Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV

Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV

Many measurements and searches for physics beyond the standard model at the LHC rely on the efficient identification of heavy-flavour jets, i.e. jets originating from bottom or charm quarks. In this paper, the discriminating variables and the algorithms used for heavy-flavour jet identification d...

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Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
Format: Article
Language:English
English
English
Published: Institute of Physics Publishing 2018
Subjects:
Q Science (General)
QC Physics
Online Access:http://irep.iium.edu.my/70273/
http://irep.iium.edu.my/70273/
http://irep.iium.edu.my/70273/
http://irep.iium.edu.my/70273/1/70273_Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS_article.pdf
http://irep.iium.edu.my/70273/2/70273_Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS_scopus.pdf
http://irep.iium.edu.my/70273/13/70273%20Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS%20detector%20in%20pp%20collisions%20at%2013%20TeV_wos.pdf
id iium-70273
recordtype eprints
spelling iium-702732019-07-15T01:35:53Z http://irep.iium.edu.my/70273/ Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli Q Science (General) QC Physics Many measurements and searches for physics beyond the standard model at the LHC rely on the efficient identification of heavy-flavour jets, i.e. jets originating from bottom or charm quarks. In this paper, the discriminating variables and the algorithms used for heavy-flavour jet identification during the first years of operation of the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, are presented. Heavy-flavour jet identification algorithms have been improved compared to those used previously at centre-of-mass energies of 7 and 8 TeV. For jets with transverse momenta in the range expected in simulated t¯t events, these new developments result in an efficiency of 68% for the correct identification of a b jet for a probability of 1% of misidentifying a light-flavour jet. The improvement in relative efficiency at this misidentification probability is about 15%, compared to previous CMS algorithms. In addition, for the first time algorithms have been developed to identify jets containing two b hadrons in Lorentz-boosted event topologies, as well as to tag c jets. The large data sample recorded in 2016 at a centre-of-mass energy of 13 TeV has also allowed the development of new methods to measure the efficiency and misidentification probability of heavy-flavour jet identification algorithms. The b jet identification efficiency is measured with a precision of a few per cent at moderate jet transverse momenta (between 30 and 300 GeV) and about 5% at the highest jet transverse momenta (between 500 and 1000 GeV). Institute of Physics Publishing 2018-05-08 Article NonPeerReviewed application/pdf en http://irep.iium.edu.my/70273/1/70273_Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS_article.pdf application/pdf en http://irep.iium.edu.my/70273/2/70273_Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS_scopus.pdf application/pdf en http://irep.iium.edu.my/70273/13/70273%20Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS%20detector%20in%20pp%20collisions%20at%2013%20TeV_wos.pdf Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV. Journal of Instrumentation, 13 (5). pp. 1-115. ISSN 1748-0221 https://iopscience.iop.org/article/10.1088/1748-0221/13/05/P05011/pdf 10.1088/1748-0221/13/05/P05011
repository_type Digital Repository
institution_category Local University
institution International Islamic University Malaysia
building IIUM Repository
collection Online Access
language English
English
English
topic Q Science (General)
QC Physics
spellingShingle Q Science (General)
QC Physics
Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
description Many measurements and searches for physics beyond the standard model at the LHC rely on the efficient identification of heavy-flavour jets, i.e. jets originating from bottom or charm quarks. In this paper, the discriminating variables and the algorithms used for heavy-flavour jet identification during the first years of operation of the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, are presented. Heavy-flavour jet identification algorithms have been improved compared to those used previously at centre-of-mass energies of 7 and 8 TeV. For jets with transverse momenta in the range expected in simulated t¯t events, these new developments result in an efficiency of 68% for the correct identification of a b jet for a probability of 1% of misidentifying a light-flavour jet. The improvement in relative efficiency at this misidentification probability is about 15%, compared to previous CMS algorithms. In addition, for the first time algorithms have been developed to identify jets containing two b hadrons in Lorentz-boosted event topologies, as well as to tag c jets. The large data sample recorded in 2016 at a centre-of-mass energy of 13 TeV has also allowed the development of new methods to measure the efficiency and misidentification probability of heavy-flavour jet identification algorithms. The b jet identification efficiency is measured with a precision of a few per cent at moderate jet transverse momenta (between 30 and 300 GeV) and about 5% at the highest jet transverse momenta (between 500 and 1000 GeV).
format Article
author Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
author_facet Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
author_sort Sirunyan, A. M.
title Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
title_short Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
title_full Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
title_fullStr Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
title_full_unstemmed Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
title_sort identification of heavy-flavour jets with the cms detector in pp collisions at 13 tev
publisher Institute of Physics Publishing
publishDate 2018
url http://irep.iium.edu.my/70273/
http://irep.iium.edu.my/70273/
http://irep.iium.edu.my/70273/
http://irep.iium.edu.my/70273/1/70273_Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS_article.pdf
http://irep.iium.edu.my/70273/2/70273_Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS_scopus.pdf
http://irep.iium.edu.my/70273/13/70273%20Identification%20of%20heavy-flavour%20jets%20with%20the%20CMS%20detector%20in%20pp%20collisions%20at%2013%20TeV_wos.pdf
first_indexed 2023-09-18T21:39:46Z
last_indexed 2023-09-18T21:39:46Z
_version_ 1777413061721718784

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