Enlarging the window for radiative leptogenesis

We investigate the scenario of resonant thermal leptogenesis, in which the leptonic asymmetries are generated through renormalization group corrections induced at the leptogenesis scale. In the framework of the standard model extended by three heavy Majorana neutrinos with masses M1=M2≪M3 at some hi...

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Bibliographic Details
Published inPhysics letters. B Vol. 633; no. 2-3; pp. 336 - 344
Main Authors Branco, G.C., González Felipe, R., Joaquim, F.R., Nobre, B.M.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 09.02.2006
Elsevier Science
Subjects
Exact sciences and technology
Nuclear physics
Physics
The physics of elementary particles and fields
Heavy neutrino
Elementary particle mass
Lepton production
Asymmetry
Neutrino oscillations
Neutrino mass
Standard model
CP invariance
Degeneration
Mass spectra
Majorana theory
Corrections
Renormalization group
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Summary:We investigate the scenario of resonant thermal leptogenesis, in which the leptonic asymmetries are generated through renormalization group corrections induced at the leptogenesis scale. In the framework of the standard model extended by three heavy Majorana neutrinos with masses M1=M2≪M3 at some high scale, we show that the mass splitting and CP-violating effects induced by renormalization group corrections can lead to values of the CP asymmetries large enough for a successful leptogenesis. In this scenario, the low-energy neutrino oscillation data can also be easily accommodated. The possibility of having an underlying symmetry behind the degeneracy in the right-handed neutrino mass spectrum is also discussed.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2005.11.070