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We consider the baryogenesis picture in the Zee-Babu model. Our analysisshows that electroweak phase transition (EWPT) in the model is a first-orderphase transition at the $100$ GeV scale, its strength ranges from 1 to 4.15 andthe masses of charged Higgs boson are smaller than $300$ GeV. The EWPT isstrengthened by only the new bosons and this strength is enhanced by arbitrary$\xi$ gauge. However, the $\xi$ gauge does not break the first-order EWPT or,in other words, the $\xi$ gauge is not the cause of the EWPT. This leads to thefact that the calculation of EWPT in Landau gauge is enough; and the latter mayprovide baryon-number violation (B-violation) necessary for baryogenesis in therelationship with nonequilibrium physics in the early universe.

Baryogenesis in the Zee-Babu model with arbitrary $\xi$ gauge