Sterile Neutrinos in a Grand Unified Model

Details Sterile Neutrinos in a Grand Unified Model Sterile Neutrinos in a Grand Unified Model

1998-06-18

arxiv.org/abs/hep-ph/9806400v1

Prog.Theor.Phys. 100 (1998) 1239-1250

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 5 eps figures

Scientific paper

10.1143/PTP.100.1239

The recent experimental results indicating the neutrino oscillations may strongly suggest that at least one more light neutrino species is required in order to reconcile the existing data. In the simple GUT frameworks, this fact seems difficult to preserve the parallelism between quarks and leptons. In this letter, we investigate an SO(10) grand unified model with a pair of extra generations in addition to the known three ones. Using the GUT relations, the obtained neutrino mass matrix naturally indicates that one of the SU(2) singlet (sterile) neutrino is very light and has large mixing with muon neutrino, which can explain the atmospheric neutrino anomaly, and the hot dark matter neutrino is also provided. The solar neutrino problem can be solved by the mixing with muon neutrino consistently with quark mixing, namely, the Cabibbo angle.

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