Measurement of the tt¯ production cross-section using e𝝁 events with b-tagged jets in pp collisions at √s=13TeV with the ATLAS detector

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Measurement of the tt¯ production cross-section using e𝝁 events with b-tagged jets in pp collisions at √s=13TeV with the ATLAS detector

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Title: Measurement of the tt¯ production cross-section using e𝝁 events with b-tagged jets in pp collisions at √s=13TeV with the ATLAS detector
Author: Franklin, Melissa; Huth, John; Morii, Masahiro

Note: Order does not necessarily reflect citation order of authors.

Citation: ATLAS Collaboration. 2016. Measurement of the tt¯ production cross-section using e𝝁 events with b-tagged jets in pp collisions at √s=13TeV with the ATLAS detector. Phys. Lett. B 761, no. 136. doi:10.1016/j.physletb.2016.08.019
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Abstract: This paper describes a measurement of the inclusive top quark pair production cross-section (σtt¯) 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 σtt¯and the efficiency to reconstruct and btag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be: σtt¯= 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.
Published Version: doi:10.1016/j.physletb.2016.08.019
Other Sources: https://arxiv.org/pdf/1606.02699.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:29362112
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