Epsilon-Type contribution to baryon asymmetry from colored higgs triplets
In scenarios where the cosmological baryon asymmetry is generated in the decay of heavy colored Higgs triplets at the one-loop level (at least two triplets are needed), it is shown that in addition to the conventional triangle loop (ε'-type effect), a new kind of diagram must be considered. This new type of diagram has its origin in the mixing of the two Higgs fields (ε-type effect). The mixing of the two Higgs fields violates CP provided they have at least two common decay channels. For small mixing angles, the new contribution can be bigger than the conventional one.
Botella Olcina, Francisco J. Roldán García, Jesús 1991 Epsilon-Type contribution to baryon asymmetry from colored higgs triplets Physical Review D 44 4 966 969