Lepton number violation at the LHC with leptoquark and diquark

TL;DR

This paper proposes a model where lepton number violation at the LHC occurs via scalar leptoquarks and diquarks, producing distinctive same-sign leptons and jets, linking collider signals with neutrino mass suppression.

Contribution

It introduces a two-loop neutrino mass generation model involving scalar leptoquarks and diquarks, predicting observable lepton number violating signals at the LHC.

Findings

Diquark production at the LHC is feasible.

Lepton number violation signals are not suppressed.

Neutrino masses are consistent with the model constraints.

Abstract

We investigate a model in which tiny neutrino masses are generated at the two-loop level by using scalar leptoquark and diquark multiplets. The diquark can be singly produced at the LHC, and it can decay into a pair of leptoquarks through the lepton number violating interaction. Subsequent decays of the two leptoquarks can provide a clear signature of the lepton number violation, namely two QCD jets and a pair of same-signed charged leptons without missing energy. We show that the signal process is not suppressed while neutrino masses are appropriately suppressed.