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Adye, T.; Alimonti, G.; Aloisio, A.; Annovi, A.; Artamonov, A.; Bai, Y.; Banerjee, Sw; Barreiro, F.; Berger, N.; Blumenschein, U.; Brau, J.E.; Bryngemark, L.; Bugge, M.K.; Calvet, D.; Cardarelli, R.; Casper, D.W.; Chelkov, G.A.; Chen, H.; Cheremushkina, E.; Coadou, Y.; Colijn, A.P.; Dang, N.P.; Demichev, M.; Denisov, S.P.; Doria, A.; Farrington, S.M.; Fusayasu, T.; Gaycken, G.; Gibson, S.M.; Golling, T.; Gongadze, A.; Grafström, P.; Grillo, A.A.; Guescini, F.; Haber, C.; Hadavand, H.K.; Hageböck, S.; Ikeno, M.; Jakobsen, S.; Jones, R.W.L.; Kawagoe, K.; Kim, H.Y.; Klein, M.H.; Kluth, S.; Köneke, K.; Kopp, A.K.; Kroseberg, J.; Kuehn, S.; Kuger, F.; La Rosa Navarro, J.L.; Levchenko, M.; Lopez Paz, I.; Lu, H.; Lubatti, H.J.; Luci, C.; Madaffari, D.; Maleev, V.P.; Mansoulie, B.; Martin-Haugh, S.; Martoiu, V.S.; Mellado Garcia, B.R.; Minami, Y.; Muenstermann, D.; Nielsen, J.; Nisius, R.; Nurse, E.; Ohman, H.; Oleiro Seabra, L.F.; Papadopoulou, Th.D.; Pearson, B.; Qian, J.; Qin, Y.; Rieck, P.; Rizatdinova, F.; Rizvi, E.; Ruan, X.; Sasaki, Y.; Saxon, J.; Schiavi, C.; Schmitt, C.; Schuh, N.; Schwindling, J.; Shcherbakova, A.; Shojaii, S.; Slater, M.; Slawinska, M.; Spangenberg, M.; St. Denis, R.D.; Ströhmer, R.; Tsui, K.M.; Vandelli, W.; Villaplana Perez, M.; Walkowiak, W.; Wang, T.; Wickens, F.J.; Wiik-Fuchs, L.A.M.; Wilk, F.; Worm, S.D.; Zimine, N.I.; Zinser, M.
Physics letters. B, 10/2016, Letnik: 761, Številka: CJournal Article
This paper describes a measurement of the inclusive top quark pair production cross-section (σtt¯) with a data sample of 3.2fb−1 of proton–proton collisions at a centre-of-mass energy of s=13TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron–muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously σtt¯ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be:σtt¯=818±8(stat)±27(syst)±19(lumi)±12(beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented.
