Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at s = 13 TeV
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 recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 . 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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