Scalar-mediated double beta decay and LHC

The decay rate of neutrinoless double beta (0νββ) decay could be dominated by lepton number violating (lnv) short-range diagrams involving only heavy scalar intermediate particles, known as “topology-ii” diagrams. examples are diagrams with diquarks, leptoquarks or charged scalars. here, we compare the lnv discovery potentials of the lhc and 0νββ-decay experiments, resorting to three example models, which cover the range of the optimistic-pessimistic cases for 0νββ decay. we use the lhc constraints from dijet as well as leptoquark searches and find that already with 20/fb the lhc will test interesting parts of the parameter space of these models, not excluded by the current limits on 0νββ-decay.