2018
DOI: 10.1140/epjc/s10052-018-5904-z
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Measurement of the inclusive and fiducial $$t\bar{t}$$ t t ¯ production cross-sections in th

Abstract: The inclusive and fiducial tt production crosssections are measured in the lepton+jets channel using 20.2 fb −1 of proton-proton collision data at a centre-ofmass 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 usin… Show more

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Cited by 9 publications
(4 citation statements)
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“…Compared to the fully-hadronic mode, the -plus-jets channel has a slightly smaller B ≈ 35% overall branching ratio, and half the number of top quarks available for the 2-body decay, but it features a cleaner experimental signature based on the presence of a high-p T isolated electron or muon. The following selection criteria, typically used by the ATLAS/CMS experiments [46][47][48][49][50][51], are applied:…”
Section: Lepton+jets Tt Final Statementioning
confidence: 99%
“…Compared to the fully-hadronic mode, the -plus-jets channel has a slightly smaller B ≈ 35% overall branching ratio, and half the number of top quarks available for the 2-body decay, but it features a cleaner experimental signature based on the presence of a high-p T isolated electron or muon. The following selection criteria, typically used by the ATLAS/CMS experiments [46][47][48][49][50][51], are applied:…”
Section: Lepton+jets Tt Final Statementioning
confidence: 99%
“…There will be small systematic uncertainties in the f iα measured thus, from background contributions to the overall sample normalisation, D 0 , which we have not discussed in any detail. However, these backgrounds themselves are at a level of not more than a few percent, based on the small contributions of non tt backgrounds in the tt cross-section analyses [7], and their uncertainties will be significantly smaller still, rendering them negligible in the present context.…”
Section: Mis-tag Background Control Samplesmentioning
confidence: 91%
“…(2.1), and include the lepton tagging efficiency, but exclude the jet flavour-tagging. Published ATLAS and CMS tt measurements obtained top-pair pre-selection efficiencies in the region of 17% for ATLAS at 8 TeV [7], and 13% for CMS at 13 TeV [4] (the selection cuts were different in the two cases; neither includes any branching fractions). For the purposes of estimating the sample sizes for this measurement, we set it conservatively to 0 = 10% here.…”
Section: Symbolmentioning
confidence: 99%
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