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Peer-reviewed

AtlFast3: Fast Simulation in ATLAS for LHC Run 3 and Beyond

Federico Andrea Corchia, M. Bandieramonte, J. F. Beirer, J. D. Chapman, Michael Duehrssen-Debling, Florian Ernst, M. Faucci Giannelli, T. Qiu, J. Schaarschmidt, M. Firdaus M. Soberi, R. Zhang

EPJ Web of Conferences · 2025

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Summary

As we are approaching the high-luminosity era of the LHC, the computational requirements of the ATLAS experiment are expected to increase significantly in the coming years. Notably, simulation of Monte Carlo (MC) events is immensely computationally demanding, and their limited availability is one of the major sources of systematic uncertainties in many physics analyses. The main bottleneck in detector simulation is the detailed simulation of electromagnetic and hadronic showers in the ATLAS calorimeter system using Geant4. To increase MC statistics and to leverage the available CPU resources for LHC Run 3, the ATLAS Collaboration has recently put into production a refined and significantly improved version of its state-of-the-art fast simulation tool AtlFast3. AtlFast3 uses classical param

Source type
Peer-reviewed study
DOI
10.1051/epjconf/202533701355
Catalogue ID
BFmokjnw0q-dxy3jy
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