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Type: Journal article
Title: Neutrino mass models: new classification and model-independent upper limits on their scale
Author: Herrero-García, J.
Schmidt, M.A.
Citation: European Physical Journal C: Particles and Fields, 2019; 79(11):938-1-938-10
Publisher: Springer Nature
Issue Date: 2019
ISSN: 1434-6044
Statement of
Juan Herrero-García, Michael A. Schmidt
Abstract: We propose a model-independent framework to classify and study neutrino mass models and their phenomenology. The idea is to introduce one particle beyond the Standard Model which couples to leptons and carries lepton number together with an operator which violates lepton number by two units and contains this particle. This allows to study processes which do not violate lepton number, while still working with an effective field theory. The contribution to neutrino masses translates to a robust upper bound on the mass of the new particle. We compare it to the stronger but less robust upper bound from Higgs naturalness and discuss several lower bounds. Our framework allows to classify neutrino mass models in just 20 categories, further reduced to 14 once nucleon decay limits are taken into account, and possibly to 9 if also Higgs naturalness considerations and direct searches are considered.
Rights: © The Author(s) 2019. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP³.
DOI: 10.1140/epjc/s10052-019-7465-1
Grant ID: ARC
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