Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-08-26
Phys.Lett.B671:60-65,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version accepted for publication in Phys. Lett. B; Addendum, in which the numerical analysis is extended to the case of comple
Scientific paper
10.1016/j.physletb.2008.11.047
The CP-violation necessary for the generation of the baryon asymmetry of the Universe $Y_B$ in the "flavoured" leptogenesis scenario can arise from the "low energy" PMNS neutrino mixing matrix $U$ and/or from the "high energy" part of neutrino Yukawa couplings, which can mediate CP-violating phenomena only at some high energy scale. The possible interplay between these two types of CP-violation is analysed. The type I see-saw model with three heavy right-handed Majorana neutrinos having hierarchical spectrum is considered. We show that in the case of inverted hierarchical light neutrino mass spectrum, there exist regions in the corresponding leptogenesis parameter space where the relevant "high energy" phases have large CP-violating values, but the purely "high energy" contribution in $Y_B$ plays a subdominant role in the production of baryon asymmetry compatible with the observations. In some of these regions the purely "high energy" contribution in $Y_B$ is so strongly suppressed that one can have successful leptogenesis only if the requisite CP-violation is provided by the Majorana phase(s) in the neutrino mixing matrix.
Molinaro Emiliano
Petcov Serguey T.
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