Summer Student Programme
Published September 15, 2025 | Version v1
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Evolution of trigger efficiency through LHC Run 3

Authors/Creators

Contributors

  • 1. ROR icon European Organization for Nuclear Research
  • 2. ROR icon Barcelona Institute for Science and Technology
  • 3. Institute of Nuclear Physics Polish Academy of Sciences
  • 4. ROR icon University College London

Description

The trigger system of the ATLAS experiment is crucial for the success of the experiment, since it selects in real time the interesting collisions at the rate of a few Hz out of the 40 MHz collision rate. The reference to compute the performance of many triggers is given by the Minimum Bias Trigger Scintillators (MBTS), a detector built on purpose to give a very fast signal any time it is crossed by even a single charged particle, with an efficiency close to 100%. Due to radiation damage and saturation effects, large deviations from this ideal behaviours have been recently observed, and it is important to extend these studies to the whole of Run3 data taking, and to study the relation with other triggers. This project is very important for the ATLAS trigger system, and for all analyses willing to use MBTS and jet triggers.

Files

Evolution of trigger efficiency through Run 3.pdf

Files (2.7 MB)

Additional details

CERN

Department
EP - Experimental Physics Department
Experiment
ATLAS

References

  • Sidoti, A., ATLAS Collaboration. Minimum Bias Trigger Scintillators in ATLAS Run II. CERN, 2014. CERN Document Server Record No. 1708408. DOI: https://doi.org/10.1088/1748-0221/ 9/10/C10020.
  • CERN. Heavy ions and quark-gluon plasma. CERN Accelerating Science (web page). Available at: https://home.cern/science/physics/heavy-ions-and-quark-gluon-plasma. Accessed: 1 September 2025.
  • Spiwoks, R., Ask, S., Ellis, N., Farthouat, P., G¨alln¨o, P., Haller, J., Krasznahorkay, A., Maeno, T., Pauly, T., Pessoa Lima Jr., H., Resurreccion Arcas, I., Schuler, G., de Seixas, J. M., Torga Teixeira, R., and Wengler, T. The ATLAS Level-1 Central Trigger Processor (CTP). CERN, 2005. CERN Document Server Record No. 889547. Available at: https://cds.cern.ch/record/ 889547/files/p265.pdf. Accessed: 5 September 2025.
  • ATLAS Collaboration. Operation and performance of the ATLAS tile calorimeter in LHC Run 2. European Physical Journal C, 84(12), 1313, 2024, pp. 1–53. DOI: https://doi.org/10.1140/ epjc/s10052-024-13151-4.
  • ATLAS Collaboration. Introduction to Rucio. ATLAS Analysis Software Tutorial. CERN, 2025. Available at: https://atlassoftwaredocs.web.cern.ch/analysis-software/ AnalysisSWTutorial/rucio_intro/. Accessed: 5 September 2025

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