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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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 Perfil; Santamaria, A. (Arcadi) Perfil
Aquest document és un/a article, creat/da en: 2012
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.

    Aparici Benages, Alberto Herrero García, Juan Andrés Rius Dionis, Nuria Santamaria, A. (Arcadi) 2012 On the nature of the fourth generation neutrino and its implications Journal of High Energy Physics 07 7 030-1 030-31
http://dx.doi.org/10.1007/JHEP07(2012)030
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