• Open Access

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

S. Chatrchyan et al. (CMS Collaboration)
Phys. Rev. Lett. 110, 172002 – Published 25 April 2013
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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=7TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0fb1, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of tt¯Z events and a same-sign dilepton analysis of tt¯V (V=W or Z) events. In the trilepton channel a direct measurement of the tt¯Z cross section σtt¯Z=0.280.11+0.14(stat)0.03+0.06(syst)pb is obtained. In the dilepton channel a measurement of the tt¯V cross section yields σtt¯V=0.430.15+0.17(stat)0.07+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 0.1370.016+0.012 and 0.3060.053+0.031pb.

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  • Received 13 March 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.172002

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2013 CERN, for the CMS Collaboration

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Vol. 110, Iss. 17 — 26 April 2013

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