Calibration of the jet energy scale and resolution of small-radius jets using semileptonic $t\bar{t}$ events with the ATLAS detector

TL;DR

This paper presents a measurement of correction factors for jet energy scale and resolution in the ATLAS detector, using top quark events from proton-proton collisions at 13 TeV and 13.6 TeV, to improve jet calibration accuracy.

Contribution

It introduces a method to determine jet energy scale and resolution corrections using the forward-folding technique applied to top-quark decay events in ATLAS data.

Findings

Energy scale uncertainties range from 0.93% to 1.7%.

Resolution uncertainties range from 14% to 28%.

Correction factors vary with jet transverse momentum and pseudorapidity.

Abstract

A measurement of correction factors for the hadronic jet energy scale and resolution in the ATLAS detector is presented. These correction factors account for differences between simulated and observed data. They are obtained by analysing a selection of top quark events collected in proton-proton collisions by ATLAS between the years 2015 and 2018 at a centre-of-mass energy $\sqrt{s} = 13$ TeV as well as in 2022 and 2023 at $\sqrt{s} = 13.6$ TeV. The forward-folding technique is used to quantify the impact of different jet energy scale or resolution corrections on the reconstructed mass of the hadronically decaying $W$ boson from top-quark decays in simulation. The correction factors are extracted from a fit to the parameterised reconstructed $W$-boson mass distribution to data. The energy scale and resolution corrections are measured as a function of the jet transverse momentum between 20 GeV and 200 GeV and absolute pseudorapidity less than 0.8. The uncertainties in the energy scale range from about 0.93% to about 1.7% for jets between 35 and 200 GeV, while for the energy resolution the uncertainties range from about 14% to 28%. The method presented will be used in conjunction with other techniques to further improve ATLAS jet energy scale and resolution precision.