2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211284We study thermal leptogenesis from decays of the electroweak triplets that mediate neutrino masses in type-II and type-III see-saw. We find that Sommerfeld corrections reduce the baryon asymmetry by ~30%, and that successful leptogenesis needs triplets heavier than 1.6 TeV, beyond the discovery reach of LHC.12 pages, 4 figures, final version. The group theory of the non-abelian Sommerfeld effect presented in this paper can be relevant for scenarios of Dark Matter charged under new dark gauge groups, as suggested by recent dataHigh Energy Physics - Phenomenologytext