Three active and two sterile neutrinos in an E6 model of diquark baryogenesis

In the U( 1)(N) extension of the supersymmetric standard model with E6 particle content, the heavy singlet superfield N may decay into a quark and a diquark as well as an antiquark and an antidiquark, thus creating a baryon asymmetry of the Universe. We show how the three doublet and two singlet neutrinos in this model acquire mass from physics at the TeV scale without the benefit of using N as a heavy right-handed neutrino. Specifically, the active neutrinos get masses via the bilinear term muLX(c) which conserves R-parity. and via the nonzero masses of the sterile neutrinos. The existence of the latter may be probed via their branching fraction from Z' decay. The neutrino mass matrix C may be (partially) reconstructed from the decays of the predicted new lepton doublets X and X-c.