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| Format: | Preprint |
| Veröffentlicht: |
2025
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| Online-Zugang: | https://arxiv.org/abs/2501.11420 |
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| _version_ | 1866916656498868224 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | In 2022 and 2023, the Large Hadron Collider produced approximately two billion hadronic interactions each second from bunches of protons that collide at a rate of 40 MHz. The ATLAS trigger system is used to reduce this rate to a few kHz for recording. Selections based on hadronic jets, their energy, and event topology reduce the rate to $\mathcal O(10)$ kHz while maintaining high efficiencies for important signatures resulting in $b$-quarks, but to reach the desired recording rate of hundreds of Hz, additional real-time selections based on the identification of jets containing $b$-hadrons ($b$-jets) are employed to achieve low thresholds on the jet transverse momentum at the High-Level Trigger. The configuration, commissioning, and performance of the real-time ATLAS $b$-jet identification algorithms for the early LHC Run 3 collision data are presented. These recent developments provide substantial gains in signal efficiency for critical signatures; for the Standard Model production of Higgs boson pairs, a 50% improvement in selection efficiency is observed in final states with four $b$-quarks or two $b$-quarks and two hadronically decaying $τ$-leptons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_11420 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Configuration, Performance, and Commissioning of the ATLAS $b$-jet Triggers for the 2022 and 2023 LHC data-taking periods ATLAS Collaboration High Energy Physics - Experiment In 2022 and 2023, the Large Hadron Collider produced approximately two billion hadronic interactions each second from bunches of protons that collide at a rate of 40 MHz. The ATLAS trigger system is used to reduce this rate to a few kHz for recording. Selections based on hadronic jets, their energy, and event topology reduce the rate to $\mathcal O(10)$ kHz while maintaining high efficiencies for important signatures resulting in $b$-quarks, but to reach the desired recording rate of hundreds of Hz, additional real-time selections based on the identification of jets containing $b$-hadrons ($b$-jets) are employed to achieve low thresholds on the jet transverse momentum at the High-Level Trigger. The configuration, commissioning, and performance of the real-time ATLAS $b$-jet identification algorithms for the early LHC Run 3 collision data are presented. These recent developments provide substantial gains in signal efficiency for critical signatures; for the Standard Model production of Higgs boson pairs, a 50% improvement in selection efficiency is observed in final states with four $b$-quarks or two $b$-quarks and two hadronically decaying $τ$-leptons. |
| title | Configuration, Performance, and Commissioning of the ATLAS $b$-jet Triggers for the 2022 and 2023 LHC data-taking periods |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2501.11420 |