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Phenomenology

Asymmetric Dark Matter and Baryogenesis fromSU(2)??

We propose a theory in which the Standard Model gauge symmetry is extended by a newSU(2)??group acting nontrivially on the lepton sector which is spontaneously broken at the TeV scale. Under thisSU(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 globalU(1)?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 theSU(2)??instantons during a first order phase transition in the early universe.

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