Decomposition of short-range decay operators at one-loop level
arXiv:2110.15347 · doi:10.1007/JHEP12(2021)169
Abstract
We perform a systematical study of the dimension-9 short-range decay operators at one-loop level. There are only six genuine topologies which generate eight diagrams, and the recipe to identify the possible one-loop realizations of the decay operators is sketched. Certain hypercharge assignments are excluded by the absence of tree-level diagrams in a genuine one-loop model. The mediators of each decomposition can generate Majorana neutrino masses which are discussed up to two-loop level. We present an example of decay model in which the neutrino masses are generated at two-loop level, and the short-range contribution can be comparable with the mass mechanism in some region of parameter space.
arXiv comment41 pages, 17 figures
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