2013/03/31 by James Barry, Werner Rodejohann · 2 citations
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1007/jhep09(2013)153
published as JHEP 1309:153, 2013 · 50 pages, 13 figures. Minor changes in text. Appendices added: (a) half-life correlations for Ge and Xe; (b) explicit numerical example. Results unchanged. Matches version published in JHEP
arxiv created 2013/09/30 · arxiv updated 2013/10/01
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 lambda- and eta-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.