Measurement of the inclusive and fiducial tt̅ production cross-sections in the lepton + jets channel in pp collisions at √s = 8 TeV with the ATLAS detector

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Measurement of the inclusive and fiducial tt̅ production cross-sections in the lepton + jets channel in pp collisions at √s = 8 TeV with the ATLAS detector. European physical journal. C - particles and fields, 78(6) EDP Sciences 10.1140/epjc/s10052-018-5904-z

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The inclusive and fiducial tt̅ production crosssections are measured in the lepton + jets channel using 20.2 fb⁻¹ of proton–proton collision data at a centre-of mass energy of 8 TeV recorded with the ATLAS detector at the LHC. Major systematic uncertainties due to the modelling of the jet energy scale and b-tagging efficiency are constrained by separating selected events into three disjoint regions. In order to reduce systematic uncertainties in the most important background, the W+jets process is modelled using Z+jets events in a data-driven approach. The inclusive tt̅ cross-section is measured with a precision of 5.7% to be σinc(tt̅) = 248.3 ± 0.7 (stat.) ± 13.4 (syst.) ± 4.7 (lumi.) pb, assuming a top-quark mass of 172.5 GeV. The result is in agreement with the Standard Model prediction. The crosssection is also measured in a phase space close to that of the selected data. The fiducial cross-section is σfid(tt̅) = 48.8 ± 0.1 (stat.) ± 2.0 (syst.) ± 0.9 (lumi.) pb with a precision of 4.5%.

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