Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV
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The-2014-Measurement of top q.pdf
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Author(s)
Apyan, Aram
Busza, Wit
Cali, Ivan Amos
Chan, M.
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Lai, Yue Shi
Date Issued
September 2014
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer-Verlag
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, et al. “Measurement of Top Quark–antiquark Pair Production in Association with a W or Z Boson in Pp Collisions at √s = 8 TeV.” Eur. Phys. J. C 74, no. 9 (September 2014).
Version
Final published version
Abstract
A measurement of the cross section for the production of top quark–antiquark pairs ( t [bar over t]) in association with a vector boson V (W or Z) in proton-proton collisions at √s=8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb [superscript −1] recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and μ ) channels: a same-sign dilepton analysis targeting t [bar over t]W events, and trilepton and four-lepton analyses designed for t [bar over t]Z events. In the same-sign dilepton channel, the t[bar over t]W cross section is measured as σ[subscript t [bar over t] W] =170[superscript +90][subscript −80](stat)±70(syst)fb , corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the t[bar over t]Z cross section, σ[subscript t [bar over t]Z] = 200[superscript +80][subscript −70](stat)[superscript +40][subscript −30(syst)]fb[superscript −1], is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive t[bar over t]V process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.
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/10.1140/epjc/s10052-014-3060-7
