also by the excesses in $B\to K^{(\ast )}ll$ reported by the LHCb collaborations. The U(1)${}^{\prime }$ charges are assigned to quarks and leptons in a flavor-dependent manner, and flavored Higgs doublets are also introduced in order to detail the Yukawa couplings at the renormalizable level. Then, the fermion mass hierarchy is realized by the vacuum alignment of the Higgs doublets. In this model, flavor-changing currents involving the gauge boson of U(1)${}^{\prime }$ and the scalars generated by the Higgs doublets are predicted and the observables in the $B\to K^{(\ast )}ll$ process possibly deviate from the Standard Model predictions. We study the possibility that these new flavor-changing interactions can explain the excesses in the $B\to K^{(\ast )}ll$ process, and we derive some predictions for the other flavor-violating processes based on the analysis. We specifically investigate the $\Delta F=2$ processes and the other $B$ decays: e.g., $B\to X_s\gamma$ and $B\to D^{(\ast )}\tau \nu$, where the deviations are reported by the Belle and $BABAR$ collaborations.

28 pages, 5 figures, v2: texts and figures are improved

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Cited by in corpus (61)

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• Gauging the accidental symmetries of the Standard Model, and implications for the flavour anomalies
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• Searches for lepton-flavour-violating decays of the Higgs boson into $e\tau$ and $\mu \tau$ in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Global Fits of Third Family Hypercharge Models to Neutral Current B-Anomalies and Electroweak Precision Observables
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• Flavor physics in the multi-Higgs doublet models induced by the left-right symmetry
• Large Hadron Collider Constraints on Some Simple $Z^{\prime }$ Models for $b\to s{\mu }^{+}{\mu }^{-}$ Anomalies
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• Rare nonleptonic ${\bar{B}}_s^0$ decays as probes of new physics behind $b\to s\mu \bar{\mu }$ anomalies
• Hide and Seek with the Third Family Hypercharge Model's $Z^{\prime }$ at the Large Hadron Collider
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• Higgs flavor phenomenology in a supersymmetric left-right model with parity
• Decay $B_c^{+}\to D_{(s)}^{(\ast )+}{\ell }^{+}{\ell }^{-}$ within covariant confined quark model