Gauged B−3Lτ and baryogenesis

It has recently been shown that by extending the minimal standard model to include a right-handed partner to ντ, it is possible to gauge the B−3Lτ quantum number consistently. If we add two scalar triplets, one trivial (ξ1) and one nontrivial (ξ2) under B−3Lτ, it is possible also to have desirable neutrino masses and mixing for neutrino oscillations. At the same time, a lepton asymmetry can be generated in the early universe through the novel mechanism of the decay of the heavier ξ1 into the lighter ξ2 plus a neutral singlet (ζ0). This lepton asymmetry then gets converted into a baryon asymmetry at the electroweak phase transition.