Radiative seesaw corrections and charged-lepton decays in a model with soft flavour violation

Aeikens, Elke; Ferreira, P. M.; Grimus, Walter; Jurčiukonis, Darius; Lavoura, L.

doi:10.1007/jhep12(2020)122

Cited by 2 publications

(2 citation statements)

References 48 publications

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“…The neutral scalars S 0 3 and S 0 4 are unimportant in this paper. We use the following notation [65] for the matrix elements of Γ 1,2 and ∆ 1,2 :…”

Section: Restriction To a Two-higgs-doublet Modelmentioning

confidence: 99%

Two-body lepton-flavour-violating decays in a 2HDM with soft family-lepton-number breaking

Jurčiukonis

Lavoura

2022

J. High Energ. Phys.

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We evaluate the decays $$ {\ell}_1^{\pm } $$ ℓ 1 ± → $$ {\ell}_2^{\pm}\gamma $$ ℓ 2 ± γ , Z → $$ {\ell}_1^{+}{\ell}_2^{-} $$ ℓ 1 + ℓ 2 − , and h → $$ {\ell}_1^{+}{\ell}_2^{-} $$ ℓ 1 + ℓ 2 − , where ℓ1 and ℓ2 are charged leptons with different flavours and h is the scalar particle with mass 125.25 GeV, in a two-Higgs-doublet model where all the Yukawa-coupling matrices conserve the lepton flavours but the Majorana mass terms of the right-handed neutrinos break the flavour lepton numbers. We find that (1) the decays $$ {\ell}_1^{\pm } $$ ℓ 1 ± → $$ {\ell}_2^{\pm}\gamma $$ ℓ 2 ± γ require large Yukawa couplings and very light right-handed neutrinos in order to be visible, (2) the decays Z → $$ {\ell}_1^{+}{\ell}_2^{-} $$ ℓ 1 + ℓ 2 − will be invisible in all the planned experiments, except in a very restricted range of circumstances, but (3) the decays h → $$ {\ell}_1^{+}{\ell}_2^{-} $$ ℓ 1 + ℓ 2 − may be detected in future experiments for rather relaxed sets of input parameters.

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“…The neutral scalars S 0 3 and S 0 4 are unimportant in this paper. We use the following notation [65] for the matrix elements of Γ 1,2 and ∆ 1,2 :…”

Section: Restriction To a Two-higgs-doublet Modelmentioning

confidence: 99%

Two-body lepton-flavour-violating decays in a 2HDM with soft family-lepton-number breaking

Jurčiukonis

Lavoura

2022

J. High Energ. Phys.

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“…This is what we will assume in our analysis (we refer the reader to ref. [94] for a model where these neutral scalar contributions are taken into account). As for divergences, those coming from the G 0 and H 0 loops cancel each other, likewise for the R and I scalars.…”

Section: Radiative Corrections To Neutrino Massesmentioning

confidence: 99%

Minimal inverse-seesaw mechanism with Abelian flavour symmetries

Câmara

Felipe

Joaquim

2021

J. High Energ. Phys.

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We study the phenomenology of the minimal (2, 2) inverse-seesaw model supplemented with Abelian flavour symmetries. To ensure maximal predictability, we establish the most restrictive flavour patterns which can be realised by those symmetries. This setup requires adding an extra scalar doublet and two complex scalar singlets to the Standard Model, paving the way to implement spontaneous CP violation. It is shown that such CP-violating effects can be successfully communicated to the lepton sector through couplings of the scalar singlets to the new sterile fermions. The Majorana and Dirac CP phases turn out to be related, and the active-sterile neutrino mixing is determined by the active neutrino masses, mixing angles and CP phases. We investigate the constraints imposed on the model by the current experimental limits on lepton flavour-violating decays, especially those on the branching ratio BR(μ → eγ) and the capture rate CR(μ − e, Au). The prospects to further test the framework put forward in this work are also discussed in view of the projected sensitivities of future experimental searches sensitive to the presence of heavy sterile neutrinos. Namely, we investigate at which extent upcoming searches for μ → eγ, μ → 3e and μ − e conversion in nuclei will be able to test our model, and how complementary will future high-energy collider and beam-dump experiments be in that task.

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Radiative seesaw corrections and charged-lepton decays in a model with soft flavour violation

Cited by 2 publications

References 48 publications

Two-body lepton-flavour-violating decays in a 2HDM with soft family-lepton-number breaking

Two-body lepton-flavour-violating decays in a 2HDM with soft family-lepton-number breaking

Minimal inverse-seesaw mechanism with Abelian flavour symmetries

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