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Scientific article
Open access
English

Measurements of b -jet tagging efficiency with the ATLAS detector using t t ¯ events at √s = 13 TeV

ContributorsATLAS Collaboration
Published inJournal of High Energy Physics, vol. 1808, 089
Collection
  • Open Access - SCOAP3
Publication date2018
Abstract

The efficiency to identify jets containing b -hadrons ( b -jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs ( t t ¯ ) selected from the 36.1 fb −1 of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy √s = 13 TeV. Two methods are used to extract the efficiency from t t ¯ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b -tagging information, is used to select events in which two b -jets are present, which reduces the dominant uncertainty in the modelling of the flavour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.

Keywords
  • Hadron-Hadron scattering (experiments)
Citation (ISO format)
ATLAS Collaboration. Measurements of b -jet tagging efficiency with the ATLAS detector using t t ¯ events at √s = 13 TeV. In: Journal of High Energy Physics, 2018, vol. 1808, p. 089. doi: 10.1007/JHEP08(2018)089
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Article (Published version)
Identifiers
ISSN of the journal1029-8479
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Creation09/03/2018 9:00:46 AM
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