UC Irvine

We propose a theory in which the Standard Model gauge symmetry is extended by a new SU(2) group acting nontrivially on the lepton sector which is spontaneously broken at the TeV scale. Under this SU(2) the ordinary leptons form doublets along with new lepton partner fields. This construction naturally contains a dark matter candidate, the partner of the right-handed neutrino, stabilized by a residual global U(1)χ symmetry. We show that one can explain baryogenesis through an asymmetric dark matter scenario, in which generation of related asymmetries in the dark matter and baryon sectors is driven by the SU(2) instantons during a first order phase transition in the early Universe.