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Identification of b-quark jets with the CMS experiment

Abstract : 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 sqrt(s) = 7 TeV for a total integrated luminosity of 5.0 inverse femtobarns. 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%. 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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http://hal.in2p3.fr/in2p3-00754036
Contributor : Sylvie Flores <>
Submitted on : Tuesday, November 20, 2012 - 7:40:31 AM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

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S. Chatrchyan, M. Besançon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Identification of b-quark jets with the CMS experiment. Journal of Instrumentation, IOP Publishing, 2013, 8, pp.P04013. ⟨10.1088/1748-0221/8/04/P04013⟩. ⟨in2p3-00754036⟩

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