Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation

Abstract

We consider the possibility to detect right-handed neutrinos, which are mostly singlets of the Standard Model gauge group, at future accelerators. Substantial mixing of these neutrinos with the active neutrinos requires a cancellation of different contributions to the light neutrino mass matrix at the level of 10^{-8}. We discuss possible symmetries behind this cancellation and argue that they always lead to conservation of total lepton number. Light neutrino masses can be generated by small perturbations violating these symmetries. In the most general case, LHC physics and the mechanism of neutrino mass generation are essentially decoupled; with additional assumptions, correlations can appear between collider observables and features of the neutrino mass matrix.

v2: 23 pages, minor clarifications, references updated, version to appear in PRD

References in corpus (3)

• Phenomenology with Massive Neutrinos
• Broadening the Higgs Boson with Right-Handed Neutrinos and a Higher Dimension Operator at the Electroweak Scale
• Discriminating among the theoretical origins of new heavy Majorana neutrinos at the CERN LHC

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• A Compromise between Neutrino Masses and Collider Signatures in the Type-II Seesaw Model
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• TeV-scale Type-II Seesaw Models and Possible Collider Signatures