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

ATLAS Collaboration

Preprint/Report

PUBDB-2017-12057

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

ATLAS Collaboration (Collaboration author)DESY*

[10.3204/PUBDB-2017-12057]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2017-12057

Report No.: CERN-EP-2017-187; arXiv:1709.04207

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.

Classification:

ddc:530

Note: 44 pages in total, author list starting page 28, 6 figures, 3 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2017-02/

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