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Search for a heavy composite Majorana neutrino in the final state with two leptons and two quarks at s=13TeV
Journal article   Open access   Peer reviewed

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

A. M Sirunyan, Hugues Brun, Cécile Caillol, Gilles Lentdecker, Giuseppe Fasanella, Laurent Favart, Anastasia Grebenyuk, Georgia Karapostoli, Thomas Lenzi, Jelena Luetic, …
Physics letters. B, Vol.775, pp.315-337
12/01/2017
DOI: 10.1016/j.physletb.2017.11.001
url
https://doi.org/10.1016/j.physletb.2017.11.001View
Published (Version of record) Open Access

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.
High Energy Physics Experiment Phenomenology Physique des particules élémentaires

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