Abstract
The various diagrams leading to neutrinoless double beta decay in the left-right symmetric model have different relative magnitudes, depending on the scale of new physics. Neutrinos acquire mass from both type I and/or type II seesaw terms, making an unambiguous analysis difficult. We study the half-life for double beta decay in the case of type II and type I dominance, in the former case including interference terms. If the heavy neutrinos of the type I seesaw model are at the TeV scale, certain processes can be enhanced. In particular, there are regions of parameter space in which the so-called λ-and η-diagrams can give sizable contributions to the half-life for the decay. We perform a detailed study of one such scenario, paying careful attention to constraints from lepton flavour violation.
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Barry, J., Rodejohann, W. Lepton number and flavour violation in TeV-scale left-right symmetric theories with large left-right mixing. J. High Energ. Phys. 2013, 153 (2013). https://doi.org/10.1007/JHEP09(2013)153
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DOI: https://doi.org/10.1007/JHEP09(2013)153