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

Abstract

The cross section for pair production of top quarks (t ¯ t) with high transverse momenta is measured in pp collisions, collected with the CMS detector at the LHC with √s=8  TeV in data corresponding to an integrated luminosity of 19.7  fb−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 σt ¯ 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 σt ¯ 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

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ORCID for Alexander Belyaev: orcid.org/0000-0002-1733-4408

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