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Can new generations explain neutrino masses?

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	Herrero García, Juan Andrés; Rius Dionis, Nuria Perfil; Aparici Benages, Alberto; Santamaria, Arcadi Perfil
	This document is a Comunicación/PonenciaDate2011
	Este documento está disponible también en : http://hdl.handle.net/10550/59055
	In this talk we explore the possibility that the smallness of the observed neutrino masses is naturally understood in a modified version of the standard model with N extra generations of fermions and N right-handed neutrinos, in which light neutrino masses are generated at two loops. We find that with N = 1 it is not possible to fit the observed spectrum of masses and mixings while with N = 2 it is. Within this extension, we analyse the parameters which are allowed and the possible phenomenological signals of the model in future experiments. Contribution to the proceedings of Les Rencontres de Moriond EW 2011, Young Scientist Forum.
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