Double beta decay and neutrino mass models

A bstract Neutrinoless double beta decay allows to constrain lepton number violating extensions of the standard model. If neutrinos are Majorana particles, the mass mechanism will always contribute to the decay rate, however, it is not a priori guaranteed to be the dominant contribution in all model...

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Bibliographic Details
Published in:The journal of high energy physics 2015-05, Vol.2015 (5), p.1-40, Article 92
Main Authors: Helo, J. C., Hirsch, M., Ota, T., dos Santos, F. A. Pereira
Format: Article
Language:English
Subjects:
Beta decay
Classical and Quantum Gravitation
Classification
Concretes
Decay rate
Elementary Particles
Gages
High energy physics
Neutrinos
Phenomenology
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
Standard model (particle physics)
String Theory
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Summary:A bstract Neutrinoless double beta decay allows to constrain lepton number violating extensions of the standard model. If neutrinos are Majorana particles, the mass mechanism will always contribute to the decay rate, however, it is not a priori guaranteed to be the dominant contribution in all models. Here, we discuss whether the mass mechanism dominates or not from the theory point of view. We classify all possible (scalar-mediated) short-range contributions to the decay rate according to the loop level, at which the corresponding models will generate Majorana neutrino masses, and discuss the expected relative size of the different contributions to the decay rate in each class. Our discussion is general for models based on the SM group but does not cover models with an extended gauge. We also work out the phenomenology of one concrete 2-loop model in which both, mass mechanism and short-range diagram, might lead to competitive contributions, in some detail.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP05(2015)092