Direct top-quark decay width measurement in the $t\bar{t}$ lepton+jets channel at $\sqrt{s}$=8 TeV with the ATLAS experiment

TL;DR

This paper reports a direct measurement of the top quark decay width using ATLAS data at 8 TeV, employing a template fit to kinematic distributions in $t\bar{t}$ events, resulting in a value consistent with the Standard Model.

Contribution

It introduces a novel direct measurement method of the top-quark decay width in the lepton+jets channel using ATLAS data at 8 TeV.

Findings

Measured top-quark decay width: 1.76 GeV with uncertainties.

Result consistent with Standard Model predictions.

Method utilizes template fits to kinematic observables.

Abstract

This paper presents a direct measurement of the decay width of the top quark using $t\bar{t}$ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton-proton collisions at a centre-of-mass energy of 8 TeV and corresponds to an integrated luminosity of 20.2 fb$^{-1}$. The decay width of the top quark is measured using a template fit to distributions of kinematic observables associated with the hadronically and semileptonically decaying top quarks. The result, $\Gamma_t = 1.76 \pm 0.33 (\rm{stat.}) ^{+0.79}_{-0.68} (\rm{syst.})\; \rm{GeV}$ for a top-quark mass of 172.5 GeV, is consistent with the prediction of the Standard Model.