From the Trees to the Forest: A Review of Radiative Neutrino Mass Models

By Yi-Fu Cai, Juan Herrero garcia, M. Schmidt, Avelino Vicente, R. Volkas. Frontiers of Physics, 2017

331 citations recorded by the source corpus.

A plausible explanation for the lightness of neutrino masses is that neutrinos are massless 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/934ee763768e6894840320462dbb2d10d68651a9

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In Nuclear and High Energy Physics

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Citations in the corpus

• Vector boson fusion at multi-TeV muon colliders (2020, unknown): “[37, 153].”
• Flavor structures of charged fermions and massive neutrinos (2019, background): “In this regard it has been shown that a relatively natural generation of tiny Dirac neutrino masses is not impossible in some models involving extra spacial dimensions [470, 831, 832, 833, 834], supersymmetry or stringy symmetries [210, 835, 836, 837, 838], radiative mechanisms [220, 839, 840, 841, ”
• Lepton Number Violation: Seesaw Models and Their Collider Tests (2017, unknown): “[510] and the references therein for details.”
• Charged Lepton Flavour Violation: An Experimental and Theoretical Introduction (2017, background): “Moreover, in certain models neutrino masses only arise at the loop level: for a recent review of such radiative neutrino mass models, including their CLFV phenomenology, see [99].”
• Neutrino Oscillations and Non-standard Interactions (2017, unknown): “[236–239].”