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Performance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detector

Electrons may be copiously produced in heavy-ion collisions. They constitute important final states from leptonic decay channels of Z and W bosons. Their reconstruction and identification is very challenging in heavy-ion collisions due to large detector occupancy varying strongly with the collision...

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Autor principal: Kremer, Jakub Andrzej
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:http://cds.cern.ch/record/2220091
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author Kremer, Jakub Andrzej
author_facet Kremer, Jakub Andrzej
author_sort Kremer, Jakub Andrzej
collection CERN
description Electrons may be copiously produced in heavy-ion collisions. They constitute important final states from leptonic decay channels of Z and W bosons. Their reconstruction and identification is very challenging in heavy-ion collisions due to large detector occupancy varying strongly with the collision centrality. The presented material will discuss performance of high-pT electrons, including trigger, reconstruction and identification in lead-lead data collected at 5.02 TeV by the ATLAS detector in 2015. Studies will be focused on optimization of the likelihood approach for identifying signal electrons coming mostly from W and Z boson decays. The likelihood method has been applied successfully in proton-proton collisions in the ATLAS experiment, but in order to perform well in lead-lead collisions, centrality dependence has had to be considered. Also during the 2015 heavy-ion run the ATLAS tracker operated with a different gas mixture from the nominal one used for electron identification in proton-proton collisions. Its impact on electron performance also will be discussed.
id cern-2220091
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
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spelling cern-22200912019-09-30T06:29:59Zhttp://cds.cern.ch/record/2220091engKremer, Jakub AndrzejPerformance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detectorParticle Physics - ExperimentElectrons may be copiously produced in heavy-ion collisions. They constitute important final states from leptonic decay channels of Z and W bosons. Their reconstruction and identification is very challenging in heavy-ion collisions due to large detector occupancy varying strongly with the collision centrality. The presented material will discuss performance of high-pT electrons, including trigger, reconstruction and identification in lead-lead data collected at 5.02 TeV by the ATLAS detector in 2015. Studies will be focused on optimization of the likelihood approach for identifying signal electrons coming mostly from W and Z boson decays. The likelihood method has been applied successfully in proton-proton collisions in the ATLAS experiment, but in order to perform well in lead-lead collisions, centrality dependence has had to be considered. Also during the 2015 heavy-ion run the ATLAS tracker operated with a different gas mixture from the nominal one used for electron identification in proton-proton collisions. Its impact on electron performance also will be discussed.ATL-PHYS-SLIDE-2016-718oai:cds.cern.ch:22200912016-09-28
spellingShingle Particle Physics - Experiment
Kremer, Jakub Andrzej
Performance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detector
title Performance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detector
title_full Performance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detector
title_fullStr Performance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detector
title_full_unstemmed Performance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detector
title_short Performance of high-pT electron identification in lead-lead collisions at 5.02 TeV with the ATLAS detector
title_sort performance of high-pt electron identification in lead-lead collisions at 5.02 tev with the atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2220091
work_keys_str_mv AT kremerjakubandrzej performanceofhighptelectronidentificationinleadleadcollisionsat502tevwiththeatlasdetector