Measurement of the t(t)over-bar production cross-section using eμ events with b-tagged jets in <i>pp</i> collisions at √s= 13TeV with the ATLAS detector (vol 761, pg 136, 2016)



Aaboud, M, Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2845 more authors) (2017) Measurement of the t(t)over-bar production cross-section using eμ events with b-tagged jets in <i>pp</i> collisions at √s= 13TeV with the ATLAS detector (vol 761, pg 136, 2016). PHYSICS LETTERS B, 772. p. 879.

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Abstract

This paper describes a measurement of the inclusive top quark pair production cross-section ($\sigma_{t\bar{t}}$) with a data sample of 3.2 fb$^{-1}$ of proton--proton collisions at a centre-of-mass energy of $\sqrt{s}$=13 TeV, 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 $\sigma_{t\bar{t}}$ 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: $\sigma_{t\bar{t}}$= 818 $\pm$ 8 (stat) $\pm$ 27 (syst) $\pm$ 19 (lumi) $\pm$ 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.

Item Type: Article
Additional Information: 20 pages plus author list (37 pages total), 4 figures, 4 tables, published version including erratum corrections, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-09/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 04 Nov 2016 11:19
Last Modified: 11 Oct 2023 20:39
DOI: 10.1016/j.physletb.2017.09.027
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3003898