The European Physical Journal C > 2019 > 79 > 11 > 1-36
ATLAS b-jet identification performance and efficiency measurement with $$t{\bar{t}}$$ tt¯ events in pp collisions at $$\sqrt{s}=13$$ s=13 TeV
Source
Abstract
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 $$t{\bar{t}}$$ tt¯ events. The topology of the $$t \rightarrow W b$$ 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 $$\hbox {fb}^{-1}$$ fb-1 , were collected in proton–proton collisions during the years 2015–2017 at a centre-of-mass energy $$\sqrt{s}=$$ 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.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-019-7450-8 |
Authors
A. Abed Abud
- INFN Sezione di Pavia, Pavia, Italy
- Università di Pavia, Dipartimento di Fisica, Pavia, Italy