CP violations in predictive neutrino mass structures

Abstract

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We study the CP-violation effects from two types of neutrino mass matrices with (i) ......, and (ii) ......, which can be realized by the high-dimensional lepton number violating operators ...... and ......, respectively. In (i), the neutrino mass spectrum is in the normal ordering with the lightest neutrino mass within the range ....... Furthermore, for a given value of ......, there are two solutions for the two Majorana phases ...... and ......, whereas the Dirac phase ...... is arbitrary. For (ii), the parameters of ......, ......, ......, and ...... can be completely determined. We calculate the CP-violating asymmetries in neutrino-antineutrino oscillations for both mass textures of (i) and (ii), which are closely related to the CP-violating Majorana phases.