Dirac or inverse seesaw neutrino masses with B - L gauge symmetry and S3 flavor symmetry
Abstract
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 S3 flavor symmetry.
- Publication:
-
Physics Letters B
- Pub Date:
- February 2015
- DOI:
- 10.1016/j.physletb.2014.12.049
- arXiv:
- arXiv:1411.5042
- Bibcode:
- 2015PhLB..741..217M
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 13 pages, Comments and References added, Conclusions Unchanged