TY - JOUR
T1 - ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at √s=13 TeV
AU - ATLAS Collaboration
AU - Aad, G.
AU - Åkesson, Torsten
AU - Bocchetta, Simona
AU - Bryngemark, Lene
AU - Corrigan, Eric Edward
AU - Doglioni, Caterina
AU - Gregersen, Kristian
AU - Brottmann Hansen, Eva
AU - Hedberg, Vincent
AU - Jarlskog, Göran
AU - Kalderon, Charles
AU - Kellermann, Edgar
AU - Konya, Balazs
AU - Lytken, Else
AU - Mankinen, Katja
AU - Marcon, Caterina
AU - Mjörnmark, Ulf
AU - Mullier, Geoffrey André Adrien
AU - Pöttgen, Ruth
AU - Poulsen, Trine
AU - Skorda, Eleni
AU - Smirnova, Oxana
AU - Zwalinski, L.
PY - 2019/11/25
Y1 - 2019/11/25
N2 - 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 tt¯ 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 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.
AB - 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 tt¯ 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 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.
UR - https://scopus.com/record/display.uri?eid=2-s2.0-85075996723&origin=inward&txGid=1ca320b031c9431474f023635ff1c32d#
U2 - 10.1140/epjc/s10052-019-7450-8
DO - 10.1140/epjc/s10052-019-7450-8
M3 - Article
SN - 1434-6044
VL - 79
JO - European Physical Journal C
JF - European Physical Journal C
IS - 11
M1 - 970
ER -