Muon specific two-Higgs-doublet model

Abstract

We investigate a new type of a two-Higgs-doublet model as a solution of the muon $g-2$ anomaly. We impose a softly-broken $Z_4$ symmetry to forbid tree level flavor changing neutral currents in a natural way. This $Z_4$ symmetry restricts the structure of Yukawa couplings. As a result, extra Higgs boson couplings to muons are enhanced by a factor of $\tan \beta$, while their couplings to all the other standard model fermions are suppressed by $\cot \beta$. Thanks to this coupling property, we can avoid the constraint from leptonic $\tau$ decays in contrast to the lepton specific two-Higgs-doublet model, which can explain the muon $g-2$ within the 2$\sigma$ level but cannot within the $1\sigma$ level due to this constraint. We find that the model can explain the muon $g-2$ within the 1$\sigma$ level satisfying constraints from perturbative unitarity, vacuum stability, electroweak precision measurements, and current LHC data.

24 pages, 3 figures

References in corpus (3)

• PYTHIA 6.4 Physics and Manual
• Limiting two-Higgs-doublet models
• A light pseudoscalar of 2HDM confronted with muon g-2 and experimental constraints

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