PoS - Proceedings of Science
Volume 450 - The Eleventh Annual Conference on Large Hadron Collider Physics (LHCP2023) - session Poster session
Optimization of light-by-light triggers from 2022 pilot lead-lead run in ATLAS
K. Domijan*  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: January 15, 2024
Published on:
Light-by-light scattering (LbyL, $\gamma \gamma \rightarrow \gamma \gamma$) is a very rare and interesting phenomenon, impossible to measure in standard hadronic lead-lead collisions. Its final state consists of a low-energetic pair of photons with the absence of any other activity in the detector. These di-photon events proved to be a powerful tool for new physics searches involving axion-like particles. A new large sample of lead-lead data is collected in the fall of 2023 as part of Run-3 operations at the LHC. It will provide access to more exclusive events including the LbyL process. Trigger preparations are an important aspect of each data-taking campaign. In particular, small rates of the LbyL process in comparison with the huge activity in the detector from other processes imply the development of special triggering techniques. In this document, some ideas for efficient triggering of events with low-$p_\mathrm{T}$ electrons and photons are discussed. The first approach involves studies with a dedicated set of triggers deployed in the lead-lead pilot run recorded in November 2022 by the ATLAS experiment. In particular, the estimation of the trigger efficiency for selections based on the hardware-level trigger (so-called level 1) from the pilot run is discussed.
DOI: https://doi.org/10.22323/1.450.0265
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