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

Hamaguchi, Koichi; Osaki, Genta; Tseng, Shih-Yen

doi:10.1007/jhep01(2023)100

Cited by 8 publications

(2 citation statements)

References 53 publications

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“…[33] presented a general discussion for the case of the muon g−2 and EDM. In addition, a model with extra vector-like leptons also has a possibility to predict a large muon EDM [34,35] due to the chirality flip on a heavy lepton line.…”

Section: Jhep02(2023)234mentioning

confidence: 99%

A large muon EDM from dark matter

Khaw

Nakai

Sato

et al. 2023

J. High Energ. Phys.

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We explore a model of dark matter (DM) that can explain the reported discrepancy in the muon anomalous magnetic moment and predict a large electric dipole moment (EDM) of the muon. The model contains a DM fermion and new scalars whose exclusive interactions with the muon radiatively generate the observed muon mass. Constraints from DM direct and indirect detection experiments as well as collider searches are safely evaded. The model parameter space that gives the observed DM abundance and explains the muon g – 2 anomaly leads to the muon EDM of dμ ≃ (4-5) × 10−22e cm that can be probed by the projected PSI muEDM experiment. Another viable parameter space even achieves $$ {d}_{\mu }=\mathcal{O}\left({10}^{-21}\right) $$ d μ = O 10 − 21 e cm reachable by the ongoing Fermilab Muon g − 2 experiment and the future J-PARC Muon g − 2/EDM experiment.

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Section: Jhep02(2023)234mentioning

confidence: 99%

A large muon EDM from dark matter

Khaw

Nakai

Sato

et al. 2023

J. High Energ. Phys.

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show abstract

“…While the Standard Model allows CP violation in the weak interactions by virtue of the complex phase of the Cabibbo-Kobayashi-Maskawa matrix [5], this predicted source of CP violation is extremely small and insufficient to give rise to the observed baryon asymmetry of the Universe. In fact, contributions to the lepton EDMs only arise at the four-loop level and are significantly suppressed [6], rendering them far beyond the reach of current experimental measurements [7]. As a result, a successful experimental detection of the muon EDM would serve as compelling evidence for new physics.…”

Section: Introductionmentioning

confidence: 99%

Status of the search for a muon EDM using the frozen-spin technique

Chakraborty,

Calzolaio,

Doinaki

et al. 2023

J. Inst.

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Despite the many successes of the Standard Model of particle physics, there are still several physical observations that it cannot explain, such as the matter-antimatter asymmetry, non-zero neutrino masses, and the microscopic nature of dark matter. To address these limitations, extensions to the standard model are necessary, and searches for electric dipole moments (EDMs) of leptons are valuable test. The search for a muon EDM is the only search on a bare lepton of the second generation, complementing the searches for an EDM of the electron using polar molecules. A non-zero EDM of the muon would indicate Charge-Parity symmetry violation beyond the standard model. A dedicated experimental search for the muon EDM is being set up at PSI using the frozen-spin technique. In this technique, the anomalous spin precession of the muons in a storage ring is suppressed by applying an electric field in the radial direction. The muon EDM experiment will take place in two phases: the first phase will demonstrate the frozen-spin technique using a precursor experiment with 28 MeV/c muons, while the second phase will make use of 125 MeV/c muons, which could search for the muon EDM with a sensitivity of 6 × 10-23 e·cm. In this talk, we describe the precursor experiment at PSI and provide an update on the status of the experiment.

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An SU(5) × U(1)′ SUSY GUT with a “vector-like chiral” fourth family to fit all low energy data, including the muon g − 2

Kulkarni

Raby

2023

J. High Energ. Phys.

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An additional generation of quarks and leptons and their SUSY counterparts, which are vector-like under the Standard Model gauge group but are chiral with respect to the new U(1)3−4 gauge symmetry, are added to the Minimal Supersymmetric Standard Model (MSSM). We show that this model is a GUT and unifies the three SM gauge couplings and also the additional U(1)3−4 coupling at a GUT scale of ≈ 5 × 1016 GeV and explains the experimentally observed deviation of the muon g – 2. We also fit the quark flavor changing processes consistent with the latest experimental data and look at the effect of the new particles on the W boson mass without obviously conflicting with the observed masses of particles, CKM matrix elements, neutrino mixing angles, their mass differences, and the lepton-flavor violating bounds. This model predicts sparticle masses less than 25 TeV, with a gluino mass ≈ 2.3 – 3 TeV consistent with constraints, and one of the neutralinos as the LSP with a mass of ≈ 480 – 580 GeV, which is a potential dark matter candidate. The model is string theory motivated and predicts the VL quarks, leptons, a massive Z′ and two Dirac neutrinos at the TeV scale and the branching ratios of μ ⟶ eγ, τ ⟶ μγ and τ ⟶ 3μ with BR(μ ⟶ eγ) within reach of future experiments.

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

Cited by 8 publications

References 53 publications

A large muon EDM from dark matter

A large muon EDM from dark matter

Status of the search for a muon EDM using the frozen-spin technique

An SU(5) × U(1)′ SUSY GUT with a “vector-like chiral” fourth family to fit all low energy data, including the muon g − 2

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