Measurement of the integrated and differential tt¯ production cross sections for high-pT top quarks in pp collisions at s = 8  TeV

Vardan Khachatryan, the CMS Collaboration

Research output: Contribution to journalArticle (Academic Journal)peer-review

27 Citations (Scopus)
235 Downloads (Pure)

Abstract

The cross section for pair production of top quarks (t-tbar) with high transverse momenta is measured in pp collisions, collected with the CMS detector at the LHC with sqrt(s) = 8 TeV in data corresponding to an integrated luminosity of 19.7 inverse femtobarns. 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 sigma[t-tbar] = 0.499 +/- 0.035 (stat+syst) +/- 0.095 (theory) +/- 0.013 (lumi) pb for top quark pt > 400 GeV. The parton-level measurement is sigma[t-tbar] = 1.44 +/- 0.10 (stat+syst) +/- 0.29 (theory) +/- 0.04 (lumi) pb. The integrated and differential cross section results are compared to predictions from several event generators.
Original languageEnglish
Article number072002
Number of pages25
JournalPhysical Review D
Volume94
Issue number7
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • hep-ex

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