Energy scale and resolution for anti-$k_t$ jets with radius parameters $R=0.2$ and 0.6 measured in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

Jets with different radius parameters $R$ are an important tool to probe quantum chromodynamics processes at different angular scales. Jets with small $R=0.2$ are instrumental in measurements of the substructure of large-$R$ jets resulting from collimated hadronic decays of energetic $W$, $Z$, and Higgs bosons, top quarks, and of potential new resonances. Measurements are presented of the energy scale and resolution of jets with radius parameters $R=0.2$ and 0.6 obtained with the ATLAS detector using $37{\text{fb}}^{-1}$ of proton--proton collisions from the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=13$ TeV, with their associated uncertainties. A new in situ method to measure jet energy scale differences between data and Monte Carlo simulations is presented. The systematic uncertainties in the jet energy scale for central jets ($|\eta |<1.2$) typically vary from 1% to about 5% as a function of $|\eta |$ at very low transverse momentum, $p_{\text{T}}$, of around 20 GeV for both $R=0.2$ and 0.6 jets. The relative energy resolution ranges from $(35\pm 6)$% at $p_{\text{T}}=20$ GeV to $(6\pm 0.5)$% at $p_{\text{T}}=300$ GeV for central $R=0.2$ jets, and is found to be slightly worse for $R=0.6$ jets. Finally, the effect of close-by hadronic activity on the jet energy scale is investigated and is found to be well modelled by the ATLAS Monte Carlo simulations.

63 pages in total, author list starting page 46, 30 figures, 2 tables, published on Eur. Phys. J. C. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/JETM-2019-01

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