Abstract
This paper presents a direct measurement of the decay width of the top quark using 𝑡𝑡¯
t
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
−
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, Γ𝑡=1.76±0.33 (stat.) +0.79−0.68 (syst.) GeV
Γ
t
=
1.76
±
0.33
(
stat.
)
−
0.68
+
0.79
(
syst.
)
GeV
for a top-quark mass of 172.5 GeV, is consistent with the prediction of the Standard Model.
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