Search for Heavy Majorana Neutrinos in Same-Sign Dilepton Channels in Proton-Proton Collisions at √s = 13 TeV
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Sirunyan2019_Article_SearchForHeavyMajoranaNeutrino.pdf
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
January 2019
Journal
Journal of High Energy Physics
Publisher
Springer
Citation
Sirunyan, A. M. et al. “Search for Heavy Majorana Neutrinos in Same-Sign Dilepton Channels in Proton-Proton Collisions at √s = 13 TeV.” Journal of High Energy Physics 2019, 1 (January 2019): 122 © 2019 The Author(s)
Version
Final published version
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 |VeN|², |VμN|², and |VeNV μN * |²/(|VeN|² + |VμN|²), where VℓN 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 |VℓN|2 range between 2.3 × 10⁻⁵ and unity. These are the most restrictive direct limits for heavy Majorana neutrino masses above 430 GeV.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1007/JHEP01(2019)122
