Fast b-tagging at the high-level trigger of the ATLAS experiment in LHC Run 3
The ATLAS experiment relies on real-time hadronic jet reconstruction and b-tagging to record fully hadronic events containing b-jets. These algorithms require track reconstruction, which is computationally expensive and could overwhelm the high-level-trigger farm, even at the reduced event rate that...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
November 2023
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| In: |
Journal of Instrumentation
Year: 2023, Volume: 18, Issue: 11, Pages: 1-38 |
| ISSN: | 1748-0221 |
| DOI: | 10.1088/1748-0221/18/11/P11006 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1088/1748-0221/18/11/P11006 Verlag, kostenfrei, Volltext: https://dx.doi.org/10.1088/1748-0221/18/11/P11006 
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| Author Notes: | The ATLAS collaboration* |
MARC
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| 500 | |a Veröffentlicht: 10. November 2023 | ||
| 500 | |a *The ATLAS collaboration: G. Aad, L.M. Baltes, F. Bartels, M.M. Czurylo, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und 2909 weitere Personen] | ||
| 500 | |a Gesehen am 03.07.2025 | ||
| 520 | |a The ATLAS experiment relies on real-time hadronic jet reconstruction and b-tagging to record fully hadronic events containing b-jets. These algorithms require track reconstruction, which is computationally expensive and could overwhelm the high-level-trigger farm, even at the reduced event rate that passes the ATLAS first stage hardware-based trigger. In LHC Run 3, ATLAS has mitigated these computational demands by introducing a fast neural-network-based b-tagger, which acts as a low-precision filter using input from hadronic jets and tracks. It runs after a hardware trigger and before the remaining high-level-trigger reconstruction. This design relies on the negligible cost of neural-network inference as compared to track reconstruction, and the cost reduction from limiting tracking to specific regions of the detector. In the case of Standard Model HH → bb̅bb̅, a key signature relying on b-jet triggers, the filter lowers the input rate to the remaining high-level trigger by a factor of five at the small cost of reducing the overall signal efficiency by roughly 2%. | ||
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