Abstract
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.
Highlights
The classical Lepton Number Violating (LNV) signal searched for at the LHC is two same-sign leptons plus jets, first discussed as a possible signal for left-right symmetric models in [12], see [13]
Whether dijet or LNV signal are more constraining depends on the exact value of μ We have chosen the value of μ = mDQ/6, because, as the figure on the bottom right shows, negative results from LHC LQ and dijet searches would rule out partial 0νββ decay half-lives in this model below the current experimental limit for μ = mDQ/6, assuming g1 = g2 = gL
We have concentrated on three LNV models, chosen from the full list of possible scalar short-range contributions to 0νββ decay given in [8]
Summary
We will first recall the general setup of the topology-II contributions to 0νββ decay. These examples, chosen from the full list of possible scalar models given in [8], allow us to cover both the most optimistic and the most pessimistic cases for the sensitivity of future double beta decay experiments
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