Configuration and performance of the ATLAS b-jet triggers in Run 2
Authors
Abraham, NL
Alunno Camelia, E
Amelung, C
Amrouche, CS
Andrei, V
Anelli, CR
Pereira, RA
Publication Date
2021Journal Title
European Physical Journal C
ISSN
1434-6044
Publisher
Springer Science and Business Media LLC
Volume
81
Issue
12
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abed Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2021). Configuration and performance of the ATLAS b-jet triggers in Run 2. European Physical Journal C, 81 (12) https://doi.org/10.1140/epjc/s10052-021-09775-5
Abstract
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.
Keywords
Regular Article - Experimental Physics
Identifiers
s10052-021-09775-5, 9775
External DOI: https://doi.org/10.1140/epjc/s10052-021-09775-5
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333512
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.
Recommended or similar items
The current recommendation prototype on the Apollo Repository will be turned off on 03 February 2023. Although the pilot has been fruitful for both parties, the service provider IKVA is focusing on horizon scanning products and so the recommender service can no longer be supported. We recognise the importance of recommender services in supporting research discovery and are evaluating offerings from other service providers. If you would like to offer feedback on this decision please contact us on: support@repository.cam.ac.uk