A "Vector-like chiral" fourth family to explain muon anomalies

Abstract

The Standard Model (SM) is amended by one generation of quarks and leptons which are vector-like (VL) under the SM gauge group but chiral with respect to a new $\mathrm{U}(1{)}_{3-4}$ gauge symmetry. We show that this model can simultaneously explain the deviation of the muon $g-2$ as well as the observed anomalies in $b\to s{\mu }^{+}{\mu }^{-}$ transitions without conflicting with the data on Higgs decays, lepton flavor violation, or $B_s-{\bar{B}}_s$ mixing. The model is string theory motivated and GUT compatible, i.e. UV complete, and fits the data predicting VL quarks, leptons and a massive $Z^{\prime }$ at the $\mathrm{TeV}$ scale, as well as $\tau \to 3\mu$ and $\tau \to \mu \gamma$ within reach of future experiments. The Higgs couplings to SM generations are automatically aligned in flavor space.

15 pages + Appendix, 4 figures, 4 tables; v2: added references

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