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Naturalness, Vacuum Stability and Leptogenesis in the Minimal Seesaw Model
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The right-handed neutrinos within the type-I seesaw mechanism can induce large radiative corrections to the Higgs mass, and naturalness arguments can then be used to set limits on their mass scale and Yukawa couplings. Driven by minimality, we consider the presence of two degenerate right-handed neutrinos. We compare the limits from naturalness with the ones from the stability of the electroweak vacuum and from lepton flavor violation. Implications from neutrinoless double beta decay are also discussed and renormalization effects for the light neutrino parameters are presented. Adding small perturbations to the degenerate heavy neutrino spectrum allows for successful leptogenesis.
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Flavoured leptogenesis and ${\rm CP}^{\mu\tau}$ symmetry
In CPmu-tau symmetric seesaw models, flavoured leptogenesis works with M2/M1 as low as 4.7, lowering the old lower bound on M1 to about 7.5e9 GeV and allowing N2-dominated scenarios in roughly a quarter of the paramet...
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