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

ATLAS Publications, T.M. Carter, A. Hasib, M.P. Heath, S. Palazzo, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using t ¯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 → 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 t ¯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.
Original languageEnglish
Article number95
Pages (from-to)1-27
Number of pages27
JournalThe European Physical Journal C
Volume82
Issue number1
DOIs
Publication statusPublished - 31 Jan 2022

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