Pure Leptonic Gauge Symmetry, Neutrino Masses and Dark Matter

Abstract

A possible extension of the Standard Model to include lepton number as local gauge symmetry is investigated. In such a model, anomalies are canceled by two extra fermions doublet. After leptonic gauge symmetry spontaneously broken, three active neutrinos may acquire non-zero Majorana masses through the modified Type-II seesaw mechanism. Constraints on the model from electro-weak precision measurements are studied. Due to the $Z_2$ discrete flavor symmetry, right-handed Majorana neutrinos can serve as cold dark matter candidate of the Universe. Constraint from dark matter relic abundance is calculated.

13 pages, 2 figures; typos corrected, comments and references added, to appear in Phys. Lett. B

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• Neutrino-Dark Matter Connections in Gauge Theories
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