Non-zero image and CP-violation in inverse neutrino mass matrix Original Research Article

The generic predictions of inverse Majorana neutrino mass matrix, image with texture two zeros, in the basis where charged lepton mass matrix is diagonal, have been obtained for neutrino masses and mixings, especially, image and CP-violating phases. Such type of mass models is natural in the context of seesaw models with Dirac neutrino mass matrix, image, diagonal. Out of the fifteen possible texture two zeros patterns of the inverse neutrino mass matrix only seven are found to be compatible with the available data on neutrino masses and mixings including the latest T2K observation of non-zero image. It is, also, found that image is disallowed in the mass models investigated in the present work. While the neutrino mass matrices of type I and II are found to be necessarily CP-violating, type III is found to be CP-violating for a special case where image lies above maximality. The atmospheric mixing angle image is found to dictate the possible hierarchies in type I and II neutrino mass models. For type III, additional information regarding image will be required to rule out the inverted hierarchy (IH). A maximal image is found to be disallowed in all types of texture two zero image Ansätze.