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 for probing quantum chromodynamics processes at different angular scales. Jets with small $$R=0.2$$ 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. This paper presents measurements of the energy scale, resolution, and associated uncertainties of jets with radius parameters $$R=0.2$$ R = 0.2 and 0.6, obtained using the ATLAS detector. The results are based on $$37~\text {fb}^{-1}$$ 37 fb - 1 of proton–proton collision data from the Large Hadron Collider at a centre-of-mass energy of $$\sqrt{s}=13$$ s = 13 TeV. A new in situ method for measuring jet energy scale differences between data and Monte Carlo simulations is presented. The systematic uncertainties in the jet energy scale for central jets $$(|\eta | < 1.2)$$ ( | η | < 1.2 ) typically vary from 1% to about 5% as a function of $$|\eta |$$ | η | at very low transverse momentum, $$p_{\text {T}},$$ p T , of around 20 GeV for both $$R=0.2$$ R = 0.2 and 0.6 jets. The relative energy resolution ranges from $$(35 \pm 6)\%$$ ( 35 ± 6 ) % at $$p_{\text {T}} = 20$$ p T = 20 GeV to $$(6 \pm 0.5)\%$$ ( 6 ± 0.5 ) % at $$p_{\text {T}} = 300$$ p T = 300 GeV for central $$R=0.2$$

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