Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/260
Title: Revisiting bimaximal neutrino mixing in a model with S-4 discretesymmetry
Authors: Altarelli, Guido
Feruglio, Ferruccio
Merlo, Luca
Keywords: quark-lepton complementarity
a(4) family symmetry
flavor symmetry
mass matrix
unified
theories
mns matrices
Issue Date: May-2009
Publisher: International School for Advanced Studies (SISSA)
Source: 36 (Source: SPIRES, Date 7.7.2010)
Abstract: In view of the fact that the data on neutrino mixing are stillcompatible with a situation where Bimaximal mixing is valid in firstapproximation and it is then corrected by terms of O(lambda(C)) (withlambda(C) being the Cabibbo angle), arising from the diagonalization ofthe charged lepton masses, such that delta sin(2)theta(12) similar tosin theta(13) similar to O(lambda(C)) while delta sin(2)theta(23)similar to O(lambda(2)(C)), we construct a model based on the discretegroup S 4 where those properties are naturally realized. The model issupersymmetric in 4-dimensions and the complete flavour group is S-4 xZ(4) x U(1)(FN), which also allows to reproduce the hierarchy of thecharged lepton spectrum. The only fine tuning needed in the model is toreproduce the small observed value of r = Delta m(sun)(2)/Deltam(atm)(2). Once the relevant parameters are set to accommodate r thenthe spectrum of light neutrinos shows a moderate normal hierarchy andis compatible, within large ambiguities, with the constraints fromleptogenesis as an explanation of the baryon asymmetry in the Universe.
Description: Citazioni 36 (Source: SPIRES, Date 7.7.2010)
URI: http://hdl.handle.net/2307/260
ISSN: 1126-6708
DOI: 10.1088/1126-6708/2009/05/020
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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