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Prog. Theor. Phys. Vol. 100 No. 6 (1998) pp. 1239-1250

[ Full Text PDF : FREE ACCESS (701K) ]

Sterile Neutrinos in a Grand Unified Model

Masako Bando and Koichi Yoshioka*

Aichi University, Miyoshi-cho, Aichi 470-02, Japan
*Department of Physics, Kyoto University, Kyoto 606-8502, Japan

(Received June 24, 1998)

Abstract:

Recent experimental results indicating the existence of neutrino oscillations may strongly suggest that at least one more light neutrino species is required in order to reconcile the existing data. In simple GUT frameworks, this fact seems not to preserve the parallelism between quarks and leptons. In this paper, we investigate an SO(10) grand unified model with a pair of extra generations in addition to the known three generations. Using the GUT relations, the obtained neutrino mass matrix naturally indicates that one of the SU(2)L singlet (sterile) neutrinos is very light and has a large mixing with the muon neutrino. This can explain the atmospheric neutrino anomaly, and the existence of the hot dark matter neutrino is also indicated. The solar neutrino problem can be solved by considering the mixing with the muon neutrino consistently with quark mixing, namely, the Cabibbo angle.


URL : http://ptp.ipap.jp/link?PTP/100/1239/
DOI : 10.1143/PTP.100.1239

[ Full Text PDF : FREE ACCESS (701K) ] Citation:

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