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Highly selective triggers are essential for the physics programme of theATLAS experiment at HL-LHC where the instantaneous luminosity will be about anorder of magnitude larger than the LHC instantaneous luminosity in Run 1. Thefirst level muon trigger rate is dominated by low momentum muons below thenominal trigger threshold due to the moderate momentum resolution of theResistive Plate and Thin Gap trigger chambers. The resulting high trigger ratesat HL-LHC can be sufficiently reduced by using the data of the precision MuonDrift Tube chambers for the trigger decision. This requires the implementationof a fast MDT read-out chain and of a fast MDT track reconstruction algorithmwith a latency of at most 6 microseconds. A hardware demonstrator of the fastread-out chain has been successfully tested at the HL-LHC operating conditionsat the CERN Gamma Irradiation Facility. The fast track reconstruction algorithmhas been implemented on a fast trigger processor.

A Highly Selective First-Level Muon Trigger With MDT Chamber Data for ATLAS at HL-LHC