Abstract
We perform a detailed analysis of the one-loop corrections to the light neutrino mass matrix within low scale type I seesaw extensions of the Standard Model and their implications in experimental searches for neutrinoless double beta decay. We show that a sizable contribution to the effective Majorana neutrino mass from the exchange of heavy Majorana neutrinos is always possible, provided one requires a fine-tuned cancellation between the tree-level and one-loop contribution to the light neutrino masses. We quantify the level of fine-tuning as a function of the seesaw parameters and introduce a generalisation of the Casas-Ibarra parametrization of the neutrino Yukawa matrix, which easily allows to include the one-loop corrections to the light neutrino masses.
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Lopez-Pavon, J., Molinaro, E. & Petcov, S.T. Radiative corrections to light neutrino masses in low scale type I seesaw scenarios and neutrinoless double beta decay. J. High Energ. Phys. 2015, 30 (2015). https://doi.org/10.1007/JHEP11(2015)030
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DOI: https://doi.org/10.1007/JHEP11(2015)030