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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...
Autores principales: | , , , , , |
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Lenguaje: | eng |
Publicado: |
2012
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Materias: | |
Acceso en línea: | http://cds.cern.ch/record/1457598 |
_version_ | 1780925126920896512 |
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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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