Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV
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; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yoon, A. S.; Zanetti, Marco; Barbieri, Richard Alexander; Bauer, Gerry P; Dutta, Valentina; Lee, Yen-Jie; Levin, Andrew Michael; Luckey Jr, P David; Roland, Christof E; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; Yang, Mingming; Wyslouch, Victoria; ... Show more Show less
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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.
Date issued
2014-09Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
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
ISSN
1434-6044
1434-6052