Performance of b-Tagging Algorithms in 25ns Data at 13TeV

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 2015 at $\sqrt s$ = 13 TeV with a bunch spacing of 25ns and for a total integrated luminosity of around 2.4 fb$^{-1}$. The efficiency for tagging b-quark jets and mistagging non-b quark jets has been measured in events from multijet production. Variables related to b-tagging are also shown for boosted multijet and top quark topologies.