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Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jets

This note describes a measurement of the inclusive top-pair production cross-section ($\sigma_{t\bar{t}}$) with a data sample of 78 pb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV, collected in 2015 by the ATLAS detector, using $t\bar{t}$ events with an opposite...

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Autor principal: The ATLAS collaboration
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:http://cds.cern.ch/record/2038144
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author The ATLAS collaboration
author_facet The ATLAS collaboration
author_sort The ATLAS collaboration
collection CERN
description This note describes a measurement of the inclusive top-pair production cross-section ($\sigma_{t\bar{t}}$) with a data sample of 78 pb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV, collected in 2015 by the ATLAS detector, using $t\bar{t}$ events with an opposite-sign 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 were counted and used to determine simultaneously $\sigma_{t\bar{t}}$ 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: \[ \sigma_{t\bar{t}}= 825 \pm 49 \ (stat) \pm 60 (syst) \pm 83 (lumi)~pb, \] where the three uncertainties arise from data statistics, experimental and theoretical systematic effects, and the integrated luminosity, giving a total relative uncertainty of 14%. The result is consistent with recent theoretical QCD calculations at next-to-next-to-leading order.
id cern-2038144
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
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spelling cern-20381442021-04-18T19:38:38Zhttp://cds.cern.ch/record/2038144engThe ATLAS collaborationMeasurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jetsParticle Physics - ExperimentThis note describes a measurement of the inclusive top-pair production cross-section ($\sigma_{t\bar{t}}$) with a data sample of 78 pb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV, collected in 2015 by the ATLAS detector, using $t\bar{t}$ events with an opposite-sign 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 were counted and used to determine simultaneously $\sigma_{t\bar{t}}$ 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: \[ \sigma_{t\bar{t}}= 825 \pm 49 \ (stat) \pm 60 (syst) \pm 83 (lumi)~pb, \] where the three uncertainties arise from data statistics, experimental and theoretical systematic effects, and the integrated luminosity, giving a total relative uncertainty of 14%. The result is consistent with recent theoretical QCD calculations at next-to-next-to-leading order.ATLAS-CONF-2015-033oai:cds.cern.ch:20381442015-07-27
spellingShingle Particle Physics - Experiment
The ATLAS collaboration
Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jets
title Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jets
title_full Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jets
title_fullStr Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jets
title_full_unstemmed Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jets
title_short Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV using $e\mu$ events with $b$-tagged jets
title_sort measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ tev using $e\mu$ events with $b$-tagged jets
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2038144
work_keys_str_mv AT theatlascollaboration measurementofthetbartproductioncrosssectioninppcollisionsatsqrts13tevusingemueventswithbtaggedjets