Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-04-20
Phys.Lett. B486 (2000) 134-139
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, no figure
Scientific paper
10.1016/S0370-2693(00)00718-8
The mass matrix of three Majorana neutrinos of equal mass is not necessarily proportional to the identity matrix, but expressible in terms of two angles and one phase. We discuss how such a mass matrix may be stable or unstable against radiative corrections. We then propose a model with additional explicit breaking of the threefold degeneracy to account for the atmospheric neutrino data, while the radiative breaking explains the solar neutrino data, using the large-angle Mikheyev-Smirnov-Wolfenstein solution. Our model requires a nonzero effective $\nu_e$ mass for neutrinoless double beta decay close to the present experimental upper limit of 0.2 eV.
Adhikari Rathin
Ma Ernest
Rajasekaran Guruswamy
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