Leptogenesis in the Composite Higgs Models

We argue that within minimal composite Higgs model an approximate discrete $$Z_{2}$$ symmetry can result in the small mass of the electron and tiny masses of the left-handed neutrinos. Such symmetry may also lead to the composite fermions with masses 1–2 TeV. The out-of equilibrium decays of Majorana fermion into these composite fermions and Higgs doublet can generate the appropriate baryon asymmetry.