2008/03/31 by Emiliano Molinaro, E. Molinaro, S. T. Petcov · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Asymmetry #Baryon asymmetry #CP violation #Leptogenesis #Lepton #MAJORANA #Mass matrix #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pontecorvo–Maki–Nakagawa–Sakata matrix #Sterile neutrino #Yukawa potential #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-009-0985-3
published as Eur.Phys.J.C61:93-109,2009 · Results unchanged; comments and references added; version to be puplished in Eur.Phys.J.C
arxiv created 2009/03/09 · openalex publication_date 2009/03/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We analyse within the "flavoured" leptogenesis scenario of baryon asymmetry generation, the interplay of the "low energy" CP-violation, originating from the PMNS neutrino mixing matrix U, and the "high energy" CP-violation which can be present in the matrix of neutrino Yukawa couplings, λ, and can manifest itself only in "high" energy scale processes. The type I see-saw model with three heavy right-handed Majorana neutrinos having hierarchical spectrum is considered. The "orthogonal" parametrisation of the matrix of neutrino Yukawa couplings, which involves a complex orthogonal matrix R, is employed. In this approach the matrix R is the source of "high energy" CP-violation. Results for normal hierarchical (NH) and inverted hierarchical (IH) light neutrino mass spectrum are derived in the case of decoupling of the heaviest RH Majorana neutrino. It is shown that taking into account the contribution to YB due to the CP-violating phases in the neutrino mixing matrix U can change drastically the predictions for YB, obtained assuming only "high energy" CP-violation from the R-matrix is operative in leptogenesis. In the case of IH spectrum, in particular, there exist significant regions in the corresponding parameter space where the purely "high energy" contribution in YB plays a subdominant role in the production of baryon asymmetry compatible with the observations.