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arXiv · 1705.01469

Muon specific two-Higgs-doublet model

Tomohiro Abe·Ryosuke Sato·Kei Yagyu
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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 $\tanβ$, while their couplings to all the other standard model fermions are suppressed by $\cotβ$. Thanks to this coupling property, we can avoid the constraint from leptonic $τ$ decays in contrast to the lepton specific two-Higgs-doublet model, which can explain the muon $g-2$ within the 2$σ$ level but cannot within the $1σ$ level due to this constraint. We find that the model can explain the muon $g-2$ within the 1$σ$ level satisfying constraints from perturbative unitarity, vacuum stability, electroweak precision measurements, and current LHC data.

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Tomohiro Abe, Ryosuke Sato, Kei Yagyu. 2017-05-03. Muon specific two-Higgs-doublet model. https://doi.org/10.1007/jhep07(2017)012

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