Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-11-06
Phys.Rev. D67 (2003) 073004
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, latex, no figures; v2: discussions on inverted mass hierarchy scenario further clarified; to appear in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.67.073004
Neutrino Majorana masses and mixings can be generated from a dimension-5 operator within the standard model particle content. After a review of the mechanism of radiative enhancement of the mixing angle in a two-neutrino case, we consider three-flavour mass matrices of two-zero texture generated from such an operator and investigate the possibility of implementing the mechanism here. We observe that radiative magnification of only the solar angle is consistent with oscillation data on masses and mixings, and that too for nearly degenerate neutrinos, with two of them having opposite CP parities, while for hierarchical masses the mechanism does not work. In supersymmetry or in an extra-dimensional scenario the above features are qualitatively unchanged.
Bhattacharyya Gautam
Raychaudhuri Amitava
Sil Arunansu
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