The see-saw mechanism: neutrino mixing, leptogenesis and lepton flavor violation

Abstract

The see-saw mechanism to generate small neutrino masses is reviewed. After summarizing our current knowledge about the low energy neutrino mass matrix we consider reconstructing the see-saw mechanism. Low energy neutrino physics is not sufficient to reconstruct see-saw, a feature which we refer to as ``see-saw degeneracy''. Indirect tests of see-saw are leptogenesis and lepton flavor violation in supersymmetric scenarios, which together with neutrino mass and mixing define the framework of see-saw phenomenology. Several examples are given, both phenomenological and GUT-related. Variants of the see-saw mechanism like the type II or triplet see-saw are also discussed. In particular, we compare many general aspects regarding the dependence of LFV on low energy neutrino parameters in the extreme cases of a dominating conventional see-saw term or a dominating triplet term. For instance, the absence of mu -> e gamma or tau -> e gamma in the pure triplet case means that CP is conserved in neutrino oscillations. Scanning models, we also find that among the decays mu -> e gamma, tau -> e gamma and tau -> mu gamma the latter one has the largest branching ratio in (i) SO(10) type I see-saw models and in (ii) scenarios in which the triplet term dominates in the neutrino mass matrix.

arXiv comment26 pages, 7 figures. Expanded version of talk given at 10th Workshop In High Energy Physics Phenomenology (WHEPP 10), January 2008, Chennai, India. Typos corrected, comments and references added

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Cited by in corpus (12)

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• Minimal Textures in Seesaw Mass Matrices and their low and high Energy Phenomenology
• Lower Limits on $\mu \to e\gamma$ from new Measurements on $U_{e3}$
• Higgs triplets at like-sign linear colliders and neutrino mixing
• Running effects on neutrino parameters and l_i -> l_j gamma predictions in the triplet-extended MSSM
• Rescuing Quadratic Inflation
• Confronting Four Zero Neutrino Yukawa Textures with $N_2^{}$-dominated Leptogenesis
• Leptogenesis in a Hybrid Texture Neutrino Mass Model
• Some implications of lepton flavor violating processes in a supersymmetric Type II seesaw model at TeV scale
• Probing neutrino masses and tri-bimaximality with lepton flavor violation searches