A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector

The distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a te...

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Autor principal: Atlas Collaboration
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14346044_v76_n5_p_AtlasCollaboration
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_14346044_v76_n5_p_AtlasCollaboration2023-10-03T16:15:16Z A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector Atlas Collaboration The distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a technique for further differentiating Z bosons from W bosons. The variables used are jet mass, jet charge, and a b-tagging discriminant. A likelihood tagger is constructed from these variables and tested in the simulation of W ′ → WZ for bosons in the transverse momentum range 200 GeV < pT < 400 GeV in s= 8 TeV pp collisions with the ATLAS detector at the LHC. For Z-boson tagging efficiencies of ϵZ = 90 , 50, and 10 % , one can achieve W + -boson tagging rejection factors (1 / ϵW + ) of 1.7, 8.3 and 1000, respectively. It is not possible to measure these efficiencies in the data due to the lack of a pure sample of high pT , hadronically decaying Z bosons. However, the modelling of the tagger inputs for boosted W bosons is studied in data using a tt¯ -enriched sample of events in 20.3 fb - 1 of data at s= 8 TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance. © 2016, CERN for the benefit of the ATLAS collaboration. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14346044_v76_n5_p_AtlasCollaboration
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a technique for further differentiating Z bosons from W bosons. The variables used are jet mass, jet charge, and a b-tagging discriminant. A likelihood tagger is constructed from these variables and tested in the simulation of W ′ → WZ for bosons in the transverse momentum range 200 GeV < pT < 400 GeV in s= 8 TeV pp collisions with the ATLAS detector at the LHC. For Z-boson tagging efficiencies of ϵZ = 90 , 50, and 10 % , one can achieve W + -boson tagging rejection factors (1 / ϵW + ) of 1.7, 8.3 and 1000, respectively. It is not possible to measure these efficiencies in the data due to the lack of a pure sample of high pT , hadronically decaying Z bosons. However, the modelling of the tagger inputs for boosted W bosons is studied in data using a tt¯ -enriched sample of events in 20.3 fb - 1 of data at s= 8 TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance. © 2016, CERN for the benefit of the ATLAS collaboration.
format JOUR
author Atlas Collaboration
spellingShingle Atlas Collaboration
A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
author_facet Atlas Collaboration
author_sort Atlas Collaboration
title A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
title_short A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
title_full A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
title_fullStr A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
title_full_unstemmed A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
title_sort new method to distinguish hadronically decaying boosted z bosons from w bosons using the atlas detector
url http://hdl.handle.net/20.500.12110/paper_14346044_v76_n5_p_AtlasCollaboration
work_keys_str_mv AT atlascollaboration anewmethodtodistinguishhadronicallydecayingboostedzbosonsfromwbosonsusingtheatlasdetector
AT atlascollaboration newmethodtodistinguishhadronicallydecayingboostedzbosonsfromwbosonsusingtheatlasdetector
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