Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Measurements of b-jet tagging efficiency with the ATLAS detector using tt̅ events at √s = 13 TeV. Journal of High Energy Physics, 2018(8) Springer 10.1007/JHEP08(2018)089
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Aaboud2018_Article_MeasurementsOfB-jetTaggingEffi.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (1MB) | Preview |
The efficiency to identify jets containing b-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (tt̅ ) selected from the 36.1 fb⁻¹ of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy √s = 13TeV. Two methods are used to extract the efficiency from tt̅ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b-tagging information, is used to select events in which two b-jets are present, which reduces the dominant uncertainty in the modelling of the avour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) |
UniBE Contributor: |
Haug, Sigve, Weber, Michele, Beck, Hans Peter |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1029-8479 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
BORIS Import LHEP |
Date Deposited: |
25 Jun 2019 10:57 |
Last Modified: |
05 Dec 2022 15:27 |
Publisher DOI: |
10.1007/JHEP08(2018)089 |
ArXiv ID: |
1805.01845 |
Additional Information: |
Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt |
BORIS DOI: |
10.7892/boris.129055 |
URI: |
https://boris.unibe.ch/id/eprint/129055 |
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