Track Reconstruction in the ATLAS High Level Trigger Using Cosmic Ray Muons

The large collision rate together with the complicated event signatures at the LHC implies critical requirements on the trigger system. One very important ingredient of the event selection is the track reconstruction capability. We present the track reconstruction performed in the ATLAS trigger system based on data from the inner detector and the results obtained from cosmic ray muon tracks used for the trigger decision. The results show a good overall performance, consistent with expectations.