Measurement of the integrated and differential t-tbar production cross sections for high-pt top quarks in pp collisions at sqrt(s) = 8 TeV
(2016) Physical Review D — Vol. D94, p. 72002 (2016)
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- 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.
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CMS, Beluffi, C., Bondu, O., Brochet, S., Bruno, G., Caudron, A., Ceard, L., de Visscher, S., Delaere, C., Delcourt, M., Favart, D., Forthomme, L., Giammanco, A., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Mertens, A., Musich, M., et al. (2016). Measurement of the integrated and differential t-tbar production cross sections for high-pt top quarks in pp collisions at sqrt(s) = 8 TeV. Physical Review D, D94, 72002. https://doi.org/10.1103/PhysRevD.94.072002 (Original work published 2016)