科研之友
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摘要
Many studies have been made on extensions of the standard model with B - L gauge symmetry. The addition of three singlet (right-handed) neutrinos renders it anomaly-free. It has always been assumed that the spontaneous breaking of B - L is accomplished by a singlet scalar field carrying two units of B - L charge. This results in a very natural implementation of the Majorana seesaw mechanism for neutrinos. However, there exists in fact another simple anomaly-free solution which allows Dirac or inverse seesaw neutrino masses. We show for the first time these new possibilities and discuss an application to neutrino mixing with S-3 flavor symmetry.
- 出版日期2015-2-4
