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Discriminating neutrino mass models using type-II see-saw formula

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Abstract

An attempt has been made to discriminate theoretically the three possible patterns of neutrino mass models,viz., degenerate, inverted hierarchical and normal hierachical models, within the framework of Type-II see-saw formula. From detailed numerical analysis we are able to arrive at a conclusion that the inverted hierarchical model with the same CP phase (referred to as Type [IIA]), appears to be most favourable to survive in nature (and hence most stable), with the normal hierarchical model (Type [III]) and inverted hierarchical model with opposite CP phase (Type [IIB]), follow next. The degenerate models (Types [IA,IB,IC]) are found to be most unstable. The neutrino mass matrices which are obtained using the usual canonical see-saw 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 presence of the left-handed Higgs triplet within the framework of non-canonical see-saw formula (Type II). We then estimate a parameter (the so-called discriminator) which may represent the minimum degree of suppression of the extra term arising from the presence of left-handed Higgs triplet, so as to restore the good predictions on neutrino masses and mixings already acquired in Type-I see-saw model. The neutrino mass model is said to be favourable and hence stable when its canonical see-saw term dominates over the non-canonical (perturbative) term, and this condition is used here as a criterion for discriminating neutrino mass models.

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Authors and Affiliations

  1. The Abdus Salam International Centre for Theoretical Physics, Strada Costiera, 11, 31014, Trieste, Italy

    N. Nimai Singh

  2. Department of Physics, Cotton College, 781 001, Guwahati, India

    Mahadev Patgiri

  3. Department of Physics, Gauhati University, 781 014, Guwahati, India

    N. Nimai Singh & Mrinal Kumar Das

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  1. N. Nimai Singh
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  2. Mahadev Patgiri
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Singh, N.N., Patgiri, M. & Das, M.K. Discriminating neutrino mass models using type-II see-saw formula. Pramana - J Phys 66, 361–375 (2006). https://doi.org/10.1007/BF02704390

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  • DOI: https://doi.org/10.1007/BF02704390

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