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 = 8TeV in data corresponding to an integrated luminosity of 19.7fb−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.
Measurement of the integrated and differential t̅t production cross sections for high-pt top quarks in pp collisions at √s =8 TeV
AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;KIANI, Muhammad Bilal Manzoor;MIGLIORE, Ernesto;MONACO, Vincenzo;MONTEIL, ENNIO;OBERTINO, Maria Margherita;PACHER, LUCA;PINNA ANGIONI, GIAN LUCA;RAVERA, FABIO;ROMERO, Alessandra;SACCHI, Roberto;SOLA, VALENTINA;SOLANO, Ada Maria;
2016-01-01
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 = 8TeV in data corresponding to an integrated luminosity of 19.7fb−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.File | Dimensione | Formato | |
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PhysRevD.94.072002.pdf
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