Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mtext> TeV</mtext></math>

Benecke, Anna;Bruno, Giacomo;Bury, Florian;Caputo, Claudio;Bethani, Agni;et.al.
(2023) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 843 (2023)

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Authors
  • Benecke, AnnaUCLouvain
    author
  • Bruno, GiacomoUCLouvain
    author
  • Bury, FlorianUCLouvain
    author
  • Caputo, ClaudioUCLouvain
    author
  • David, PieterUCLouvain
    author
  • Delaere, Christopheorcid-logoUCLouvain
    author
  • Donertas, Izzeddin SuatUCLouvain
    author
  • Giammanco, AndreaUCLouvain
    author
  • Jaffel, KhawlaUCLouvain
    author
  • Jain, SandhyaUCLouvain
    author
  • Lemaitre, VincentUCLouvain
    author
  • Mondal, KuntalUCLouvain
    author
  • Taliercio, AngelaUCLouvain
    author
  • Tran, Tu ThongUCLouvain
    author
  • Vischia, PietroUCLouvain
    author
  • Wertz, SébastienUCLouvain
    author
  • Bethani, Agniorcid-logoUCLouvain
    author
  • et. al.
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Abstract
Results are presented of a search for a heavy Majorana neutrino Image 1 decaying into two same-flavor leptons ℓ (electrons or muons) and a quark-pair jet. A model is considered in which the Image 1 is an excited neutrino in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at <math altimg="si2.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math> marc:recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138<math altimg="si3.svg"><mspace width="0.2em"/><msup><mrow><mtext>fb</mtext></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1</mn></mrow></msup></math>. The data are found to be in agreement with the standard model prediction. For the process in which the Image 1 is produced in association with a lepton, followed by the decay of the Image 1 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 Image 1 mass Image 2 and the compositeness scale Λ. For this model the data exclude the existence of Image 3 (Image 4) for Image 2 below 6.0 (6.1) TeV, at the limit where Image 2 is equal to Λ. For Image 5, 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 Image 6 collisions at 13 TeV.
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Benecke, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Lemaitre, V., Mondal, K., Taliercio, A., Tran, T. T., Vischia, P., Wertz, S., CMS, Bethani, A., & et al. (2023). Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at <math altimg=“si1.svg”><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak=“goodbreak” linebreakstyle=“after”>=</mo><mn>13</mn><mtext> TeV</mtext></math>. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 843. https://doi.org/10.1016/j.physletb.2023.137803 (Original work published 2023)