Direct top-quark decay width measurement in the ttbar lepton+jets channel at sqrt(s) = 8TeV with the ATLAS experiment

Aaboud, M; Chiodini, G; Gorini, E; Primavera, M; Spagnolo, S; Ventura, A; and ATLAS Collaboration,

doi:10.1140/epjc/s10052-018-5595-5

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

Titolo:	Direct top-quark decay width measurement in the ttbar lepton+jets channel at sqrt(s) = 8TeV with the ATLAS experiment
Autori:	Aaboud, M CHIODINI, GABRIELE GORINI, Edoardo PRIMAVERA, Margherita SPAGNOLO, Stefania Antonia VENTURA, Andrea and ATLAS Collaboration mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2018
Rivista:	THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS
Abstract:	This paper presents a direct measurement of the decay width of the top quark using tt¯ 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, Γt=1.76±0.33 (stat.) +0.79−0.68 (syst.) GeV for a top-quark mass of 172.5 GeV, is consistent with the prediction of the Standard Model.
Handle:	http://hdl.handle.net/11587/419363
Appare nelle tipologie:	Articolo pubblicato su Rivista

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