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Measurement of the c-jet mistagging efficiency in tt ̄ events using pp collision data at √s=13 TeV collected with the ATLAS detector

Aad G.
•
Abbott B.
•
Abbott D. C.
altro
Zwalinski L.
2022
  • journal article

Periodico
THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS
Abstract
A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using tt ̄ events, where one of the W bosons decays into an electron or muon and a neutrino and the other decays into a quark–antiquark pair. The measurement utilises the relatively large and known W→ cs branching ratio, which allows a measurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at s=13 TeV and corresponds to an integrated luminosity of 139 fb- 1. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and tt ̄ decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3–17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent b-jet tagging requirement.
DOI
10.1140/epjc/s10052-021-09843-w
WOS
WOS:000750507100004
Archivio
http://hdl.handle.net/11390/1221602
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85124839192
https://ricerca.unityfvg.it/handle/11390/1221602
Diritti
open access
google-scholar
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