Measurement of the ttproduction cross-section using eμ events with b-tagged jets in ppcollisions at √s=13 TeV with the ATLAS detector

Research output: Contribution to journalArticle

Bibtex

@article{0c5ea542734a4649b64643d147834381,
title = "Measurement of the ttproduction cross-section using eμ events with b-tagged jets in ppcollisions at √s=13 TeV with the ATLAS detector",
abstract = "This paper describes a measurement of the inclusive top quark pair production cross-section (σtt̄) with a data sample of 3.2 fb−1of 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 σtt̄and 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: σtt̄ = 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. {\circledC} 2016 The Author(s).",
author = "M Aaboud and G Aad and B. Abbott and J Abdallah and O Abdinov and B Abeloos and Torsten {\AA}kesson and Simona Bocchetta and LENE BRYNGEMARK and Caterina Doglioni and Anders Floderus and Vincent Hedberg and G{\"o}ran Jarlskog and Else Lytken and Ulf Mj{\"o}rnmark and Oxana Smirnova and Oleksandr Viazlo and {ATLAS Collaboration}",
note = "Cited By :13 Export Date: 21 July 2017",
year = "2016",
doi = "10.1016/j.physletb.2016.08.019",
language = "English",
volume = "761",
pages = "136--157",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier",

}