Performance of <i>b</i>-jet identification in the ATLAS experiment

Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R
et al (show 2819 more authors) (2016) Performance of <i>b</i>-jet identification in the ATLAS experiment. JOURNAL OF INSTRUMENTATION, 11 (04). P04008-.

[thumbnail of 1512.01094v2.pdf] Text
1512.01094v2.pdf - Published version

Download (2MB)


The identification of jets containing $b$ hadrons is important for the physics programme of the ATLAS experiment at the Large Hadron Collider. Several algorithms to identify jets containing $b$ hadrons are described, ranging from those based on the reconstruction of an inclusive secondary vertex or the presence of tracks with large impact parameters to combined tagging algorithms making use of multi-variate discriminants. An independent $b$-tagging algorithm based on the reconstruction of muons inside jets as well as the $b$-tagging algorithm used in the online trigger are also presented.The $b$-jet tagging efficiency, the $c$-jet tagging efficiency and the mistag rate for light flavour jets in data have been measured with a number of complementary methods. The calibration results are presented as scale factors defined as the ratio of the efficiency (or mistag rate) in data to that in simulation. In the case of $b$ jets, where more than one calibration method exists, the results from the various analyses have been combined taking into account the statistical correlation as well as the correlation of the sources of systematic uncertainty.

Item Type: Article
Additional Information: 111 pages plus author list + cover page (128 pages total), 55 figures, 17 tables, submitted to JINST, All figures including auxiliary figures are available at
Uncontrolled Keywords: Large detector systems for particle and astroparticle physics, Large detector-systems performance, Pattern recognition, cluster finding, calibration and fitting methods, Performance of High Energy Physics Detectors
Depositing User: Symplectic Admin
Date Deposited: 21 Feb 2017 14:29
Last Modified: 17 Oct 2023 02:02
DOI: 10.1088/1748-0221/11/04/P04008
Related URLs: