Measurement of the top quark mass with the ATLAS detector

TL;DR

This paper reviews various measurements of the top quark mass by the ATLAS experiment at the LHC, utilizing different event signatures and methods, with the most precise result being 174.5 GeV.

Contribution

It provides a comprehensive overview of top quark mass measurements with multiple techniques and identifies the main sources of systematic uncertainties.

Findings

Most precise mass measurement: 174.5 GeV

Systematic uncertainties mainly from b-jet energy scale

Different event signatures used for measurement

Abstract

An overview is presented of the measurements of the top quark mass performed by the ATLAS experiment at the LHC with an integrated luminosity varying between 35 pb$^{-1}$ and 4.7 fb$^{-1}$. Different techniques are used to measure the top quark mass looking at events in all three signatures: fully-hadronic, lepton+jets and di-leptonic ones. The most precise measurement, using a template method on lepton+jets events, yields a top quark mass of 174.5 $\pm$ 0.6 (stat) $\pm$ 2.3 (syst) GeV. The dominant systematic uncertainties are related to the determination of the $b-$jet energy scale and the modelling of additional radiation accompanying the $t\bar{t}$ pair production.