Performance of b-jet identification in the ATLAS experiment

Barton, Adam Edward and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Maddocks, Harvey and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (2016) Performance of b-jet identification in the ATLAS experiment. Journal of Instrumentation, 11 (4). ISSN 1748-0221

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Abstract

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: Journal Article
Journal or Publication Title: Journal of Instrumentation
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2600/2610
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 79709
Deposited By: ep_importer_pure
Deposited On: 23 May 2016 09:40
Refereed?: Yes
Published?: Published
Last Modified: 11 Dec 2019 04:37
URI: https://eprints.lancs.ac.uk/id/eprint/79709

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