Muon Reconstruction and Identification for the Event Filter of the Atlas Experiment

Abstract

The ATLAS Trigger requires high efficiency and selectivity in order to keep the full physics potential of the experiment and to reject uninteresting processes from the 40 MHz event production rate of the LHC. These goals are achieved by a trigger composed of three sequential levels of increasing accuracy that have to reduce the output event rate down to ∼100 Hz . This work focuses on muon reconstruction and identification for the third level (Event Filter), for which specific algorithms from the off-line environment have been adapted to work in the trigger framework. Two different strategies for accessing data are described and their reconstruction potential is shown in terms of efficiency, resolution and fake muon rejection power.