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

Aaboud, M (2017) Measurement of the t(t)over-bar production cross-section using eμ events with b-tagged jets in pp collisions at √s= 13TeV with the ATLAS detector (vol 761, pg 136, 2016) PHYSICS LETTERS B, 772. p. 879. ISSN 0370-2693, 1873-2445

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Abstract

This paper describes a measurement of the inclusive top quark pair production cross-section (σ<inf>tt¯</inf>) with a data sample of 3.2 fb⁻¹ of proton–proton collisions at a centre-of-mass energy of 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 σ<inf>tt¯</inf> 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: σ<inf>tt¯</inf> = 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.

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:	24 Jun 2026 13:10
DOI:	10.1016/j.physletb.2017.09.027
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3003898
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