In situ calibration of large-$R$ jet energy and mass in 13 TeV proton-proton collisions with the ATLAS detector

Abstract

The response of the ATLAS detector to large-radius jets is measured in situ using 36.2 fb${}^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collisions provided by the LHC and recorded by the ATLAS experiment during 2015 and 2016. The jet energy scale is measured in events where the jet recoils against a reference object, which can be either a calibrated photon, a reconstructed $Z$ boson, or a system of well-measured small-radius jets. The jet energy resolution and a calibration of forward jets are derived using dijet balance measurements. The jet mass response is measured with two methods: using mass peaks formed by $W$ bosons and top quarks with large transverse momenta and by comparing the jet mass measured using the energy deposited in the calorimeter with that using the momenta of charged-particle tracks. The transverse momentum and mass responses in simulations are found to be about 2-3% higher than in data. This difference is adjusted for with a correction factor. The results of the different methods are combined to yield a calibration over a large range of transverse momenta ($p_{\mathrm{T}}$). The precision of the relative jet energy scale is 1-2% for $200\mathrm{GeV}<p_{\mathrm{T}}<2\mathrm{TeV}$, while that of the mass scale is 2-10%. The ratio of the energy resolutions in data and simulation is measured to a precision of 10-15% over the same $p_{\mathrm{T}}$ range.

70 pages in total, author list starting page 54, 32 figures, 5 tables, final version published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/JETM-2018-02/

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