Addressing the LHC flavour anomalies with horizontal gauge symmetries

Abstract

We study the impact of an additional $U(1{)}^{\prime }$ gauge symmetry with flavour-dependent charges for quarks and leptons on the LHC flavour anomalies observed in $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$, $R(K)=B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$, and $h\to \mu \tau$. In its minimal version with two scalar doublets, the resulting model naturally explains the deviations from the Standard Model observed in $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $R(K)$. The CMS access in $h\to \mu \tau$ can be explained by introducing a third scalar doublet, which gives rise to a prediction for $\tau \to 3\mu$. We investigate constraints from flavour observables and direct LHC searches for $pp\to Z^{\prime }\to {\mu }^{+}{\mu }^{-}$. Our model successfully generates the measured fermion-mixing matrices and does not require vector-like fermions, unlike previous attempts to explain these anomalies.

14 pages, 6 figures. Added references; matches published version

References in corpus (14)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Angular Distributions of B -> K ll Decays
• $R_K$ and future $b\to s\ell \ell$ BSM opportunities
• Vanishing Minors in the Neutrino Mass Matrix from Abelian Gauge Symmetries
• Constraints on new physics from the quark mixing unitarity triangle
• Zero minors of the neutrino mass matrix
• Constraints on flavor-changing Z' models by B_s mixing, Z' production, and B_s -> μ^+ μ^-
• Exploring Two Higgs Doublet Models Through Higgs Production
• Family Non-universal $U(1{)}^{\prime }$ Gauge Symmetries and $b\to s$ Transitions
• Leptophilic Dark Matter with $Z^{\prime }$ interactions
• Comprehensive Analysis on Lepton Flavor Violating Higgs Boson to mu tau Decay in Supersymmetry without R Parity
• Higgs to mu tau Decay in Supersymmetry without R Parity
• Neutrino Hierarchies from a Gauge Symmetry

Cited by in corpus (2)

• Implications of $b\to s$ measurements
• Explaining the LHC flavour anomalies