Seesaw lepton masses and muon $$g-2$$ from heavy vector-like leptons

Lee, Hyun Min; Song, Jiseon; Yamashita, Kimiko

doi:10.1007/s40042-021-00339-0

Cited by 15 publications

(30 citation statements)

References 49 publications

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“…We introduce an SU (2) L singlet vector-like lepton, E, with charge −2 and a dark Higgs field φ with charge −2 under the U (1) gauge symmetry [7,8]. We also have a Higgs doublet H with the same quantum numbers as the SM Higgs H, except the charge +2 under the U (1) .…”

Section: The Modelmentioning

confidence: 99%

“…Here, we note that the gauge kinetic mixing also contributes to the mixing between Z and Z gauge bosons [8,10], but we took it to zero, for simplicity. Our results hold as far as | tan ξ| 4(g Z /g Y ) sin 2 β.…”

Section: Lepton Masses and Mixingsmentioning

confidence: 99%

“…We also discuss the SM Higgs Yukawa interactions in the presence of the mixing between the lepton and the vector-like lepton. Considering the mixing angle α between the CP-even neutral Higgs scalars belonging to H and H [8] but ignoring the mixing with the dark Higgs coming from φ, we get the effective lepton Yukawa interaction to the SM Higgs h, as follows,…”

Section: Lepton Masses and Mixingsmentioning

confidence: 99%

“…We consider an extension of the SM with an SU (2) L singlet vector-like lepton, which is charged under a local U (1) symmetry as introduced in Ref. [7,8]. We assume that the SM particles are neutral under the U (1) but the second Higgs doublet carrying the U (1) charge is introduced for the mixing between the muon and the vector-like lepton.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Lee¹,

Yamashita²

2022

Preprint

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We consider a simple extension of the Standard Model (SM) with a vector-like lepton and a local U (1) symmetry, motivated by the recent experimental anomalies in the muon g−2 and the W boson mass. The U (1) symmetry is spontaneously broken by the VEVs of the dark Higgs scalar and the second Higgs doublet, giving rise to the mixing between the muon and the vector-like lepton. As a result, we obtain the desirable corrections to the muon g − 2 and the W boson mass simultaneously, dominantly due to the Z gauge interactions for the vector-like lepton and the second Higgs doublet, respectively. We also discuss the consistency of the model with the Z boson decay width, the Higgs couplings and the dilepton bounds.

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Section: The Modelmentioning

confidence: 99%

Section: Lepton Masses and Mixingsmentioning

confidence: 99%

Section: Lepton Masses and Mixingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Lee¹,

Yamashita²

2022

Preprint

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“…These are the features in this work, which are distinguishable from other approaches to tackle the flavor problem in the extra-dimension framework [3][4][5][6][7][8][9][10][11][12][13][14]. A simple toy model with vector-like leptons for seesaw leptons has been recently proposed in light of the muon g − 2 anomaly [15], but without involving a flavor symmetry.…”

Section: Introductionmentioning

confidence: 99%

Towards a Model of Quarks and Leptons

Ahn¹

2021

Preprint

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We propose an extra-dimension framework on the orbifold S 1 /Z2 for understanding the origin of the fermion mass and mixing hierarchies. Introducing the flavor symmetry GF (=non-Abelian×Abelian) as well as the extra gauged U (1) symmetries through the bulk, we regard the SU (2) singlet and doublet fermions in the Standard Model (SM) to be localized at the separate 3-branes and let the extra SU (2) singlet flavored fermions in the bulk couple to the SM fermions at the 3-branes. The extra U (1) symmetries satisfy the U (1) gravitational anomaly-free condition, playing a crucial role in achieving the desirable fermion mass and mixing hierarchies and making the flavored axion naturally light. The singlet scalar fields, the flavon fields, are responsible for the spontaneous breaking of GF on the two 3-branes, while the SU (2) singlet flavored fermions are integrated out to give rise to the effective Yukawa couplings for the SM fermions, endowed with the information of GF breaking in the two sectors. The flavored axion from the PQ symmetry is also proposed for solving the strong CP problem and being a dark matter candidate in our model.

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Systematically testing singlet models for (g − 2)μ

Capdevilla

Curtin

Kahn

et al. 2022

J. High Energ. Phys.

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We comprehensively study all viable new-physics scenarios that resolve the muon (g − 2)μ anomaly with only Standard Model singlet particles coupled to muons via renormalizable interactions. Since such models are only viable in the MeV–TeV mass range and require sizable muon couplings, they predict abundant accelerator production through the same interaction that resolves the anomaly. We find that a combination of fixed-target (NA64μ, M3), B-factory (BABAR, Belle II), and collider (LHC, muon collider) searches can cover nearly all viable singlets scenarios, independently of their decay modes. In particular, future muon collider searches offer the only certain test of singlets above the GeV scale, covering all higher masses up to the TeV-scale unitarity limit for these models. Intriguingly, we find that $$ \mathcal{O}\left(100\ \mathrm{GeV}\right) $$ O 100 GeV muon colliders may yield better coverage for GeV-scale singlets compared to TeV-scale concepts, which has important implications for the starting center-of-mass energy of a staged muon collider program.

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Seesaw lepton masses and muon $$g-2$$ from heavy vector-like leptons

Cited by 15 publications

References 49 publications

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

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

Towards a Model of Quarks and Leptons

Systematically testing singlet models for (g − 2)μ

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