Abstract
We discuss a mechanism where charged lepton masses are derived from one-loop diagrams mediated by particles in a dark sector including a dark matter candidate. We focus on a scenario where the muon and electron masses are generated at one loop with new $\mathcal{O}(1)$ Yukawa couplings. The measured muon anomalous magnetic dipole moment, $(g\ensuremath{-}2{)}_{\ensuremath{\mu}}$, can be explained in this framework. As an important prediction, the muon and electron Yukawa couplings can deviate significantly from their standard model predictions, and such deviations can be tested at High-Luminosity LHC and future ${e}^{+}{e}^{\ensuremath{-}}$ colliders.
Highlights
After the discovery of 125-GeV Higgs boson, direct evidence for the existence of the bottom [1,2] and tau [3,4] Yukawa couplings has been found at the LHC
We discuss a mechanism where charged lepton masses are derived from one-loop diagrams mediated by particles in a dark sector including a dark matter candidate
We focus on a scenario where the muon and electron masses are generated at one loop with new Oð1Þ Yukawa couplings
Summary
After the discovery of 125-GeV Higgs boson, direct evidence for the existence of the bottom [1,2] and tau [3,4] Yukawa couplings has been found at the LHC. Two vectorlike fermions Fe and Fμ are separately introduced for the one-loop electron and muon masses without inducing dangerous LFV processes In this table, IF;L;R and YF;L;R are respectively the weak isospins and the hypercharges for the new particles. Both mass and g − 2 for the muon/electron are proportional to μflLflR. This result indicates that the electron mass can be reproduced by having Me 1⁄4 Oð1Þ TeV and a smaller coupling product feLfeR sin 2θ 1⁄4 me=mμ ≃ 1=200, in which case our original motivation to naturally explain the tiny mass would be lost
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