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

TL;DR

This paper presents three specialized triggers for detecting long-lived neutral particles decaying into hadronic jets within the ATLAS detector, analyzing their efficiency, pile-up effects, and performance during LHC's 2012 data-taking.

Contribution

The paper introduces new dedicated triggers optimized for identifying displaced decays of long-lived neutral particles in the ATLAS detector.

Findings

Trigger efficiencies vary with decay position.

Pile-up interactions impact trigger performance.

Trigger rate depends on instantaneous luminosity.

Abstract

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.