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Quark vs Gluon Jet Tagging at ATLAS

Distinguishing quark-initiated from gluon-initiated jets is useful for many measurements and searches at the LHC. We present a quark-initiated versus gluon-initiated jet tagger from the ATLAS experiment using the number of reconstructed charged particles inside the jet. The measurement of the charge...

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Autor principal: Rubbo, Francesco
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:http://cds.cern.ch/record/2275502
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author Rubbo, Francesco
author_facet Rubbo, Francesco
author_sort Rubbo, Francesco
collection CERN
description Distinguishing quark-initiated from gluon-initiated jets is useful for many measurements and searches at the LHC. We present a quark-initiated versus gluon-initiated jet tagger from the ATLAS experiment using the number of reconstructed charged particles inside the jet. The measurement of the charged-particle multiplicity inside jets from Run 1 is used to derive uncertainties on the tagger performance for Run 2. With an efficiency of 60% to select quark-initiated jets, the efficiency to select gluon-initiated jets is between 10 and 20% across a wide range in jet pT up to 1.5 TeV with about an absolute 5% systematic uncertainty on the efficiencies. In addition, we also present preliminary studies on a tagger for the ATLAS experiment using the full radiation pattern inside a jet processed as images in deep neural network classifiers.
id cern-2275502
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
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spelling cern-22755022019-09-30T06:29:59Zhttp://cds.cern.ch/record/2275502engRubbo, FrancescoQuark vs Gluon Jet Tagging at ATLASParticle Physics - ExperimentDistinguishing quark-initiated from gluon-initiated jets is useful for many measurements and searches at the LHC. We present a quark-initiated versus gluon-initiated jet tagger from the ATLAS experiment using the number of reconstructed charged particles inside the jet. The measurement of the charged-particle multiplicity inside jets from Run 1 is used to derive uncertainties on the tagger performance for Run 2. With an efficiency of 60% to select quark-initiated jets, the efficiency to select gluon-initiated jets is between 10 and 20% across a wide range in jet pT up to 1.5 TeV with about an absolute 5% systematic uncertainty on the efficiencies. In addition, we also present preliminary studies on a tagger for the ATLAS experiment using the full radiation pattern inside a jet processed as images in deep neural network classifiers.ATL-PHYS-SLIDE-2017-574oai:cds.cern.ch:22755022017-07-23
spellingShingle Particle Physics - Experiment
Rubbo, Francesco
Quark vs Gluon Jet Tagging at ATLAS
title Quark vs Gluon Jet Tagging at ATLAS
title_full Quark vs Gluon Jet Tagging at ATLAS
title_fullStr Quark vs Gluon Jet Tagging at ATLAS
title_full_unstemmed Quark vs Gluon Jet Tagging at ATLAS
title_short Quark vs Gluon Jet Tagging at ATLAS
title_sort quark vs gluon jet tagging at atlas
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2275502
work_keys_str_mv AT rubbofrancesco quarkvsgluonjettaggingatatlas