Vacuum solutions of neutrino anomalies through a softly broken U(1) symmetry |
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Authors: | AS Joshipura SD Rindani |
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Institution: | (1) Theoretical Physics Group, Physical Research Laboratory, Navarangpura, Ahmedabad, 380 009, India , IN |
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Abstract: | We discuss an extended model which naturally leads to mass scales and mixing angles relevant for understanding both the solar and atmospheric neutrino
anomalies in terms of the vacuum oscillations of the three known neutrinos. The model uses a softly broken –– symmetry and contains a heavy scale GeV. The –– symmetric neutrino masses solve the atmospheric neutrino anomaly while breaking of –– generates the highly suppressed radiative mass scale needed for the vacuum solution of the solar neutrino problem. All the neutrino masses in the model are inversely related
to , thus providing seesaw-type of masses without invoking any heavy right-handed neutrinos. The possible embedding of the model
into an SU(5) grand unified theory is discussed.
Received: 5 August 1999 / Revised version: 18 November 1999 / Published online: 6 April 2000 |
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Keywords: | |
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