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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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Lenguaje: | eng |
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2015
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Acceso en línea: | http://cds.cern.ch/record/2038144 |
_version_ | 1780947697977524224 |
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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 |
record_format | invenio |
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 |