Observation of top quark pairs produced in association with a vector boson in pp collisions at root s=8 TeV
Type :
Article
Publication Status :
published
Access :
restrictedAccess
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 tt¯Wtt¯W or tt¯Ztt¯Z decays. The tt¯Wtt¯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 tt¯Ztt¯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 tt¯Wtt¯W and tt¯Ztt¯Z cross sections.
Source :
Journal of High Energy Physics
Date :
2016-01
Publisher :
Springer Nature
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