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Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at sqrt[s]=7  TeV

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.; Klute, Markus; Krajczar, Krisztian F.; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Rudolph, Matthew Scott; Stephans, George S. F.; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wolf, Roger; Wyslouch, Boleslaw; Yang, Mingming; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Bauer, Gerry P; Wyslouch, Victoria; Levin, Andrew Michael; Luckey Jr, P David; Ma, Teng; Roland, Christof E; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; ... Show more Show less
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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.
Date issued
2013-04
URI
http://hdl.handle.net/1721.1/81368
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
0031-9007
1079-7114

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