Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at sqrt[s]=7 TeV
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Chatrchyan-2013-Measurement of associated production of vector bosons.pdf
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Author(s)
Apyan, Aram
Bendavid, Joshua L.
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Kim, Y.
Date Issued
April 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, et al. 2013 Measurement of Associated Production of Vector Bosons and Top Quark-antiquark Pairs in Pp Collisions at Sqrt[s]=7 TeV. Physical Review Letters 110(17).
Version
Final published version
Abstract
The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at √s=7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb-1, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of tt̅ Z events and a same-sign dilepton analysis of tt̅ V (V=W or Z) events. In the trilepton channel a direct measurement of the tt̅ Z cross section σtt̅ Z=0.28[subscript -0.11][superscript +0.14] (stat)[subscript -0.03][superscript +0.06] (syst) pb is obtained. In the dilepton channel a measurement of the tt̅ V cross section yields σtt̅ V=0.43[subscript -0.15][superscript +0.17] (stat)[subscript -0.07][superscript +0.09] (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137[subscript -0.016][superscript +0.012] and 0.306[subscript -0.053][superscript +0.031] pb.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.172002
