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Title: Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at s = 13  TeV

Journal Article · · Physics Letters. B
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Results are presented of a search for a heavy Majorana neutrino N$$\ell$$ decaying into two same-flavor leptons ℓ (electrons or muons) and a quark-pair jet. A model is considered in which the N$$\ell$$ is an excited neutrino in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at s = 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb - 1 . The data are found to be in agreement with the standard model prediction. For the process in which the N$$\ell$$ is produced in association with a lepton, followed by the decay of the N$$\ell$$ to a same-flavor lepton and a quark pair, an upper limit at 95% confidence level on the product of the cross section and branching fraction is obtained as a function of the N$$\ell$$ mass $$m$$N$$_{\ell}$$ and the compositeness scale Λ. For this model the data exclude the existence of N$$_e$$ (Nμ) for $$m$$N$$_{\ell}$$ below 6.0 (6.1) TeV, at the limit where $$m$$N$$_{\ell}$$ is equal to Λ. For $$m$$N$$_{\ell}$$ ≈ 1 Tev, values of Λ less than 20 (23) TeV are excluded. These results represent a considerable improvement in sensitivity, covering a larger parameter space than previous searches in pp collisions at 13 TeV.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
The CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
2217161
Report Number(s):
CMS-EXO-20-011; CERN-EP-2022-181; FERMILAB-PUB-23-710-CMS; arXiv:2210.03082; oai:inspirehep.net:2671384
Journal Information:
Physics Letters. B, Vol. 843; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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