A Model of Vector-like Leptons for the Muon $g-2$ and the $W$ Boson Mass

Lee, Hyun Min; Yamashita, Kimiko

doi:10.48550/arxiv.2204.05024

Cited by 9 publications

(21 citation statements)

References 21 publications

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“…This is in contrast to the model studied in Ref. [20], and hence the W -mass could be addressed in this model solely by the VL leptons.…”

Section: Couplings At the Leading Ordermentioning

confidence: 85%

$W$ mass in a model with vector-like leptons and $U(1)^\prime$

Kawamura,

Raby

2022

Preprint

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We study the effects of vector-like leptons on the W boson mass in a model with a vector-like U (1) gauge symmetry. This model provides simultaneous explanations for the recent anomalies in the muon anomalous magnetic moment and the semi-leptonic decays of B mesons. We found that the recent result of the W boson mass precise measurement at CDF can be explained if the charged (neutral) vector-like lepton is lighter than 250 (80) GeV. The light vector-like leptons may not be excluded by collider experiments if these decay to a physical mode of the U (1) breaking scalar field.

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“…This is in contrast to the model studied in Ref. [20], and hence the W -mass could be addressed in this model solely by the VL leptons.…”

Section: Couplings At the Leading Ordermentioning

confidence: 85%

$W$ mass in a model with vector-like leptons and $U(1)^\prime$

Kawamura,

Raby

2022

Preprint

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“…h with m h being the SM Higgs boson mass. The current bound is given by [53] µ γγ = 1.00 ± 0.06, (18) where the absence of other exotic Higgs decay mode is assumed.…”

Section: Modification Of H → γγ Decay Widthmentioning

confidence: 99%

A model explaining the new CDF II W boson mass linking to muon $g-2$ and dark matter

Nagao¹,

Nomura²,

Okada³

2022

Preprint

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We propose a model to explain the W boson mass anomaly reported by CDFII collaboration that would suggest new physics. We introduce exotic fermions; one isospin doublet vector-like lepton, one isospin singlet singly-charged vector-like lepton and an isospin doublet inert scalar. These new fermions also provide us with sizable anomalous magnetic moment (muon g − 2) due to no chiral suppression and nonzero mass difference between the real and imaginary parts of neutral inert scalar bosons. This mass difference and doublet vector-like leptons affect the oblique parameters, especially ∆T , whose shift from zero are the direct consequence of this W boson mass anomaly.We search for the allowed parameter region to explain both the phenomenologies. In addition, we discuss a dark matter candidate assuming the real part of the inert scalar boson to be the one. We find that lighter DM mass is favored.

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“…There has been a longstanding anomaly in the muon g − 2 from Brookhaven E821 [1], showing the deviation from the SM prediction [2], and it has been recently confirmed by Fermilab E989 [3] with the combined significance at the level of 4.2σ. Furthermore, the measured W boson mass at Tevatron CDFII [4] is deviated with high significance from the SM prediction [5] and the previously measured values [6], stirring renewed interests in the electroweak precision data [7], models with extra Higgs multiplets [8,9], and extra fermions or gauge bosons [8,10]. There is a need of improvements on the experimental errors and the theory predictions for those most well measured and understood observables.…”

Section: Introductionmentioning

confidence: 97%

“…There is a need of improvements on the experimental errors and the theory predictions for those most well measured and understood observables. Nonetheless, it is also important to make a connection between the muon g − 2 and the W boson mass in a unified framework [8,11], provide more information for further developments and suggest new ideas for other experimental searches such as dark matter experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, we propose a consistent framework for explaining the muon g − 2 and the W boson mass as well as the dark matter puzzles simultaneously. We aim to address some flavor puzzles such as small fermion masses, in particular, lepton masses, in the presence of vector-like leptons [8,12]. In the current work, we introduce an extra SU (2) D gauge symmetry and vector-like new fermions in its fundamental representation beyond the SM.…”

Section: Introductionmentioning

confidence: 99%

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The $SU(2)_D$ lepton portals for muon $g-2$, $W$ boson mass and dark matter

Kim,

Lee,

Menkara

et al. 2022

Preprint

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We propose a novel model for lepton flavor and dark matter based on the SU (2) D gauge symmetry and vector-like leptons in its fundamental representations. We introduce a dark SU (2) D Higgs doublet and a Higgs bi-doublet for the mass mixing between the vector-like lepton and the lepton. As a result, the seesaw lepton masses are generated and there are sizable one-loop contributions to the muon g − 2 via the SU (2) D gauge bosons and the relatively heavy vector-like lepton, as indicated in Fermilab E989. The tree-level mass mixing between the Z boson and the isospin neutral gauge boson of SU (2) D in our model accounts for the shift in the W boson mass, being consistent with Tevatron CDFII. Finally, we show that the isospin charged gauge boson of SU (2) D becomes a plausible candidate for dark matter with a small mass splitting tied up to the modified W boson mass, and there is a viable parameter space where the favored corrections to the muon g − 2 and the W boson mass and the dark matter constraints are simultaneously fulfilled.

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A Model of Vector-like Leptons for the Muon $g-2$ and the $W$ Boson Mass

Cited by 9 publications

References 21 publications

$W$ mass in a model with vector-like leptons and $U(1)^\prime$

$W$ mass in a model with vector-like leptons and $U(1)^\prime$

A model explaining the new CDF II W boson mass linking to muon $g-2$ and dark matter

The $SU(2)_D$ lepton portals for muon $g-2$, $W$ boson mass and dark matter

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