Search for Heavy Neutrinos in di-lepton and di-jet events

The di-lepton and di-jet final state is sensitive to many theoretical modelsbeyond the Standard Model, including scalar and vector leptoquarks of thethree generations and heavy Majorana neutrinos, arising from the seesawmechanism, also in the context of a LR-symmetry extension or in a compo-siteness scenario.The most recent CMS results have shown a signicant excess in the di-electron and di-jet channel, in two indipendent analysis one is a search forheavy neutrinos, deriving from the LR-symmetry extension and the otherlooks for a pair-production of first generation scalar leptoquarks, both per-formed at 8 TeV. No excess has been observed in the di-muon and di-jetchannel; while the di-tau and di-jet signature has not yet been explored forthe heavy neutrinos specific search, but only for the leptoquarks, with a b ort jet tagging.A benchmark process with a same flavour di-lepton plus di-jet signature, inthe frame of composite neutrinos and contact interactions, is taken into con-sideration to clarify the nature of the excess and to extend the mass limit forthe heavy neutrinos, exploiting the run 2 of CMS.