# Top quark mass measurement in the $\mathrm{t}\overline{\mathrm{t}}$ all-jets final state with the CMS experiment at $\sqrt{s}=13\,\mathrm{TeV}$

## TL;DR

This paper reports a precise measurement of the top quark mass using CMS data from 2016 in the all-jets final state, employing a kinematic fit and ideogram method to achieve high accuracy.

## Contribution

It introduces a novel measurement of the top quark mass in the all-jets final state with simultaneous jet energy scale constraint, improving precision over previous methods.

## Key findings

- Top quark mass measured as 172.34 GeV
- Achieved combined statistical and JSF uncertainty of 0.20 GeV
- Systematic uncertainty of 0.76 GeV

## Abstract

The top quark mass is measured using $35.9~\mathrm{fb}^{-1}$ of LHC proton-proton collision data collected with the CMS detector at $\sqrt{s}=13~\mathrm{TeV}$ in 2016. The measurement uses the $\mathrm{t}\overline{\mathrm{t}}$ all-jets final state, which comprises a total of six jets. A kinematic fit is performed to reconstruct the decay of the $\mathrm{t}\overline{\mathrm{t}}$ system and suppress QCD multijet background. By means of the ideogram method, the top quark mass is determined, simultaneously constraining an additional jet energy scale factor ($\text{JSF}$). The result of $172.34\pm0.20\,\text{(stat+JSF)}\pm0.76\,\text{(syst)}~\mathrm{GeV}$ for the top quark mass is in good agreement with previous measurements in the same and different final states.