Tracking studies for b-tagging with 7 TeV collision data with the ATLAS detector

The ability to identify jets containing $b$-hadrons is important for the high-$pt$ physics program of a general-purpose experiment at the LHC such as ATLAS. This capability relies on the very accurate measurements of the parameters of charged tracks provided by the ATLAS Inner Detector. Using the 7~TeV collision data collected by the experiment in early 2010, the tracking performance of the ATLAS Inner Detector has been assessed. Some of the studies relevant for $b$-tagging are discussed in this note, in particular the track properties and notably the impact parameter resolution.