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On the nature of the fourth generation neutrino and its implications
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On the nature of the fourth generation neutrino and its implications
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| Aparici Benages, Alberto; Herrero García, Juan Andrés; Rius Dionis, Nuria; Santamaria, Arcadi | |||
| Aquest document és un/a article, creat/da en: 2012 | |||
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| We consider the neutrino sector of a Standard Model with four generations. While the three light neutrinos can obtain their masses from a variety of mechanisms with or without new neutral fermions, fourth-generation neutrinos need at least one new relatively light right-handed neutrino. If lepton number is not conserved this neutrino must have a Majorana mass term whose size depends on the underlying mechanism for lepton number violation. Majorana masses for the fourth-generation neutrinos induce relative large two-loop contributions to the light neutrino masses which could be even larger than the cosmological bounds. This sets strong limits on the mass parameters and mixings of the fourth-generation neutrinos. | |||
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