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Measuring the b-jet tagging efficiency using top anti-top events with ATLAS data

Many physics analyses with the ATLAS detector expect to have jets originating from b-quarks in the final state. Algorithms that allow to identify such jets are thus of great importance and it is crucial to understand their performance with data-driven measurements of efficiencies and fake rates. Sin...

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Detalles Bibliográficos
Autores principales: Leyko, A, Duda, D, Mchedlidze, G, Heinric, L, zur Nedden, M, Calkins, R
Lenguaje:eng
Publicado: 2012
Materias:
Acceso en línea:http://cds.cern.ch/record/1457598
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author Leyko, A
Duda, D
Mchedlidze, G
Heinric, L
zur Nedden, M
Calkins, R
author_facet Leyko, A
Duda, D
Mchedlidze, G
Heinric, L
zur Nedden, M
Calkins, R
author_sort Leyko, A
collection CERN
description Many physics analyses with the ATLAS detector expect to have jets originating from b-quarks in the final state. Algorithms that allow to identify such jets are thus of great importance and it is crucial to understand their performance with data-driven measurements of efficiencies and fake rates. Since the top quark almost exclusively decays to a W boson and a b-quark, a sample of top anti-top events is ideal for studying the b-tagging performance. Final states containing one or two leptons have been used to measure the b-tagging efficiency, either by counting the number of b-tagged jets or by applying kinematical fit methods to extract a pure sample of b-jets. The calibration methods based on top anti-top events are especially important because they can provide measurements of the b-tagging efficiency also for jets with high momentum.
id cern-1457598
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
record_format invenio
spelling cern-14575982019-09-30T06:29:59Zhttp://cds.cern.ch/record/1457598engLeyko, ADuda, DMchedlidze, GHeinric, Lzur Nedden, MCalkins, RMeasuring the b-jet tagging efficiency using top anti-top events with ATLAS dataDetectors and Experimental TechniquesMany physics analyses with the ATLAS detector expect to have jets originating from b-quarks in the final state. Algorithms that allow to identify such jets are thus of great importance and it is crucial to understand their performance with data-driven measurements of efficiencies and fake rates. Since the top quark almost exclusively decays to a W boson and a b-quark, a sample of top anti-top events is ideal for studying the b-tagging performance. Final states containing one or two leptons have been used to measure the b-tagging efficiency, either by counting the number of b-tagged jets or by applying kinematical fit methods to extract a pure sample of b-jets. The calibration methods based on top anti-top events are especially important because they can provide measurements of the b-tagging efficiency also for jets with high momentum.ATL-PHYS-SLIDE-2012-407oai:cds.cern.ch:14575982012-06-25
spellingShingle Detectors and Experimental Techniques
Leyko, A
Duda, D
Mchedlidze, G
Heinric, L
zur Nedden, M
Calkins, R
Measuring the b-jet tagging efficiency using top anti-top events with ATLAS data
title Measuring the b-jet tagging efficiency using top anti-top events with ATLAS data
title_full Measuring the b-jet tagging efficiency using top anti-top events with ATLAS data
title_fullStr Measuring the b-jet tagging efficiency using top anti-top events with ATLAS data
title_full_unstemmed Measuring the b-jet tagging efficiency using top anti-top events with ATLAS data
title_short Measuring the b-jet tagging efficiency using top anti-top events with ATLAS data
title_sort measuring the b-jet tagging efficiency using top anti-top events with atlas data
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1457598
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AT dudad measuringthebjettaggingefficiencyusingtopantitopeventswithatlasdata
AT mchedlidzeg measuringthebjettaggingefficiencyusingtopantitopeventswithatlasdata
AT heinricl measuringthebjettaggingefficiencyusingtopantitopeventswithatlasdata
AT zurneddenm measuringthebjettaggingefficiencyusingtopantitopeventswithatlasdata
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