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Scientific article
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English

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

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 761, p. 136-157
Collection
  • Open Access - SCOAP3
Publication date2016
Abstract

This paper describes a measurement of the inclusive top quark pair production cross-section ( σtt¯ ) with a data sample of 3.2fb−1 of proton–proton collisions at a centre-of-mass energy of s=13TeV , 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 b -tag 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.

Citation (ISO format)
ATLAS Collaboration. Measurement of the tt¯ production cross-section using eμ events with b -tagged jets in pp collisions at √s = 13 TeV with the ATLAS detector. In: Physics letters. B, 2016, vol. 761, p. 136–157. doi: 10.1016/j.physletb.2016.08.019
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ISSN of the journal0370-2693
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