# Top-quark mass measurement in the all-hadronic $t\bar{t}$ decay channel at $\sqrt{s}$ = 8 TeV with the ATLAS detector

## TL;DR

This paper measures the top-quark mass in the all-hadronic decay channel using 8 TeV proton-proton collision data from the ATLAS detector, employing a data-driven background model and template fitting techniques.

## Contribution

It presents a novel measurement of the top-quark mass in the all-hadronic channel with improved precision using a large data set and a data-driven background modeling approach.

## Key findings

- Top-quark mass measured as 173.72 GeV with combined uncertainty.
- Utilized a data-driven method for multi-jet background modeling.
- Achieved a precise top-quark mass measurement in the all-hadronic channel.

## Abstract

The top-quark mass is measured in the all-hadronic top-antitop quark decay channel using proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The data set used in the analysis corresponds to an integrated luminosity of 20.2 fb$^{-1}$. The large multi-jet background is modelled using a data-driven method. The top-quark mass is obtained from template fits to the ratio of the three-jet to the dijet mass. The three-jet mass is obtained from the three jets assigned to the top quark decay. From these three jets the dijet mass is obtained using the two jets assigned to the W boson decay. The top-quark mass is measured to be 173.72 $\pm$ 0.55 (stat.) $\pm$ 1.01 (syst.) GeV.