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

• Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English
• Published: Elsevier 2018
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/63055/1/63055_Search%20for%20a%20heavy%20composite%20Majorana%20neutrino_article.pdf; http://irep.iium.edu.my/63055/2/63055_Search%20for%20a%20heavy%20composite%20Majorana%20neutrino_scopus.pdf; http://irep.iium.edu.my/63055/; https://reader.elsevier.com/reader/sd/pii/S0370269317308936?token=FE1B66131D017D8783E13DAB0384EEE34B477187E009D38DF10B5435D0F955

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 TeV is 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, N, stems from a composite-fermion scenario. Exclusion limits are set for the first time on the mass of the heavy composite Majorana neutrino, mN , and the compositeness scale �. For the case mN = �, the existence of Ne (Nμ) is excluded for masses up to 4.60 (4.70) TeV at 95% confidence level.