• DOI:10.1007/JHEP01(2019)122
• Corpus ID: 119242900

Search for heavy Majorana neutrinos in same-sign dilepton channels in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

@article{Collaboration2018SearchFH,
  title={Search for heavy Majorana neutrinos in same-sign dilepton channels in proton-proton collisions at \$\$ \sqrt\{s\}=13 \$\$ TeV},
  author={Cms Tracker Collaboration},
  journal={Journal of High Energy Physics},
  year={2018}
}

• C. Collaboration
• Published 28 June 2018
• Physics
• Journal of High Energy Physics

Abstract

A search is performed for a heavy Majorana neutrino (N), produced in leptonic decay of a W boson propagator and decaying into a W boson and a lepton, with the CMS detector at the LHC. The signature used in this search consists of two same-sign leptons, in any flavor combination of electrons and muons, and at least one jet. The data were collected during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The results are found to be consistent with the expected standard model background. Upper limits are set in the mass range between 20 and 1600 GeV in the context of a Type-I seesaw mechanism, on |V
eN|2, |V

μN|2, and |V
eN
V

μN

*
|2/(|V
eN|2 + |V

μN|2), where V
ℓN is the matrix element describing the mixing of N with the standard model neutrino of flavor ℓ = e, μ. For N masses between 20 and 1600 GeV, the upper limits on |V
ℓN|2 range between 2.3 × 10−5 and unity. These are the most restrictive direct limits for heavy Majorana neutrino masses above 430 GeV.