Speaker
Description
Events containing muons in the final state are an important signature
for many analyses being carried out at the Large Hadron Collider
(LHC), including both standard model measurements and searches for new
physics. To be able to study such events, it is required to have an
efficient and well-understood muon trigger. The ATLAS muon trigger
consists of a hardware based system (Level 1), as well as a software
based reconstruction (High Level Trigger). Due to high luminosity and
pile up conditions in Run-2, several improvements have been
implemented to keep the trigger rate low while still maintaining a
high efficiency. Some examples of recent improvements include
requiring coincidence hits between different layers of the muon
spectrometer, improvements for handling overlapping muons, and
optimised muon isolation. We will present an overview of how we
trigger on muons, recent improvements, and the performance of the muon
trigger in Run-2 data.
