Leptogenesis in the extension of the Zee-Babu model

We demonstrate that the extension of the Zee-Babu model can generate not only the small neutrino masses but also the baryon number asymmetry in the universe. In particular, we show that the scale of the singlet scalar responsible for the leptogenesis can be of order 1 TeV, that can be tested at the LHC and ILC. We also considered the possible minimal extension of this model to generate the dark matter.
Comment: 10 pages, 3 figures. The model has been revised by including a singlet scalar. The leptogenesis is due to the three-body decay of the scalar