Four Light Neutrinos in Singular Seesaw Mechanism with Abelian Flavor Symmetry

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  • 16 December 1998
Abstract
The four light neutrino scenario, which explains the atmosphere, solar and LSND neutrino experiments, is studied in the framework of singular seesaw mechanism. By taking the Dirac neutrino mass matrix to be also singular, the right-handed neutrino Majorana mass can be at 10^{14} GeV scale. Abelian flavor symmetry is used to produce the required neutrino mass pattern. Maximal mixings between the nu_mu-nu_tau and nu_e-nu_s are attributed to the atmosphere neutrino anomaly and solar neutrino deficit, respectively. The implication in the other fermion masses is also discussed.

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