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Vector-like Leptons: Muon g-2 Anomaly, Lepton Flavor Violation, Higgs Decays, and Lepton Non-Universality
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abstract
In this paper, we consider the Standard Model (SM) with one family of vector-like (VL) leptons, which couple to all three families of the SM leptons. We study the constraints on this model coming from the heavy charged lepton mass bound, electroweak precision data, the muon anomalous magnetic moment, lepton flavor violation, Higgs decay constraints and a recently measured lepton non-universality observable, $R_{K^{*0}}$. We find that the strongest constraints are coming from the muon $g-2, \ R_{\mu\mu}=\Gamma(h\to\mu\mu)/\Gamma(h\to\mu\mu)_\text{SM}, \ R_{\gamma\gamma}$ and $\text{BR}(\mu\to e\gamma)$. Although VL leptons couple to all three families of the SM leptons, the ratio of electron-VL to muon-VL coupling is constrained to be $\langle\lambda_e/\lambda_\mu\rangle\lesssim10^{-4}$. We also find that our model cannot fit the observed value of $R_{K^{*0}}$.
Forward citations
Cited by 3 Pith papers
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Implications of portal vector-like lepton on associated Higgs production at a multi-TeV muon collider
At a future muon collider, Higgs production with an invisible dark photon could outshine Higgs+Z by 1–100 times in a vector-like-lepton portal model, giving a kinetic-mixing-independent dark photon probe.
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The Two Scales of New Physics in Loop-Induced Higgs Couplings
A deviation in the loop-induced Higgs couplings hgg, hγγ, or hZγ caused solely by new vectorlike fermions implies an upper bound on the mass scale of new bosons needed to restore perturbativity and vacuum stability.
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Vectorlike $\tau$ production through leptoquarks
Leptoquark decays can dominate the production of heavy vectorlike tau partners at the LHC, offering new mono- and di-lepton search channels.
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