Development of the muon trigger for new particle searches at LHC ATLAS Experiment

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An algorithm for the online event selection (trigger) for muons was developed in the ATLAS experiment at the LHC, the highest energy proton-proton collider. The momentum resolution and the trigger efficiency were improved, while the processing time was kept fast. This algorithm was used in the ATLAS data taking in the year 2012. Many physics results, including the discovery of the Higgs boson, have been achieved by using these data triggered by the muon trigger that includes this new algorithm.In addition, to enhance the sensitivity for instance to the R-parity violating supersymmetry search, a muon trigger only with the muon detector information was exploited. In order to reduce the high rate of this trigger in particular in the endcap region of the detector, a new reconstruction method of muon segment and also a new momentum reconstruction method using new detectors were developed. A higher rejection on backgrounds and an improved momentum resolution were achieved.