Complete vectorlike fourth family and new 
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 for muon anomalies

Kawamura, Junichiro; Raby, Stuart; Trautner, Andreas

doi:10.1103/physrevd.100.055030

Cited by 61 publications

(30 citation statements)

References 198 publications

(199 reference statements)

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“…In an attempt to distinguish these two possibilities, one might focus on a cluster of discrepancies which can all be resolved with the same new physics. This is what we have done in a previous letter [1]. We have shown that the muon anomalies associated with the anomalous magnetic moment of the muon, ∆a µ , and the angular and lepton non-universality anomalies in b → s + − decays can simultaneously be resolved by the addition to the SM of a complete vector-like (VL) family of quarks and leptons together with a new U(1) gauge symmetry carried only by the new VL states.…”

Section: Introductionsupporting

confidence: 83%

“…As already discussed in more detail in [1], the U(1) gauge coupling g diverges at a Landau pole at the scale…”

Section: Landau Pole Constraints On the U(1) Gauge Couplingmentioning

confidence: 60%

“…We have already shown that this model can explain the muon anomalies without spoiling other observables in Ref. [1]. The purpose of the present paper is to completely map out the parameter space where muon anomalies are explained consistently with all other observables, and at the same time discuss the consequences for future experiments.…”

Section: Observablesmentioning

confidence: 79%

See 2 more Smart Citations

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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Section: Introductionsupporting

confidence: 83%

“…As already discussed in more detail in [1], the U(1) gauge coupling g diverges at a Landau pole at the scale…”

Section: Landau Pole Constraints On the U(1) Gauge Couplingmentioning

confidence: 60%

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

2020

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“…The µ-e conversion process in nuclei induced by flavons might be detectable [142]. The conversion rate is given by [150,151], [160].…”

Section: Lepton Flavor Violationmentioning

confidence: 99%

“…We employed the same constant values of the SM contributions and the hadronic matrix elements as in Ref. [160]. Their values relevant to our analysis are shown in Table 4.…”

Section: Quark Flavor Violationmentioning

confidence: 99%

A low-scale flavon model with a ℤN symmetry

Higaki

Kawamura

2020

J. High Energ. Phys.

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We propose a model that explains the fermion mass hierarchy by the Froggatt-Nielsen mechanism with a discrete Z F N symmetry. As a concrete model, we study a supersymmetric model with a single flavon coupled to the minimal supersymmetric Standard Model. Flavon develops a TeV scale vacuum expectation value for realizing flavor hierarchy, an appropriate µ-term and the electroweak scale, hence the model has a low cutoff scale. We demonstrate how the flavon is successfully stabilized together with the Higgs bosons in the model. The discrete flavor symmetry Z F N controls not only the Standard Model fermion masses, but also the Higgs potential and a mass of the Higgsino which is a good candidate for dark matter. The hierarchy in the Higgs-flavon sector is determined in order to make the model anomaly-free and realize a stable electroweak vacuum. We show that this model can explain the fermion mass hierarchy, realistic Higgs-flavon potential and thermally produced dark matter at the same time. We discuss flavor violating processes induced by the light flavon which would be detected in future experiments. N sym-1 Recently, it is proposed that a flavon can be identified as the QCD axion [3-8] 2 See, e.g., Refs. [35,36] for recent models with a flavor modular symmetry and also for such interactions in string models.3 Models with a combination of Higgs doublets H u H d as a flavon are studied in Refs. [41][42][43].

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Probing new physics in the vector-like lepton model by lepton electric dipole moments

Hamaguchi

Osaki

Tseng

2023

J. High Energ. Phys.

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We examine the lepton dipole moments in an extension of the Standard Model (SM), which contains vector-like leptons that couple only to the second-generation SM leptons. The model naturally leads to sizable contributions to the muon g − 2 and the muon electric dipole moment (EDM). One feature of this model is that a sizable electron EDM is also induced at the two-loop level due to the existence of new vector-like leptons in the loops. We find parameter regions that can explain the muon g − 2 anomaly and are also consistent with the experimental constraints coming from the electron EDM and the Higgs decay h → μ+μ−. The generated EDMs can be as large as $$ \mathcal{O} $$ O (10−22)e∙cm for the muon and $$ \mathcal{O} $$ O (10−30)e∙cm for the electron, respectively, which can be probed in future experiments for the EDM measurements.

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

Cited by 61 publications

References 198 publications

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

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

A low-scale flavon model with a ℤN symmetry

Probing new physics in the vector-like lepton model by lepton electric dipole moments

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