Details

Autor(en) / Beteiligte

• Aad, G
• Abbott, B
• Abbott, D. C
• Abud, A. Abed
• Abeling, K
• Abhayasinghe, D. K
• Abidi, S. H

Titel

ATLAS b-jet identification performance and efficiency measurement with [Formula omitted] events in pp collisions at [Formula omitted] TeV

Ist Teil von

• The European physical journal. C, Particles and fields, 2019-11, Vol.79 (11), p.1-36

Ort / Verlag

Heidelberg: Springer

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 [Formula omitted] events. The topology of the [Formula omitted] 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 [Formula omitted], were collected in proton-proton collisions during the years 2015-2017 at a centre-of-mass energy [Formula omitted] 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.