Vectorlike leptons: Muon 
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 anomaly, lepton flavor violation, Higgs boson decays, and lepton nonuniversality

Poh, Zijie; Raby, Stuart

doi:10.1103/physrevd.96.015032

Cited by 59 publications

(34 citation statements)

References 19 publications

(29 reference statements)

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“…Models with VL leptons mixing to the SM families often affect the LFV Higgs boson decays such as h → µτ , and also changes in the rates of lepton flavor conserving decays, see e.g. [39,45,98]. However, in the generic parameter regions of our best fit points, there is no significant contribution from the mixing to these processes.…”

Section: Lepton Flavor Physicsmentioning

confidence: 71%

Complete vectorlike fourth family and new U(1)′ for muon anomalies

2019

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We consider the Standard Model (SM) with the addition of a U(1) gauge symmetry and a complete fourth family of quarks and leptons which are vector-like with respect to the full SU(3) C × SU(2) L × U(1) Y × U(1) gauge symmetry. The model provides a unified explanation of experimental anomalies in (g − 2) µ as well as b → s + − decays. We find good fits to the deviations from the SM, while at the same time fitting all other SM observables. The model includes a new Z gauge boson, a U(1) -breaking scalar, and vector-like leptons all with mass of order a few 100 GeV. It is consistent with all currently released high energy experimental data, however, it appears imminently testable with well designed future searches. Also precision flavor experiments, especially more accurate direct determinations of CKM matrix elements, would allow to probe the best fit points.

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Section: Lepton Flavor Physicsmentioning

confidence: 71%

Complete vectorlike fourth family and new U(1)′ for muon anomalies

2019

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“…With respect to Ref. [103,104], also aiming at an explanation of the b → s + − anomalies, we add not only a 4 th generation of leptons but also of quarks [105][106][107][108] There, we also provide completely general expressions for the formulae of the relevant Wilson coefficients. We review the corresponding observables together with the current experimental situation in Sec.…”

Section: Contentsmentioning

confidence: 99%

“…The Lagrangian for our 4 th generation model is obtained from the SM one by adding a 4 th vector-like generation [103,104] and a neutral scalar…”

Section: Lagrangianmentioning

confidence: 99%

Generic loop effects of new scalars and fermions in b → sℓ+ℓ− and a vector-like 4th generation

Arnan¹,

Crivellin²,

Fedele³

et al. 2019

J. High Energ. Phys.

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In this article we investigate in detail the possibility of accounting for the b → s + − anomalies via box contributions involving with new scalars and fermions. For this purpose, we first write down the most general Lagrangian which can generate the desired effects and then calculate the generic expressions for all relevant b → s Wilson coefficients. Here we extend previous analysis by allowing that the new particles can also couple to right-handed Standard Model (SM) fermions as preferred by recent b → s + − data and the anomalous magnetic moment of the muon. In the second part of this article we illustrate this generic approach for a UV complete model in which we supplement the Standard Model by a 4 th generation of vector-like fermions and a real scalar field. This model allows one to coherently address the observed anomalies in b → s + − transitions and in a µ without violating the bounds from other observables (in particular B s −B s mixing) or LHC searches. In fact, we find that our global fit to this model, after the recent experimental updates, is very good and prefers couplings to right-handed SM fermions, showing the importance of our generic setup and calculation performed in the first part of the article.

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“…For instance, LFV Higgs boson decays are predicted in models with VL leptons studied in Refs. [4,20,42]. All observables here are calculated at tree-level, except for h → γγ.…”

Section: Ew Bosonsmentioning

confidence: 99%

Complete vectorlike fourth family with U(1)′ : A global analysis

2020

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In this paper we present an in-depth analysis of a recently proposed Standard Model extension with a complete fourth generation of quarks and leptons, which are vector-like with respect to the Standard Model gauge group and charged under a new spontaneously broken vector-like U(1) gauge symmetry. The model is designed to explain the known muon anomalies, i.e. the observed deviations from Standard Model predictions in the anomalous magnetic moment of the muon, ∆a µ , and in b → s + − processes. We perform a global χ 2 analysis of the data with 65 model parameters and including 98 observables. We find many points with χ 2 per degree of freedom ≤ 1. The vector-like leptons and the new heavy Z are typically much lighter than a TeV and would, thus, be eminently visible at the HL-LHC.

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Vectorlike leptons: Muon g−2 anomaly, lepton flavor violation, Higgs boson decays, and lepton nonuniversality

Cited by 59 publications

References 19 publications

Complete vectorlike fourth family and new U(1)′ for muon anomalies

Complete vectorlike fourth family and new U(1)′ for muon anomalies

Generic loop effects of new scalars and fermions in b → sℓ+ℓ− and a vector-like 4th generation

Complete vectorlike fourth family with U(1)′ : A global analysis

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