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hep-ph/0406075 Discriminating neutrino mass models using Type II

By Seesaw Formula, N. Nimai Singh A, Mahadev Patgiri B and Mrinal Kumar Das C

Abstract

In this paper we propose a kind of natural selection which can discriminate the three possible neutrino mass models, namely the degenerate, inverted hierarchical and normal hierachical models, using the framework of Type II seesaw formula. We arrive at a conclusion that the inverted hierarchical model appears to be most favourable whereas the normal hierarchical model follows next to it. The degenerate model is found to be most unfavourable. The neutrino mass matrices which are obtained using the usual canonical seesaw formula (Type I), and which also give almost good predictions of neutrino masses and mixings consistent with the latest neutrino oscillation data, are re-examined in the light of non-canonical seesaw formula (Type II). We then estimate a parameter γ which represents the minimum degree of suppression of the extra term arising from the left-handed Higgs triplet, so as to restore the good predictions on neutrino masses and mixings already had in Type I seesaw model. 1 Regular Associate of ICTP

Year: 2004
OAI identifier: oai:CiteSeerX.psu:10.1.1.345.9990
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