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Abstract: The neutrino oscillation data find a good approximation in the so-calledtri-bimaximal pattern. Recently a paper appeared showing that also thebimaximal pattern, which is already ruled out by the measurements, could be avery good starting point in order to describe the lepton mixing. In this paperI review both the flavour structures and then I present an explicit flavourmodel based on the discrete group S4, in which the PMNS mixing matrix is of thebimaximal form in first approximation and after it receives corrections whichbring it in agreement with the data. The resulting spectrum of light neutrinosshows a moderate normal hierarchy and is compatible, within large ambiguities,with the constraints from leptogenesis as an explanation of the baryonasymmetry in the Universe.



Author: Luca Merlo

Source: https://arxiv.org/



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