ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at s√=13 TeV

Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Franconi, Laura; Weston, Thomas Daniel (2019). ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at s√=13 TeV. The European physical journal. C, Particles and fields, 79(11) Springer 10.1140/epjc/s10052-019-7450-8

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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

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Franconi, Laura and Weston, Thomas Daniel

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

Springer

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

02 Jun 2020 13:01

Last Modified:

07 Jun 2020 02:51

Publisher DOI:

10.1140/epjc/s10052-019-7450-8

Additional Information:

Kollaboration - Es sind nur die Berner Forschenden erwaehnt; The ATLAS collaboration

BORIS DOI:

10.7892/boris.143564

URI:

https://boris.unibe.ch/id/eprint/143564

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