2011/10/20 by S. Bhattacharya, Bhattacharya, Saptaparna
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.1110.4569
openalex publication_date 2011/10/20 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
Identification of jets originating from b quarks (b-tagging) is a key element\nof many physics analyses at the LHC. Various algorithms for b-tagging have been\ndeveloped by the CMS experiment to identify b-tagged jets with a typical\nefficiency between 40% and 70% while keeping the rate of misidentified light\nquark jets between 0.1% and 10%. An important step, in order to be able to use\nthese tools in physics analysis, is the determination of the efficiency for\ntagging b-jets. Several methods to measure the efficiencies of the lifetime\nbased b-tagging algorithms are presented. Events that have jets with muons are\nused to enrich a jet sample in heavy flavor content. The efficiency measurement\nrelies on the transverse momentum of the muon relative to the jet axis or on\nsolving a system of equations which incorporate two uncorrelated taggers.\nAnother approach uses the number of b-tagged jets in top pair events to\nestimate the efficiency. The results obtained in 2010 data and the\nuncertainties obtained with the different techniques are reported. The rate of\nmisidentified light quarks have been measured using the "negative" tagging\ntechnique.\n