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Title
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Identification of b-quark jets with the CMS experiment
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| At the Large Hadron Collider, the identification of jets originating from b quarks is important for searches for new physics and for measurements of standard model processes. A variety of algorithms has been developed by CMS to select b-quark jets based on variables such as the impact parameters of charged-particle tracks, the properties of reconstructed decay vertices, and the presence or absence of a lepton, or combinations thereof. The performance of these algorithms has been measured using data from proton-proton collisions at the LHC and compared with expectations based on simulation. The data used in this study were recorded in 2011 at root s = 7TeV for a total integrated luminosity of 5.0 fb(-1). The efficiency for tagging b-quark jets has been measured in events from multijet and t-quark pair production. CMS has achieved a b-jet tagging efficiency of 85% for a light-parton misidentification probability of 10% in multijet events. For analyses requiring higher purity, a misidentification probability of only 1.5% has been achieved, for a 70% b-jet tagging efficiency. |
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Language
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English
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Source (journal)
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Journal of instrumentation. - Bristol, 2006, currens
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Publication
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Bristol
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Institute of Physics
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2013
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ISSN
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1748-0221
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DOI
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10.1088/1748-0221/8/04/P04013
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Volume/pages
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8
(2013)
, p. 1-66
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Article Reference
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P04013
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ISI
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000317462400020
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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