Configuration, Performance, and Commissioning of the ATLAS b-jet Triggers for the 2022 and 2023 LHC data-taking periods

ATLAS Collaboration, S. Alderweireldt, P. J. Clark, D. Duda, S. M. Farrington, Y. Gao, J.M. Gargan, R.Y. Gonzalez Andana, C. Jiang, C. Leonidopoulos, M. Soberi, V. J. Martin, L. Mijović, E.A. Pender, T. Qiu, A.L. Sopio, F. Ustuner, E.M. Villhauer, H Watson, B.M. WynneZ. Xu

Research output: Contribution to journalArticlepeer-review

Abstract

In 2022 and 2023, the Large Hadron Collider producedapproximately two billion hadronic interactions each second frombunches of protons that collide at a rate of 40 MHz. The ATLAStrigger system is used to reduce this rate to a few kHz forrecording. Selections based on hadronic jets, their energy, andevent topology reduce the rate to 𝒪(10) kHz whilemaintaining high efficiencies for important signatures resulting in b-quarks, but to reach the desired recording rate of hundreds ofHz, additional real-time selections based on the identification ofjets containing b-hadrons (b-jets) are employed to achieve lowthresholds on the jet transverse momentum at the High-Level Trigger.The configuration, commissioning, and performance of the real-timeATLAS b-jet identification algorithms for the early LHC Run 3collision data are presented. These recent developments providesubstantial gains in signal efficiency for critical signatures; forthe Standard Model production of Higgs boson pairs, a 50%improvement in selection efficiency is observed in final states withfour b-quarks or two b-quarks and two hadronically decaying τ-leptons.
Original languageEnglish
Article numberP03002
Pages (from-to)1-44
Number of pages44
JournalJournal of Instrumentation
Volume20
DOIs
Publication statusPublished - 4 Mar 2025

Keywords / Materials (for Non-textual outputs)

  • Particle identification methods
  • Trigger detectors

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