Dark matter and baryogenesis from non-Abelian gauged lepton number

摘要

A simple model is constructed based on the gauge symmetry SU(3)(c) x SU(2)(L) x U(1)(y) X SU(2)(l), with only the leptons transforming nontrivially under SU(2)(l). The extended symmetry is broken down to the Standard Model gauge group at TeV-scale energies. We show that this model provides a mechanism for baryogenesis via leptogenesis in which the lepton number asymmetry is generated by SU(2)(l) instantons. The theory also contains a dark matter candidate - the SU(2)(l) partner of the right-handed neutrino.