Five of the seven two-zero texture Majorana neutrino mass matrices are in severe tension with cosmology and neutrinoless double beta decay bounds under a NuFit 6.0 scan, while A1 and A2 remain viable and predict small lightest neutrino masses.
Texture specific mass matrices with Dirac neutrinos and their implications
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abstract
Considering Dirac neutrinos and Fritzsch-like texture 6 zero and 5 zero mass matrices, detailed predictions for cases pertaining to normal/inverted hierarchy as well as degenerate scenario of neutrino masses have been carried out. All the cases considered here pertaining to inverted hierarchy and degenerate scenario of neutrino masses are ruled out by the existing data. For the normal hierarchy cases, the lower limit of m_nu_1 and of s_13 as well as the range of Dirac-like CP violating phase delta_l would have implications for the texture specific cases considered here.
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Revisiting the two-zero texture Majorana neutrino mass matrix
Five of the seven two-zero texture Majorana neutrino mass matrices are in severe tension with cosmology and neutrinoless double beta decay bounds under a NuFit 6.0 scan, while A1 and A2 remain viable and predict small lightest neutrino masses.