Journal
PRAMANA-JOURNAL OF PHYSICS
Volume 69, Issue 4, Pages 533-549Publisher
INDIAN ACAD SCIENCES
DOI: 10.1007/s12043-007-0154-x
Keywords
inverted hierarchical mass matrix; normal hierarchical mass matrix; tri-bimaximal mixings; solar angle
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We explore a novel possibility for lowering the solar mixing angle (theta(12)) from tri-bimaximal mixings, without sacrificing the predictions of maximal atmospheric mixing angle (theta(23) = 45 degrees) and zero reactor angle (theta(13) = 0 degrees) in the inverted and normal hierarchical neutrino mass models having 2-3 symmetry. This can be done through the identification of flavour twister term in the texture of neutrino mass matrix and the variation of such term leads to lowering of solar mixing angle. For the observed ranges of Delta m(21)(2) and Delta m(23)(2), we calculate the predictions on tan(2) theta(12) = 0.5, 0.45, 0.35 for different input values of the parameters in the neutrino mass matrix. We also observe a possible transition from inverted hierarchical model having even CP parity (Type-IHA) to inverted hierarchical model having odd CP parity (Type-IHB) in the first two mass eigenvalues, when there is a change in input values of parameters in the same mass matrix. The present work differs from the conventional approaches for the deviations from tri-bimaximal mixing, where the 2-3 symmetry is broken, leading to theta(23) not equal 45 degrees and.13 not equal 0 degrees.
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