Searching for light new physics at the LHC via lepton-number violation

Abstract

We study the collider phenomenology of a simplified model containing a right-handed W in which the WR couples predominantly to the third generation in the quark sector. The model also includes a light Majorana neutrino, with M1 ∼ mathcal{O}(100) GeV, giving rise to lepton-number-violating signatures that are visible at the LHC. Taking into account all the searches from the LHC and Tevatron, we find that this WR can still be as light as MR ∼ 300 GeV. We show that this type of new physics, and others like it, can be detected at the LHC using final states with three same-sign same-flavour leptons.