Abstract
We discuss the possibility of probing physics behind the generation of neutrino mass and its observability at the LHC. We focus on TeV scale tree-level see-saw mechanisms and their natural origin from the minimal left-right symmetric model or grand unified theories, such as the minimal SU(5). The fundamental aspect related to the Majorana nature of neutrinos is the breaking of lepton number, which can manifest itself at high energies via same-sign leptons and jets. Final states differ for different see-saw mediators and data from the LHC provide significantly improved or novel bounds on all three tree-level realisations. Simultaneously, searches for lepton number (and flavour) violation at low energies provide complementary information to colliders.
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