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

Aaboud, M. and Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2016) Measurement of the t t bar production cross-section using eμ events with b-tagged jets in pp collisions at √{ s} = 13TeV with the ATLAS detector. PHYSICS LETTERS B, 761. pp. 136-157. ISSN 0370-2693

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Abstract

This paper describes a measurement of the inclusive top quark pair production cross-section (σ_ttbar) 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 σ_ttbar 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:

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