Strategies for b-Tagging Calibration using data at CMS

In experimental high energy physics, the capability to tag jets produced from bottom (b) quarks has become a necessity. Many Standard Model and new physics processes have a b-jet signature, including top quarks, the Higgs boson, and supersymmetry. Algorithms used to identify b-jets utilize either the lifetime of b-hadrons, or the large rate of decay to leptons, compared to hadrons from charm (c) or light (udsg) partons. It is therefore crucial to have the ability of measuring the performance of these algorithms. Methods have been developed in CMS to calculate the efficiency and mistag rate of these algorithms using data. The 2009 Europhysics Conference on High Energy Physics, July 16 - 22 2009 Krakow, Poland Speaker.