Measurement of the inclusive and fiducial <i>t</i>(<i>t</i>)over-bar production cross-sections in the lepton plus jets channel in <i>pp</i> collisions at √s=8 TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2878 more authors) (2018) Measurement of the inclusive and fiducial <i>t</i>(<i>t</i>)over-bar production cross-sections in the lepton plus jets channel in <i>pp</i> collisions at √s=8 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 78 (6). 487-.

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Abstract

The inclusive and fiducial t t ¯ production cross-sections 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 <i>b</i>-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 t t ¯ cross-section is measured with a precision of 5.7% to be σ inc ( t t ¯ ) = 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 cross-section is also measured in a phase space close to that of the selected data. The fiducial cross-section is σ fid ( t t ¯ ) = 48.8 ± 0.1 ( stat . ) ± 2.0 ( syst . ) ± 0.9 ( lumi . ) pb with a precision of 4.5%.

Item Type: Article
Additional Information: 50 pages in total, author list starting page 33, 7 figures, 4 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2016-08/
Uncontrolled Keywords: ATLAS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 20 Aug 2018 08:24
Last Modified: 09 Feb 2024 08:38
DOI: 10.1140/epjc/s10052-018-5904-z
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3025280