Measurement of the integrated and differential t[bar over t] production cross sections for high- pT top quarks in pp collisions at √s = 8 TeV
The cross section for pair production of top quarks (t[bar over t]) with high transverse momenta is measured in p collisions, collected with the CMS detector at the LHC with √s = 8 TeV in data corresponding to an integrated luminosity of 19.7 fb [superscript -1]. The measurement is performed using...
| Summary: | The cross section for pair production of top quarks (t[bar over t]) with high transverse momenta is measured in p collisions, collected with the CMS detector at the LHC with √s = 8 TeV in data corresponding to an integrated luminosity of 19.7 fb [superscript -1]. The measurement is performed using lepton + jets events, where one top quark decays semileptonically, while the second top quark decays to a hadronic final state. The hadronic decay is reconstructed as a single, large-radius jet, and identified as a top quark candidate using jet substructure techniques. The integrated cross section and the differential cross sections as a function of top quark pT and rapidity are measured at particle level within a fiducial region related to the detector-level requirements and at parton level. The particle-level integrated cross section is found to be σ[subscript t[bar over t]] = 0.499
± 0.035 (stat + syst) ± 0.095 (theo) ± 0.013 (lumi) pb
for top quark pT > 400 GeV. The parton-level measurement is σ[subscript t[bar over t]] = 1.44 ± 0.10 (stat + syst) ± 0.29 (theo) ± 0.04 (lumi) pb. The integrated and differential cross section results are compared to predictions from several event generators. |
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