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Type: Journal article
Title: From the trees to the forest: a review of radiative neutrino mass models
Author: Cai, Y.
Herrero-Garcia, J.
Schmidt, M.
Vicente, A.
Volkas, R.
Citation: Frontiers in Physics, 2017; 5:63-1-63-56
Publisher: Frontiers Media S.A.
Issue Date: 2017
ISSN: 2296-424X
Statement of
Yi Cai, Juan Herrero García, Michael A. Schmidt, Avelino Vicente and Raymond R. Volkas
Abstract: A plausible explanation for the lightness of neutrinomasses is that neutrinos aremassless at tree level, with their mass (typically Majorana) being generated radiatively at one or more loops. The new couplings, together with the suppression coming from the loop factors, imply that the new degrees of freedom cannot be too heavy (they are typically at the TeV scale). Therefore, in these models there are no large mass hierarchies and they can be tested using different searches, making their detailed phenomenological study very appealing. In particular, the new particles can be searched for at colliders and generically induce signals in lepton-flavor and lepton-number violating processes (in the case of Majorana neutrinos), which are not independent from reproducing correctly the neutrino masses and mixings. The main focus of the review is on Majorana neutrinos. We order the allowed theory space from three different perspectives: (i) using an effective operator approach to lepton number violation, (ii) by the number of loops at which the Weinberg operator is generated, (iii) within a given loop order, by the possible irreducible topologies. We also discuss in more detail some popular radiative models which involve qualitatively different features, revisiting their most important phenomenological implications. Finally, we list some promising avenues to pursue.
Keywords: Neutrino masses; lepton flavor violation; lepton number violation; beyond the standard model; effective field theory; model building; LHC; dark matter
Description: Published: 04 December 2017
Rights: Copyright © 2017 Cai, Herrero García, Schmidt, Vicente and Volkas. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
RMID: 0030085639
DOI: 10.3389/fphy.2017.00063
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Appears in Collections:Physics publications

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