Speaker
Description
As the Large Hadron Collider enters the High-Luminosity era, several sub-detectors require major upgrades. The ATLAS High Granularity Timing Detector (HGTD), currently under development for the HL-LHC, is designed to mitigate pile-up levels of up to ~200 simultaneous proton-proton interactions by providing precise timing information in the forward region (roughly 2.4 < |\eta| < 4.0). When vertex separation in z becomes insufficient, per-track timing (targeting \mathcal{O}(30\text{–}50\ \text{ps})) improves track-to-vertex association and thus enhances object reconstruction and background rejection. The HGTD will complement the upgraded all-silicon Inner Tracker (ITk) by adding a timing coordinate to spatial tracking. This talk presents simulation studies of the HGTD’s timing performance, the effects on the time resolution, and the calibration strategies explored to date.
