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arXiv · 2009.13479

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

E. H. Aeikens·P. M. Ferreira·W. Grimus·D. Jurčiukonis·L. Lavoura
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Abstract

We consider the one-loop radiative corrections to the light-neutrino mass matrix and their consequences for the predicted branching ratios of the five lepton-flavour-violating decays $\ell_1^- \to \ell_2^- \ell_3^+ \ell_3^-$ in a two-Higgs-doublet model furnished with the type-I seesaw mechanism and soft lepton-flavour violation. We find that the radiative corrections are very significant; they may alter the predicted branching ratios by several orders of magnitude and, in particular, they may help explain why $\mbox{BR}(\mu^- \to e^- e^+ e^-)$ is strongly suppressed relative to the branching ratios of the decays of the $\tau^-$. We conclude that, in any serious numerical assessment of the predictions of this model, it is absolutely necessary to take into account the one-loop radiative corrections to the light-neutrino mass matrix.

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E. H. Aeikens, P. M. Ferreira, W. Grimus, D. Jurčiukonis, L. Lavoura. 2020-09-28. Radiative seesaw corrections and charged-lepton decays in a model with soft flavour violation. https://doi.org/10.1007/jhep12(2020)122

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