Measurement of the c-jet mistagging efficiency in tt¯ events using pp collision data at √s=13 TeV collected with the ATLAS detector
Authors
Alunno Camelia, E
Amelung, C
Amrouche, CS
Publication Date
2022Journal Title
European Physical Journal C
ISSN
1434-6044
Publisher
Springer Science and Business Media LLC
Volume
82
Issue
1
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2022). Measurement of the c-jet mistagging efficiency in tt¯ events using pp collision data at √s=13 TeV collected with the ATLAS detector. European Physical Journal C, 82 (1) https://doi.org/10.1140/epjc/s10052-021-09843-w
Abstract
A technique is presented to measure the efficiency with which $c$-jets are
mistagged as b-jets (mistagging efficiency) using $t\bar{t}$ 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 $W\to cs$ 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 $\sqrt{s} = 13$ 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 $t\bar{t}$
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.
Keywords
Regular Article - Experimental Physics
Identifiers
s10052-021-09843-w, 9843
External DOI: https://doi.org/10.1140/epjc/s10052-021-09843-w
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333475
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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