2003/11/30 by R. González Felipe, R. Gonzalez Felipe, F. R. Joaquim +2 · 5 citations
Physics and Astronomy · #Asymmetry #Baryon asymmetry #Biology #CP violation #Cosmology and Gravitation Theories #Degeneracy (biology) #Leptogenesis #Lepton #Lepton number #MAJORANA #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Seesaw mechanism #Seesaw molecular geometry #Standard Model (mathematical formulation) #Sterile neutrino #hep-ph
paper · pdf · doi:10.1103/physrevd.70.085009
published as Phys.Rev.D70:085009,2004 · 6 pages, 2 figures, uses RevTeX4, calculations improved, comments added
arxiv created 2004/09/15 · openalex publication_date 2004/10/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the possibility that the baryon asymmetry of the Universe is generated in a minimal seesaw scenario where two right-handed Majorana neutrinos with degenerate masses are added to the standard model particle content. In the usual framework of thermal leptogenesis, a nonzero CP asymmetry can be obtained through the mass splitting induced by the running of the heavy Majorana neutrino masses from their degeneracy scale down to the seesaw scale. Although, in the light of the present neutrino oscillation data, the produced baryon asymmetry turns out to be smaller than the experimental value, the present mechanism could be viable in simple extensions of the standard model.