Efficiency measurement of b-tagging algorithms developed by the CMS experiment

TL;DR

This paper discusses methods developed by CMS to measure the efficiency of b-tagging algorithms crucial for physics analyses at the LHC, using various data-driven techniques and addressing misidentification rates.

Contribution

The paper introduces multiple data-driven methods for measuring b-tagging efficiency and misidentification rates in CMS detector data.

Findings

Measured b-tagging efficiencies between 40% and 70%.

Estimated misidentification rates for light quark jets between 0.1% and 10%.

Reported uncertainties for efficiency measurements based on 2010 data.

Abstract

Identification of jets originating from b quarks (b-tagging) is a key element of many physics analyses at the LHC. Various algorithms for b-tagging have been developed by the CMS experiment to identify b-tagged jets with a typical efficiency between 40% and 70% while keeping the rate of misidentified light quark jets between 0.1% and 10%. An important step, in order to be able to use these tools in physics analysis, is the determination of the efficiency for tagging b-jets. Several methods to measure the efficiencies of the lifetime based b-tagging algorithms are presented. Events that have jets with muons are used to enrich a jet sample in heavy flavor content. The efficiency measurement relies on the transverse momentum of the muon relative to the jet axis or on solving a system of equations which incorporate two uncorrelated taggers. Another approach uses the number of b-tagged jets in top pair events to estimate the efficiency. The results obtained in 2010 data and the uncertainties obtained with the different techniques are reported. The rate of misidentified light quarks have been measured using the "negative" tagging technique.