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

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

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 measurem...

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Bibliographic Details
Main Authors: 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
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2013
Online Access:http://hdl.handle.net/1721.1/81368
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary: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.

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