Abstract:The implementation of seesaw mechanisms to give mass to neutrinos in the presence of an anomalyfree Uð1Þ X gauge symmetry is discussed in the context of minimal extensions of the standard model. It is shown that type-I and type-III seesaw mechanisms cannot be simultaneously implemented with an anomaly-free local Uð1Þ X , unless the symmetry is a replica of the well-known hypercharge. For combined type-I/II or type-III/II seesaw models it is always possible to find nontrivial anomaly-free charge assignments, wh… Show more
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