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Lepton number violation and ‘Diracness’ of massive neutrinos composed of Majorana states

Majorana neutrinos naturally lead to a lepton number violation (LNV). A superposition of Majorana states can mimic Dirac-type neutrinos, leading to lepton number conservation. Using the example of specific observables related to high- and low-energy processes, we demonstrate how the strength of LNV...

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Bibliographic Details
Published in:Physical review. D 2016-06, Vol.93 (11), Article 113017
Main Authors: Gluza, Janusz, Jeliński, Tomasz, Szafron, Robert
Format: Article
Language:English
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Summary:Majorana neutrinos naturally lead to a lepton number violation (LNV). A superposition of Majorana states can mimic Dirac-type neutrinos, leading to lepton number conservation. Using the example of specific observables related to high- and low-energy processes, we demonstrate how the strength of LNV correlates with neutrino parameters, such as CP phases, flavor mixings, and mass ratios. We stress the coaction of low- and high-energy studies for quantitatively testing phenomenological models. Second, we conclude that in order to fully study the role of heavy neutrinos in the search for new physics signals, a departure from trivial scenarios assuming degeneracy in mass and no flavor mixing or CP phases becomes necessary for a proper physical analysis.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.93.113017