Identification of b-quark jets with the CMS experiment

By Cms Collaboration. 2012

743 citations recorded by the source corpus.

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 √ s = 7 TeV 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 bjet 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. Submitted to the Journal of Instrumentation c © 2014 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license ∗See Appendix A for the list of collaboration members ar X iv :1 21 1. 44 62 v2 [ he pex ] 2 9 M ay 2 01 3

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4648b714043ecf6da929d879a5b0b6d76dad713d

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Citations in the corpus

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Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8 TeV (2014, methodology): “Jets originating from the decay of a b quark are tagged based on the presence of a secondary vertex, identified using a multivariate algorithm combining tracking information in a discriminant [28].”
Measurement of the t-channel single-top-quarkproduction cross section and of the |Vtb| CKM matrixelement in pp collisions at √s = 8 TeV (2014, methodology): “• B-tagging: B-tagging and misidentification (mis-tag) efficiencies are estimated from control samples [29].”
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