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

Understand

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.