Measurements of the top quark mass with the ATLAS detector

TL;DR

This paper reviews recent measurements of the top quark mass using ATLAS data from the LHC at 7 and 8 TeV, employing various methods including template fits and theoretical calculations to improve precision and scheme definition.

Contribution

It introduces novel measurements that utilize advanced QCD calculations to determine the top quark mass in a well-defined scheme, enhancing the accuracy of previous methods.

Findings

Precise top quark mass measurements in lepton+jets and dilepton channels.

Combination of different measurement techniques improves overall accuracy.

Use of theoretical QCD calculations to define the mass in the pole scheme.

Abstract

The top quark mass is one of the fundamental parameters of the Standard Model. In these proceedings, recent measurements of the top quark mass in $pp$ collisions at centre-of-mass energies of $\sqrt s=7$ and 8~TeV data in Run I of the Large Hadron Collider using the ATLAS detector are reviewed. A measurement using lepton+jets events is presented, where a multidimensional template fit is used to constrain the uncertainties on the energy measurements of jets. The measurement is combined with a measurement using dilepton events. In addition, novel measurements aiming to measure the mass in a well-defined scheme are presented. These measurements use precision theoretical QCD calculations for both inclusive $t\bar t$ production and $t\bar t$ production with an additional jet to extract the top quark mass in the pole mass scheme.