Identification of b-quark jets with the CMS experiment
Author(s)Apyan, Aram; Bauer, Gerry P; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Krajczar, Krisztian F.; Li, W.; Luckey Jr, P David; Ma, T.; Nahn, Steven C.; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E; Roland, Gunther M; Rudolph, Matthew Scott; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C; Sung, K.; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wolf, Roger; Wyslouch, Boleslaw; Yang, M.; Yilmaz, Yetkin; Yoon, A.S.; Zanetti, Marco; ... Show more Show less
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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 √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 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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of Instrumentation
Chatrchyan, S. et al. "Identification of b-quark jets with the CMS experiment." Journal of Instrumentation 5 (April 2013): P04013 © 2013 IOP Publishing Ltd and Sissa Medialab
Final published version