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Leptogenesis and Low Energy CP Violation in Neutrino Physics

Show simple item record Pascoli, Silvia en_US Petcov, Serguey T. en_US Riotto, Antonio en_US 2006-12-07T15:48:44Z en_US 2011-09-07T20:27:07Z 2006-12-07T15:48:44Z en_US 2011-09-07T20:27:07Z 2006-12-07T15:48:44Z en_US
dc.identifier.citation Nucl. Phys. B 774 (2007) 1-52 en_US
dc.identifier.uri en_US
dc.description.abstract Taking into account the recent progress in the understanding of the lepton flavour effects in leptogenesis, we investigate in detail the possibility that the CP-violation necessary for the generation of the baryon asymmetry of the Universe is due exclusively to the Dirac and/or Majorana CP-violating phases in the PMNS neutrino mixing matrix U, and thus is directly related to the low energy CP-violation in the lepton sector (e.g., in neutrino oscillations, etc.). We first derive the conditions of CP-invariance of the neutrino Yukawa couplings lambda in the see-saw Lagrangian, and of the complex orthogonal matrix R in the ``orthogonal'' parametrisation of lambda. We show, e.g. that under certain conditions i) real R and specific CP-conserving values of the Majorana and Dirac phases can imply CP-violation, and ii) purely imaginary R does not necessarily imply breaking of CP-symmetry. We study in detail the case of hierarchical heavy Majorana neutrino mass spectrum, presenting results for three possible types of light neutrino mass spectrum: i) normal hierarchical, ii) inverted hierarchical, and iii) quasi-degenerate. Results in the alternative case of quasi-degenerate in mass heavy Majorana neutrinos, are also derived. The minimal supersymmetric extension of the Standard Theory with right-handed Majorana neutrinos and see-saw mechanism of neutrino mass generation is discussed as well. We illustrate the possible correlations between the baryon asymmetry of the Universe and i) the rephasing invariant J_CP controling the magnitude of CP-violation in neutrino oscillations, or ii) the effective Majorana mass in neutrinoless double beta decay, in the cases when the only source of CP-violation is respectively the Dirac or the Majorana phases in the neutrino mixing matrix. en_US
dc.format.extent 616870 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries SISSA;71/2006/EP en_US
dc.relation.ispartofseries;hep-ph/0611338 en_US
dc.relation.uri 10.1016/j.nuclphysb.2007.02.019 en_US
dc.title Leptogenesis and Low Energy CP Violation in Neutrino Physics en_US
dc.type Preprint en_US
dc.contributor.department Elementary Particle Theory en_US
dc.contributor.area Physics en_US

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