Abstract
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=13TeV is presented. The data were recorded by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 2.3fb−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, Nℓ, stems from a composite-fermion scenario. Exclusion limits are set for the first time on the mass of the heavy composite Majorana neutrino, mNℓ, and the compositeness scale Λ. For the case mNℓ=Λ, the existence of Ne (Nμ) is excluded for masses up to 4.60 (4.70) TeV at 95% confidence level.
Highlights
Experimental evidence has promoted the standard model (SM) to the role of the reference theory for high-energy particle physics
The light red textured curves give the theoretical predictions for three values ranging from 6 to 12 TeV in steps of 3 TeV. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
A search for physics beyond the standard model has been performed in the framework of a new model [12] predicting a heavy Majorana neutrino, N, that originates from a composite-fermion scenario and is produced in association with a matched-flavour charged lepton
Summary
Experimental evidence has promoted the standard model (SM) to the role of the reference theory for high-energy particle physics. We overcome this constraint by selecting events with at least one jet with angular radius large enough to contain a merged pair of partons Such a requirement is highly efficient for heavy composite Majorana neutrino decays mediated by the contact interaction, where we select only one of the two decay jets, as described later in this paper. This final selection, considered for the first time in a search for heavy neutrinos, could improve the sensitivity of searches for heavy neutrinos in the framework of other models, such as the one considered in Refs. This final selection, considered for the first time in a search for heavy neutrinos, could improve the sensitivity of searches for heavy neutrinos in the framework of other models, such as the one considered in Refs. [19,20]
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