A search for physics beyond the standard model in the final state with two same-flavour leptons (electrons or muons) and two quarks produced in proton–proton collisions at √s=13 TeVis presented. The data were recorded by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 2.3 fb−1. The observed data are in good agreement with the standard model background prediction. The results of the measurement are interpreted in the framework of a recently proposed model in which a heavy Majorana neutrino, Nlambda, stems from a composite-fermion scenario. Exclusion limits are set for the first time on the mass of the heavy composite Majorana neutrino, mNlambda, and the compositeness scale Lambda. For the case mNlambda=Lambda, the existence of Ne(Nμ) is excluded for masses up to 4.60 (4.70)TeV at 95% confidence level.

(2017). Search for a heavy composite Majorana neutrino in the final state with two leptons and two quarks at √s=13 TeV [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/142455

Search for a heavy composite Majorana neutrino in the final state with two leptons and two quarks at √s=13 TeV

Re, V.;Vai, I.;