Search for heavy Majorana neutrinos in e±e±+ jets and e± μ ±+ jets events in proton-proton collisions at s = 8 √s=8 TeV
Name
Khachatryan2016_Article_SearchForHeavyMajoranaNeutrino.pdf
Description
Published version
Size
722.26 KB
Format
Adobe PDF
Checksum (MD5)
d2ca60673609a164d1622f428262effe
Author(s)
The CMS Collaboration
Date Issued
2016
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Version
Final published version
Abstract
© CERN, for the benefit of the CMS Collaboration. A search is performed for heavy Majorana neutrinos (N) decaying into a W boson and a lepton using the CMS detector at the Large Hadron Collider. A signature of two jets and either two same sign electrons or a same sign electron-muon pair is searched for using 19.7 fb-1 of data collected during 2012 in proton-proton collisions at a centre-of-mass energy of 8TeV. The data are found to be consistent with the expected standard model (SM) background and, in the context of a Type-1 seesaw mechanism, upper limits are set on the cross section times branching fraction for production of heavy Majorana neutrinos in the mass range between 40 and 500 GeV. The results are additionally interpreted as limits on the mixing between the heavy Majorana neutrinos and the SM neutrinos. In the mass range considered, the upper limits range between 0.00015-0.72 for |VeN|2 and 6.6×10-5-0.47 for |VeNV * µN|2/(|VeN|2+|VµN|2), where V ℓN is the mixing element describing the mixing of the heavy neutrino with the SM neutrino of flavour ℓ. These limits are the most restrictive direct limits for heavy Majorana neutrino masses above 200 GeV.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP04(2016)169
