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


CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; et al; Chiochia, V; Kilminster, B; Robmann, P (2013). Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at s√=7 TeV. Physical Review Letters, 110(17):172002.

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 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=0.28+0.14−0.11 (stat)+0.06−0.03 (syst)  pb is obtained. In the dilepton channel a measurement of the tt¯V cross section yields σtt¯V=0.43+0.17−0.15 (stat)+0.09−0.07 (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+0.012−0.016 and 0.306+0.031−0.053  pb.

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 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=0.28+0.14−0.11 (stat)+0.06−0.03 (syst)  pb is obtained. In the dilepton channel a measurement of the tt¯V cross section yields σtt¯V=0.43+0.17−0.15 (stat)+0.09−0.07 (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+0.012−0.016 and 0.306+0.031−0.053  pb.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:17 Feb 2014 10:22
Last Modified:05 Apr 2016 17:38
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.110.172002

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