# Observation of top quark pairs produced in association with a vector boson in pp collisions at $\sqrt{s}$ = 8 TeV

CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Observation of top quark pairs produced in association with a vector boson in pp collisions at $\sqrt{s}$ = 8 TeV. Journal of High Energy Physics, 1601:96.

## Abstract

Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb$^{−1}$, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from $t\overline{t}W$ or $t\overline{t}Z$ decays. The $t\overline{t}W$ cross section is measured to be 382$_{− 102}$$^{+ 117} fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t\overline{t}Z cross section is measured to be 242_{-55}$$^{+65}$ fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the $t\overline{t}W$ and$t\overline{t}Z$ cross sections.

## Abstract

Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb$^{−1}$, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from $t\overline{t}W$ or $t\overline{t}Z$ decays. The $t\overline{t}W$ cross section is measured to be 382$_{− 102}$$^{+ 117} fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t\overline{t}Z cross section is measured to be 242_{-55}$$^{+65}$ fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the $t\overline{t}W$ and$t\overline{t}Z$ cross sections.

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## Additional indexing

Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2016 09 Jan 2017 09:52 23 Sep 2018 06:04 Springer 1029-8479 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP01(2016)096

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