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ATLAS b-jet identification performance and efficiency measurement with t(t)over-bar events in pp collisions at √s=13 TeV
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ATLAS b-jet identification performance and efficiency measurement with t(t)over-bar events in pp collisions at √s=13 TeV

G. Aad, B. Abbott, D. C. Abbott, A. Abed Abud, K. Abeling, D. K. Abhayasinghe, S. H. Abidi, O. S. AbouZeid, N. L. Abraham, H. Abramowicz, …
The European physical journal. C, Particles and fields, 卷.79(11), 970
01/11/2019
DOI: https://doi.org/10.1140/epjc/s10052-019-7450-8
Web of Science ID: WOS:000505550300004

摘要

Physical Sciences Physics Physics, Particles & Fields Science & Technology
The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b-hadrons is measured in collision data. The measurement uses a likelihood-based method in a sample highly enriched in t (t) over bar events. The topology of the t -> Wb decays is exploited to simultaneously measure both the jet flavour composition of the sample and the efficiency in a transverse momentum range from 20 to 600 GeV. The efficiency measurement is subsequently compared with that predicted by the simulation. The data used in this measurement, corresponding to a total integrated luminosity of 80.5 fb(-1), were collected in proton-proton collisions during the years 2015-2017 at a centre-of-mass energy root s = 13 TeV. By simultaneously extracting both the efficiency and jet flavour composition, this measurement significantly improves the precision compared to previous results, with uncertainties ranging from 1 to 8% depending on the jet transverse momentum.

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