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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Institute of Physics Publishing
2018
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| Subjects: | |
| 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 |
| Summary: | 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). |
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