Measurement of the c-jet mistagging efficiency in $t\bar{t}$ events using pp collision data at $\sqrt{s}=13$ $\text {TeV}$ collected with the ATLAS detector - INSPIRE

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Measurement of the c-jet mistagging efficiency in $t\bar{t}$ events using pp collision data at $\sqrt{s}=13$ $\text {TeV}$ collected with the ATLAS detector

ATLAS

Collaboration

Sep 22, 2021

39 pages

Published in:

Eur.Phys.J.C 82 (2022) 1, 95

Published: Jan 31, 2022

e-Print:

2109.10627 [hep-ex]

DOI:

10.1140/epjc/s10052-021-09843-w

Report number:

CERN-EP-2021-166

Experiments:

CERN-LHC-ATLAS

View in:

reference search159 citations

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Abstract: (Springer)

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\rightarrow 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

\text {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.

Note:

39 pages in total, author list starting page 23, 6 figures, 2 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/FTAG-2020-08

p p: colliding beams
top: pair production
jet: transverse momentum
p p: scattering
jet: bottom
bottom: particle identification
charm: particle identification
particle identification: efficiency
ATLAS
CERN LHC Coll

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