Scalar-mediated double beta decay and LHC

TL;DR

This paper compares the potential of the LHC and double beta decay experiments to detect heavy scalar particles involved in neutrinoless double beta decay, highlighting the LHC's promising discovery prospects with current data.

Contribution

It provides a comparative analysis of LHC searches and double beta decay constraints for scalar-mediated neutrinoless double beta decay models, emphasizing the LHC's early discovery potential.

Findings

LHC can test significant parameter space with 20/fb data.

Current double beta decay limits do not exclude all LHC-accessible models.

LHC searches for dijets and leptoquarks are complementary to decay experiments.

Abstract

The decay rate of neutrinoless double beta decay could be dominated by short-range diagrams involving heavy scalar particles ("topology-II" diagrams). Examples are diagrams with diquarks, leptoquarks or charged scalars. Here, we compare the discovery potential for lepton number violating signals at the LHC with constraints from dijet and leptoquark searches and the sensitivity of double beta decay experiments, using three example models. We note that already with 20/fb the LHC will test interesting parts of the parameter space of these models, not excluded by current limits on double beta decay.