Direct top-quark decay width measurement in the t(t)over-bar lepton plus jets channel at root s=8 TeV with the ATLAS experiment

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Author
Aaboudd, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; Abreu, H; ...Date
2018-02-15Source Title
European Physical Journal C: Particles and FieldsPublisher
SPRINGERUniversity of Melbourne Author/s
Barberio, Luigia; Kubota, Takashi; Rados, Pere; Brennan, Amelia; Milesi, Marco; Urquijo, Phillip; Taylor, Geoffrey; Nuti, Francesco; Scutti, Federico; Ungaro, Francesca Consiglia; ...Affiliation
School of PhysicsMetadata
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Journal ArticleCitations
Aaboudd, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abidi, S. H., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adye, T., Affolder, A. A. ,... Zwalinski, L. (2018). Direct top-quark decay width measurement in the t(t)over-bar lepton plus jets channel at root s=8 TeV with the ATLAS experiment. EUROPEAN PHYSICAL JOURNAL C, 78 (2), https://doi.org/10.1140/epjc/s10052-018-5595-5.Access Status
Open AccessAbstract
This paper presents a direct measurement of the decay width of the top quark using
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
. 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,
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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