Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-10-15
Acta Phys.Polon.B40:3179-3184,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 1 figure; Proceeding for the XXXIII International Conference of Theoretical Physics: ``USTRON09 -- Matter to the Deep
Scientific paper
The neutrino oscillation data find a good approximation in the so-called tri-bimaximal pattern. Recently a paper appeared showing that also the bimaximal pattern, which is already ruled out by the measurements, could be a very good starting point in order to describe the lepton mixing. In this paper I review both the flavour structures and then I present an explicit flavour model based on the discrete group S4, in which the PMNS mixing matrix is of the bimaximal form in first approximation and after it receives corrections which bring it in agreement with the data. The resulting spectrum of light neutrinos shows a moderate normal hierarchy and is compatible, within large ambiguities, with the constraints from leptogenesis as an explanation of the baryon asymmetry in the Universe.
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