Reflecting on chirality: 
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-violating extensions of the single scalar-leptoquark solutions for the 
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Bigaran, Innes; Volkas, Raymond R.

doi:10.1103/physrevd.105.015002

Cited by 24 publications

(3 citation statements)

References 88 publications

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“…Starting from our model featuring three generations of Φ 2 LQs, the associated Wilson coefficient is obtained after integrating out the heavy LQs [165,174,211,212],…”

Section: Anomalous Magnetic Moments and Electric Dipole Moments Of Le...mentioning

confidence: 99%

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Explaining the hints for lepton flavour universality violation with three $S_2$ leptoquark generations

Crivellin,

Fuks,

Schnell

2022

Preprint

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Leptoquarks are prime candidates for explaining the intriguing hints for lepton flavour universality violation. In particular, the SU (2) L doublet of scalar leptoquarks S 2 is capable of providing an explanation for the tensions between the measurements and the Standard Model predictions in (g − 2) µ , b → s + − and b → cτ ν processes, as well as in non-resonant di-electron production. However, in the minimal setup with a single leptoquark generation, a common explanation for all these issues is not possible as this would lead to unacceptably large charged lepton flavour violation. We therefore propose a model with three generations of S 2 , each coupling exclusively to a single lepton flavour, i.e. a model extending the Standard Model particle content by an electroquark, a muoquark and a tauquark. We show that after taking into account other constraints, such as those originating from electroweak precision observables and ∆F = 2 processes, it is possible to provide a combined explanation for all these hints of lepton flavour universality violation. Moreover, we find that the presence of the tauquark can generate a dimension-six O U 9 operator via off-shell photon penguin diagrams, which, together with the muoquark contribution, further improves the global fit to b → s + − data.

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“…Starting from our model featuring three generations of Φ 2 LQs, the associated Wilson coefficient is obtained after integrating out the heavy LQs [165,174,211,212],…”

Section: Anomalous Magnetic Moments and Electric Dipole Moments Of Le...mentioning

confidence: 99%

“…with the dominant contribution being the one proportional to the real and imaginary part of Ŷ LR 3 Y RL * 3 respectively. In addition, the same combination of LQ Yukawa matrix elements contributes to a radiative shift in the charged lepton masses [174],…”

Section: Anomalous Magnetic Moments and Electric Dipole Moments Of Le...mentioning

confidence: 99%

Explaining the hints for lepton flavour universality violation with three $S_2$ leptoquark generations

Crivellin,

Fuks,

Schnell

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The existence of these two anomalies has been addressed in a variety of scenarios, including models with extra Higgs doublets [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38], models with other scalar extensions [39][40][41][42][43][44][45][46][47][48] and supersymmetric models [49][50][51][52][53]. There are also plenty of studies with other approaches such as leptoquarks, vector-like fermions or extra gauge bosons, among others [54][55][56][57][58][59][60][61][62][63][64][65][66][67][68]…”

Section: Introductionmentioning

confidence: 99%

Muon and electron $g-2$ anomalies in a flavor conserving 2HDM with an oblique view on the CDF $M_W$ value

Botella¹,

Cornet-Gomez²,

Miró³

et al. 2022

Preprint

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We consider a type I or type X two Higgs doublets model with a modified lepton sector. The generalized lepton sector is also flavor conserving but with the new Yukawa couplings completely decoupled from lepton mass proportionality. The model is one loop stable under renormalization group evolution and it allows to reproduce the g − 2 muon anomaly together with the different scenarios one can consider for the electron g − 2 anomaly, related to the Cesium and/or to the Rubidium recoil measurements of the fine structure constant. Thorough parameter space analyses are performed to constrain all the model parameters in the different scenarios, either including or not including the recent CDF measurement of the W boson mass. For light new scalars with masses in the 0.2-1.0 TeV range, the muon anomaly receives dominant one loop contributions; it is for heavy new scalars with masses above 1.2 TeV that two loop Barr-Zee diagrams are needed. The electron g − 2 anomaly, if any, must always be obtained with the two loop contributions. The final allowed regions are quite sensitive to the assumptions about perturbativity of Yukawa couplings, which influence unexpected observables like the allowed scalar mass ranges. On that respect, intermediate scalar masses, highly constrained by direct LHC searches, are allowed provided that the new lepton Yukawa couplings are fully scrutinized, including values up to 250 GeV. In the framework of a complete model, fully numerically analysed, we show the implications of the recent M W measurement.

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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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Reflecting on chirality: CP -violating extensions of the single scalar-leptoquark solutions for the (g−2)e,μ

Cited by 24 publications

References 88 publications

Explaining the hints for lepton flavour universality violation with three $S_2$ leptoquark generations

Explaining the hints for lepton flavour universality violation with three $S_2$ leptoquark generations

Muon and electron $g-2$ anomalies in a flavor conserving 2HDM with an oblique view on the CDF $M_W$ value

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

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