Type-III see-saw at LHC

TL;DR

This paper explores how TeV-scale fermion triplets, predicted by Type-III see-saw models, could be detected at the LHC through distinctive multi-lepton and jet signatures, with strategies to suppress backgrounds and infer neutrino parameters.

Contribution

It introduces specific detection strategies for Type-III see-saw fermion triplets at the LHC, including cuts to reduce backgrounds and methods to measure decay displacements for neutrino parameter inference.

Findings

Identification of LHC signatures for fermion triplets

Development of cuts to suppress Standard Model backgrounds

Potential to measure neutrino parameters via decay displacements

Abstract

Neutrino masses can be generated by fermion triplets with TeV-scale mass, that would manifest at LHC as production of two leptons together with two heavy SM vectors or higgs, giving rise to final states such as 2 leptons + 4 jets (that can violate lepton number and/or lepton flavor) or 1 lepton +4 jets +missing transverse energy. We devise cuts to suppress the SM backgrounds to these signatures. Furthermore, for most of the mass range suggested by neutrino data, triplet decays are detectably displaced from the production point, allowing to infer the neutrino mass parameters. We compare with LHC signals of type-I and type-II see-saw.