Anomalies in 8Be nuclear transitions and (g − 2)e,μ: towards a minimal combined explanation

Hati, Chandan; Kriewald, J.; Orloff, J.; Teixeira, Ana

doi:10.1007/jhep07(2020)235

Cited by 44 publications

(17 citation statements)

References 149 publications

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“…For a sample of other recent suggestions made for the simultaneous explanation of the ∆a e,µ anomalies, we refer the readers to refs. [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78].…”

Section: Introductionmentioning

confidence: 99%

Power-aligned 2HDM: a correlative perspective on (g − 2)e,μ

et al. 2021

J. High Energ. Phys.

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With the hypothesis of minimal flavor violation, we find that there exists a power-aligned relation between the Yukawa couplings of the two scalar doublets in the two-Higgs-doublet model with Hermitian Yukawa matrices. Within such a power-aligned framework, it is found that a simultaneous explanation of the anomalies observed in the electron and muon anomalous magnetic moments can be reached with TeV-scale quasi-degenerate Higgs masses, and the resulting parameter space is also phenomenologically safer under the B-physics, Z and τ decay data, as well as the current LHC bounds. Furthermore, the flavor-universal power that enhances the charged-lepton Yukawa couplings prompts an interesting correlation between the two anomalies, which makes the model distinguishable from the (generalized) linearly aligned and the lepton-specific two-Higgs-doublet models that address the same anomalies but in a non-correlative manner, and hence testable by future precise measurements.

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Section: Introductionmentioning

confidence: 99%

Power-aligned 2HDM: a correlative perspective on (g − 2)e,μ

et al. 2021

J. High Energ. Phys.

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“…In particular, many popular models in which the anomaly scales with the square of the lepton mass [16] tend to generate too large δa e with the wrong sign. Some authors [17] argue that if the origin of both anomalies is beyond the SM, the corresponding model must incorporate some sort of effective decoupling between μ and e. Recent beyond-SM explanations of both anomalies can be found in [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. A minimal extension of the SM is the two-Higgs-doublets model (2HDM) [33] which introduces, in general, a new set of flavor structures in the Yukawa sector.…”

Section: Introductionmentioning

confidence: 99%

Electron and muon g−2 anomalies in general flavor conserving two-Higgs-doublet models

Botella

Cornet-Gomez

Nebot³

2020

Phys. Rev. D

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In general two-Higgs-doublet models (2HDMs) without scalar flavor changing neutral couplings (SFCNC) in the lepton sector, the electron, muon, and tau interactions can be decoupled in a robust framework, stable under renormalization group evolution. In this framework, the breaking of lepton flavor universality (LFU) goes beyond the mass proportionality, opening the possibility to accommodate in a simple manner a different behavior among charged leptons. We analyze simultaneously the electron and muon (g − 2) anomalies in the context of these general flavor conserving models in the leptonic sector (glFC). We consider two different models, I-glFC and II-glFC, in which the quark Yukawa couplings coincide, respectively, with the ones in type I and in type II 2HDMs. We find two types of solutions that fully reproduce both (g − 2) anomalies, and which are compatible with experimental constraints from LEP and LHC, from LFU, from flavor and electroweak physics, and with theoretical constraints in the scalar sector. In the first type of solution, all the new scalars have masses in the 1-2.5 TeV range, the vacuum expectation values (vevs) of both doublets are quite similar in magnitude, and both anomalies are dominated by two loop Barr-Zee contributions. This solution appears in both models. There is a second type of solution, where one loop contributions are dominant in the muon anomaly, all new scalars have masses below 1 TeV, and the ratio of vevs is in the range 10-100. The second neutral scalar H is the lighter among the new scalars, with a mass in the 210-390 GeV range while the pseudoscalar A is the heavier, with a mass in the range 400-900 GeV. The new charged scalar H AE is almost degenerate either with the scalar or with the pseudoscalar. This second type of solution only appears in the I-glFC model. Both solutions require the soft breaking of the Z 2 symmetry of the Higgs potential.

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“…Interestingly, this measurement also shows a possible disagreement between the data and theory, with the measured value lower than the SM prediction by JHEP09(2020)119 about 2.4σ [13]. These tantalizing opposite deviations have invited many studies to explore suitable NP models [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

An explanation for the muon and electron g − 2 anomalies and dark matter

Chen

Chiang

Yagyu

2020

J. High Energ. Phys.

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We propose simple models with a flavor-dependent global U(1)ℓ and a discrete ℤ2 symmetries to explain the anomalies in the measured anomalous magnetic dipole moments of muon and electron, (g − 2)μ,e, while simultaneously accommodating a dark matter candidate. These new symmetries are introduced not only to avoid the dangerous lepton flavor-violating decays of charged leptons, but also to ensure the stability of the dark matter. Our models can realize the opposite-sign contributions to the muon and electron g − 2 via one-loop diagrams involving new vector-like leptons. Under the vacuum stability and perturbative unitarity bounds as well as the constraints from the dark matter direct searches and related LHC data, we find suitable parameter space to simultaneously explain (g − 2)μ,e and the relic density. In this parameter space, the coupling of the Higgs boson with muons can be enhanced by up to ∼ 38% from its Standard Model value, which can be tested in future collider experiments.

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Anomalies in 8Be nuclear transitions and (g − 2)e,μ: towards a minimal combined explanation

Cited by 44 publications

References 149 publications

Power-aligned 2HDM: a correlative perspective on (g − 2)e,μ

Power-aligned 2HDM: a correlative perspective on (g − 2)e,μ

Electron and muon g−2 anomalies in general flavor conserving two-Higgs-doublet models

An explanation for the muon and electron g − 2 anomalies and dark matter

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