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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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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:09 Jan 2017 09:52
Last Modified:07 Sep 2017 13:51
Publisher:Springer
ISSN:1029-8479
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP01(2016)096

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