Abstract
A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using tt̅ 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 tt̅ 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.
Original language | English |
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Article number | 95 |
Number of pages | 27 |
Journal | European Physical Journal C |
Volume | 82 |
Issue number | 1 |
DOIs | |
Publication status | Published - 31 Jan 2022 |
Bibliographical note
39 pages in total, author list starting page 23, 6 figures, 2 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/FTAG-2020-08Keywords
- hep-ex