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Observation of top quark pairs produced in association with a vector boson in pp collisions at s = 8 √s=8 TeV

Author(s)
The CMS Collaboration
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Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/
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Abstract
© 2016, Springer Verlag. All rights reserved. Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb-1, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from tt̄W or tt̄Z decays. The tt̄W cross section is measured to be (Formula Presented) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The tt̄Z cross section is measured to be (Formula Presented) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the tt̄W and tt̄Z cross sections.
Date issued
2016
URI
https://hdl.handle.net/1721.1/134597
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
Khachatryan, V., et al. "Observation of Top Quark Pairs Produced in Association with a Vector Boson in Pp Collisions at Root S=8 Tev." Journal of High Energy Physics 1 (2016).
Version: Final published version

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