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

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Asilar, E. and Filipovic, Nicolas and Bencze, György and Hajdú, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Molnár, József and Bartók, Márton and Makovec, Alajos and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2016) Measurement of the integrated and differential tt¯ production cross sections for high-pT top quarks in pp collisions at √s=8 TeV. PHYSICAL REVIEW D, 94 (7). ISSN 2470-0010

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Abstract

The cross section for pair production of top quarks (tt) with high transverse mo- menta 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 de- cays 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 sec- tion 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 re- quirements and at parton level. The particle-level integrated cross section is found to be σtt = 0.499 ± 0.035 (stat+syst) ± 0.095 (theo) ± 0.013 (lumi) pb for top quark pT > 400 GeV. The parton-level measurement is σtt = 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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