Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 94: Trigger+DAQ 3

T 94.7: Talk

Thursday, March 7, 2024, 17:30–17:45, Geb. 30.23: 3/1

A New Track Fit for the ATLAS Event Filter — •Abhirikshma Nandi, André Schöning, Sebastian Dittmeier, and Christof Sauer — Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany

The ATLAS experiment is going through a comprehensive set of upgrades in preparation for data taking at the High-Luminosity Large Hadron Collider. The Trigger and Data Acquisition (TDAQ) systems are being upgraded to handle an increased trigger rate and run even more sophisticated algorithms online to retain performance in the face of increased event complexity. The ATLAS Event Filter (EF) has to provide the second level of filtering, reducing the Level-0 trigger rate of 1 MHz to 10 KHz for storage. To this end, it is required to perform track reconstruction (EF Tracking) for the entire Inner Tracker (ITk) at a maximum rate of 150 kHz. A new, parallelizable track fit, based on hit triplets, is being developed for EF Tracking. The general triplet fit is a generalization of the Multiple Scattering-only triplet fit, developed originally for the Mu3e experiment, and includes hit uncertainties. Results from the general triplet track fit will be summarized along with an overview of the work in the broader context of the EF Tracking project.

Keywords: ATLAS; TDAQ; Event Filter; Track Fitting; Triplet