Lepton flavor violation and neutrino masses from A5 and CP in the non-universal MSSM

López-Ibáñez, M. L.; Melis, Aurora; Meloni, Davide; Vives, O.

doi:10.1007/jhep06(2019)047

Cited by 9 publications

(8 citation statements)

References 77 publications

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“…A possible way to keep them under control has been discussed in [71] and consist of introducing an additional Z N symmetry. By choosing a suitable combination of charges for the fields, the NLO contribution to the charged-lepton masses is schematically given by…”

Section: A 5 Cp Symmetrymentioning

confidence: 99%

“…where ε ν = φ ν / f and the 1−entry matrix symbolises a matrix whose elements are O(1) but not necessarily equal. The size of ε ν depends on the specific mechanism generating the light neutrino masses, but must always be within the usual perturbative range ε ν 0.3 [71]. Instead, the n exponent can be made as large as needed (by an adequate charge assignment under Z N ) so that the off-diagonal entries in the dipole matrix of Eq.…”

Section: A 5 Cp Symmetrymentioning

confidence: 99%

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Implications of the Muon g-2 result on the flavour structure of the lepton mass matrix

2021

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The confirmation of the discrepancy with the Standard Model predictions in the anomalous magnetic moment by the Muon g-2 experiment at Fermilab points to a low scale of new physics. Flavour symmetries broken at low energies can account for this discrepancy but these models are much more restricted, as they would also generate off-diagonal entries in the dipole moment matrix. Therefore, if we assume that the observed discrepancy in the muon $$g-2$$ g - 2 is explained by the contributions of a low-energy flavor symmetry, lepton flavour violating processes can constrain the structure of the lepton mass matrices and therefore the flavour symmetries themselves predicting these structures. We apply these ideas to several discrete flavour symmetries popular in the leptonic sector, such as $$\Delta (27)$$ Δ ( 27 ) , $$A_4$$ A 4 , and $$A_5 < imes \mathrm{CP}$$ A 5 ⋉ CP .

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Section: A 5 Cp Symmetrymentioning

confidence: 99%

Section: A 5 Cp Symmetrymentioning

confidence: 99%

Implications of the Muon g-2 result on the flavour structure of the lepton mass matrix

2021

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“…(Barreiros et al, 2019). In the case of G = A 5 CP, one-parameter families of PMNS matrices have been studied (Ballett et al, 2015;Di Iura et al, 2015Li and Ding, 2015b;López-Ibáñez et al, 2019), typically having trivial or maximal Dirac CP phase and trivial Majorana phases. This study has been generalized in ref.…”

Section: Other Examplesmentioning

confidence: 99%

Lepton Flavour Symmetries

Feruglio,

Romanino

2019

Preprint

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We provide a general classification of flavour symmetries according to their interplay with the proper Poincaré and gauge groups and to their linear or nonlinear action in field space. We focus on the lepton sector and we review the different types of symmetries describing neutrino masses and the lepton mixing matrix. For each type of symmetry we present several illustrative examples and we discuss specific strengths and limitations.

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“…A similar effect can occur in the soft terms of supersymmetric flavor models generated by a FN mechanism mediated by supergravity, see[12][13][14][15].…”

mentioning

confidence: 67%

Constraining Low-Scale Flavor Models with $\boldsymbol{(g-2)_μ}$ and Lepton Flavor Violation

López-Ibáñez,

Melis,

Pérez

et al. 2021

Preprint

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We present here two concrete examples of models where a sub-TeV scale breaking of their respective T 13 and A 5 flavor symmetries is able to account for the recently observed discrepancy in the muon anomalous magnetic moment, (g−2) µ . Similarities in the flavor structures of the charged-lepton Yukawa matrix and dipole matrix yielding (g − 2) µ give rise to strong constraints on low-scale flavor models when bounds from lepton flavor violation (LFV) are imposed. These constraints place stringent limits on the off-diagonal Yukawa structure, suggesting a mostly (quasi-)diagonal texture for models with a low flavor breaking scale Λ f . We argue that many of the popular flavor models in the literature designed to explain the fermion masses and mixings are not suitable for reproducing the observed discrepancy in (g − 2) µ , which requires a delicate balance of maintaining a low flavor scale while simultaneously satisfying strong LFV constraints.

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Lepton flavor violation and neutrino masses from A5 and CP in the non-universal MSSM

Cited by 9 publications

References 77 publications

Implications of the Muon g-2 result on the flavour structure of the lepton mass matrix

Implications of the Muon g-2 result on the flavour structure of the lepton mass matrix

Lepton Flavour Symmetries

Constraining Low-Scale Flavor Models with $\boldsymbol{(g-2)_μ}$ and Lepton Flavor Violation

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