Numerous well-motivated extensions of the Standard Model, notably models linked to the generation of neutrino masses and to searches for neutrinoless double-beta decay, predict the existence of lepton-number-violating (LNV) processes. In particular, the type II seesaw and the left-right symmetric model predict final states consisting of same-sign di-leptons with jets and/or the existence of long-lived heavy neutral leptons which could be detected at the LHC.
In this talk I will review current collider limits on such scenarios and estimate the corresponding future HL-LHC sensitivities for these models. I will show that these models predict observable signals across broad regions of parameter space, whereas the LHC can indirectly probe New Physics scales as high as 70-80 TeV.
https://indico.ijs.si/event/2903/