Search for heavy majorana neutrinos in μ[superscript ±]μ[superscript ±] + jets events in proton–proton collisions at √s = 8 TeV
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Khachatryan-2015-Search for heavy Maj.pdf
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Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Bierwagen, Katharina
Busza, Wit
Cali, Ivan Amos
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Date Issued
July 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
Khachatryan, V., et al. “Search for Heavy Majorana Neutrinos in μ[superscript ±]μ[superscript ±] + Jets Events in Proton–proton Collisions at √s = 8 TeV.” Physics Letters B 748 (September 2015): 144–166. © 2015 CERN for the benefit of the CMS Collaboration
Version
Final published version
Abstract
A search is performed for heavy Majorana neutrinos (N) using an event signature defined by two muons of the same charge and two jets (μ[superscript ±]μ[superscript ±]jj). The data correspond to an integrated luminosity of 19.7 fb[superscript −1] of proton–proton collisions at a center-of-mass energy of 8 TeV, collected with the CMS detector at the CERN LHC. No excess of events is observed beyond the expected standard model background and upper limits are set on |V[subscript μN]|[superscript 2] as a function of Majorana neutrino mass m[subscript N] for masses in the range of 40–500 GeV, where V[subscript μN] is the mixing element of the heavy neutrino with the standard model muon neutrino. The limits obtained are |V[subscript μN]|[superscript 2]<0.00470 for m[subscript N]=90 GeV, |V[subscript μN]|[superscript 2]<0.0123 for m[subscript N]=200 GeV, and |V[subscript μN]|[superscript 2]<0.583 for m[subscript N]=500 GeV. These results extend considerably the regions excluded by previous direct searches.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.06.070
