Lepton Number Violation in TeV Scale See-Saw Extensions of the Standard Model

Abstract

The low-energy neutrino physics constraints on the TeV scale type I see-saw scenarios of neutrino mass generation are revisited. It is shown that lepton charge (L) violation, associated to the production and decays of heavy Majorana neutrinos N_{j} having masses in the range of M_j \sim (100 ÷1000) GeV and present in such scenarios, is hardly to be observed at ongoing and future particle accelerator experiments, LHC included, because of very strong constraints on the parameters and couplings responsible for the corresponding |ΔL| = 2 processes. If the heavy Majorana neutrinos N_j are observed and they are associated only with the type I mechanism, they will behave effectively like pseudo-Dirac fermions. Conversely, the observation of effects proving the Majorana nature of N_j would imply that these heavy neutrinos have additional relatively strong couplings to the Standard Model particles or that light neutrino masses compatible with the observations are generated by a mechanism other than see-saw (e.g., radiatively at one or two loop level) in which the heavy Majorana neutrinos N_j are nevertheless involved.

Contribution to the Proceedings of DISCRETE 2010- Symposium on Prospects in the Physics of Discrete Symmetries, 8 pages

References in corpus (9)

• Measurement of Neutrino Oscillation by the K2K Experiment
• Measurement of the solar neutrino capture rate with gallium metal. III: Results for the 2002--2007 data-taking period
• Unitarity of the Leptonic Mixing Matrix
• Non-Standard Neutrino Interactions with Matter from Physics Beyond the Standard Model
• TeV Scale See-Saw Mechanisms of Neutrino Mass Generation, the Majorana Nature of the Heavy Singlet Neutrinos and $\betabeta$-Decay
• Results from a search for the $0\nu \beta \beta$-decay of ${}^{130}Te$
• Neutrinoless double beta decay in seesaw models
• Majorana Neutrinos, Neutrino Mass Spectrum and the |<m>| ~ 0.001 eV Frontier in Neutrinoless Double Beta Decay
• Neutrinoless double beta decay and direct searches for neutrino mass

Cited by in corpus (6)

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• Minimal lepton flavor violating realizations of minimal seesaw models
• Lepton Number and Lepton Flavor Violation through Color Octet States
• LFV Higgs and $Z$-boson decays: leptonic CPV phases and CP asymmetries