Results on b-tagging identification in 8 TeV pp collisions

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 the 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 2012 at 8 TeV for a total integrated luminosity of up to 17 fb-1. The efficiency for tagging b-quark jets has been measured in events from multijet and t-quark pair production.