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A technique is presented to measure the efficiency with which $c$-jets aremistagged as b-jets (mistagging efficiency) using $t\bar{t}$ events, where oneof the $W$ bosons decays into an electron or muon and a neutrino and the otherdecays into a quark-antiquark pair. The measurement utilises the relativelylarge and known $W\to cs$ branching ratio, which allows a measurement to bemade in an inclusive $c$-jet sample. The data sample used was collected by theATLAS detector at $\sqrt{s} = 13$ TeV and corresponds to an integratedluminosity of 139 fb$^{-1}$. Events are reconstructed using a kinematiclikelihood technique which selects the mapping between jets and $t\bar{t}$decay products that yields the highest likelihood value. The distribution ofthe $b$-tagging discriminant for jets from the hadronic $W$ decays in data iscompared with that in simulation to extract the mistagging efficiency as afunction of jet transverse momentum. The total uncertainties are in the range3%-17%. The measurements generally agree with those in simulation but there aresome differences in the region corresponding to the most stringent $b$-jettagging requirement.

european physical journal. c, particles and fields

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