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

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.

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References in corpus (21)

• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Big-Bang Nucleosynthesis
• Pileup subtraction using jet areas
• The Catchment Area of Jets
• MCFM for the Tevatron and the LHC
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• Boosted Decision Trees as an Alternative to Artificial Neural Networks for Particle Identification
• The PDF4LHC Working Group Interim Recommendations
• The PDF4LHC Working Group Interim Report
• Complete Higgs Sector Constraints on Dimension-6 Operators
• t tbar W and t tbar Z Hadroproduction at NLO accuracy in QCD with Parton Shower and Hadronization effects
• Search for the associated production of the Higgs boson with a top-quark pair
• Measurement of the inelastic proton-proton cross section at sqrt(s) = 7 TeV
• Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s) = 8 TeV
• Model Independent Constraints Among the Wtb, Zbb, and Ztt Couplings
• A Study of b bbar Production in e+e- Collisions at sqrt(s) = 130-207 GeV
• Dipole-induced anomalous top quark couplings at the LHC

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