| Title: |
Configuration and performance of the ATLAS b-jet triggers in Run 2 |
| Authors: |
Aad, G; Abbott, B; Abbott, DC; Abed Abud, A; Abeling, K; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; Abreu, H; Abulaiti, Y; Acharya, BS; Achkar, B; Adam, L; Adam Bourdarios, C; Adamczyk, L; Adamek, L; Adelman, J; Adiguzel, A; Adorni, S; Adye, T; Affolder, AA; Afik, Y; Agapopoulou, C; Balunas, WK; Bortoletto, D; Cooper-Sarkar, AM; Ferrando, J; Frost, JA; Gallas, EJ; Gwenlan, C; Hays, CP; Iizawa, T; Merlassino, C; Mermod, P; Moser, B; Nagai, K; Nickerson, RB; Potamianos, K; Rossi, E; Schopf, E; Shipsey, IPJ; Viehhauser, GHA; Weidberg, AR |
| Publisher Information: |
SpringerOpen |
| Publication Year: |
2026 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
Several improvements to the ATLAS triggers used to identify jets containing b -hadrons ( b -jets) were implemented for data-taking during Run 2 of the Large Hadron Collider from 2016 to 2018. These changes include reconfiguring the b -jet trigger software to improve primary-vertex finding and allow more stable running in conditions with high pile-up, and the implementation of the functionality needed to run sophisticated taggers used by the offline reconstruction in an online environment. These improvements yielded an order of magnitude better light-flavour jet rejection for the same b -jet identification efficiency compared to the performance in Run 1 (2011–2012). The efficiency to identify b -jets in the trigger, and the conditional efficiency for b -jets that satisfy offline b -tagging requirements to pass the trigger are also measured. Correction factors are derived to calibrate the b -tagging efficiency in simulation to match that observed in data. The associated systematic uncertainties are substantially smaller than in previous measurements. In addition, b -jet triggers were operated for the first time during heavy-ion data-taking, using dedicated triggers that were developed to identify semileptonic b -hadron decays by selecting events with geometrically overlapping muons and jets. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1140/epjc/s10052-021-09775-5 |
| Availability: |
https://doi.org/10.1140/epjc/s10052-021-09775-5; https://ora.ox.ac.uk/objects/uuid:668c09f4-85e2-4094-9b21-54291b722bd0 |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) |
| Accession Number: |
edsbas.DFD75DD7 |
| Database: |
BASE |