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The High-Luminosity LHC (HL-LHC) will provide the unique opportunity toexplore the nature of physics beyond the Standard Model of strong andelectroweak interactions. Highly selective first-level triggers are essentialfor the physics programme of the ATLAS experiment at HL-LHC, where theinstantaneous luminosity will exceed the instantaneous LHC Run 1 luminosity byabout an order of magnitude. The ATLAS first-level muon trigger rate isdominated by low momentum muons, which are accepted because of the moderatemomentum resolution of the RPC and TGC trigger chambers. This limitation can beovercome by exploiting the data of the precision Muon Drift-Tube (MDT) chambersin the first-level trigger decision. This requires continuous fast transfer ofthe MDT hits to the off-detector trigger logic and fast track reconstructionalgorithms. The reduction of the muon trigger rate achievable with the proposednew trigger concept, the performance of a novel fast track reconstructionalgorithm, and the first hardware demonstration of the scheme with muontestbeam data taken at the CERN Gamma Irradiation Facility are discussed.

Development of a Highly Selective First-Level Muon Trigger for ATLAS at HL-LHC Exploiting Precision Muon Drift-Tube Data