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High Energy Physics - Experiment

arXiv:1510.01131 (hep-ex)
[Submitted on 5 Oct 2015 (v1), last revised 8 Feb 2016 (this version, v2)]

Title:Observation of top quark pairs produced in association with a vector boson in pp collisions at sqrt(s) = 8 TeV

Authors:CMS Collaboration
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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 inverse femtobarns, 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 ttW or ttZ decays. The ttW cross section is measured to be 382 +117 -102 fb with a significance of 4.8 standard deviations from the background-only hypothesis. The ttZ cross section is measured to be 242 +65 -55 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 ttW and ttZ cross sections.
Comments: Replaced with published version. Added journal reference and DOI
Subjects: High Energy Physics - Experiment (hep-ex)
Report number: CMS-TOP-14-021, CERN-PH-EP-2015-248
Cite as: arXiv:1510.01131 [hep-ex]
  (or arXiv:1510.01131v2 [hep-ex] for this version)
  https://doi.org/10.48550/arXiv.1510.01131
Journal reference: JHEP 01 (2016) 096
Related DOI: https://doi.org/10.1007/JHEP01%282016%29096

Submission history

From: The CMS Collaboration [view email]
[v1] Mon, 5 Oct 2015 12:47:16 UTC (1,078 KB)
[v2] Mon, 8 Feb 2016 14:35:39 UTC (1,067 KB)
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