Triggers for displaced decays of long-lived neutral particles in the ATLAS detector

Understand

A set of three dedicated triggers designed to detect long-lived neutral particles decaying throughout the ATLAS detector to a pair of hadronic jets is described.

• The efficiencies of the triggers for selecting displaced decays as a function of the decay position are presented for simulated events.
• The effect of pile-up interactions on the trigger efficiencies and the dependence of the trigger rate on instantaneous luminosity during the 2012 data-taking period at the LHC are discussed.