Probing the top-quark width through ratios of resonance contributions of e + e − → W + W − b b ¯ $$ {\mathrm{e}}^{+}{\mathrm{e}}^{-}\to {\mathrm{W}}^{+}{\mathrm{W}}^{-}\mathrm{b}\overline{\mathrm{b}} $$

Liebler, Stefan; Moortgat‐Pick, Gudrid; Papanastasiou, Andrew S.

doi:10.1007/jhep03(2016)099

Cited by 15 publications

(15 citation statements)

References 78 publications

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“…8, it still makes a large contribution around a CM energy of 500 GeV. While results including only electroweak corrections are shown in this report, more precise QCD corrections [18,43] must be included for future experimental analysis.…”

Section: Qcd Correctionmentioning

confidence: 82%

Beam polarization effects on top-pair production at the ILC

et al. 2018

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Full one-loop electroweak corrections for an e − e + → tt process associated with sequential t → bμν μ decay are discussed. At the one-loop level, the spinpolarization effects of the initial electron and positron beams are included in the total and differential cross sections. A narrow-width approximation is used to treat the top-quark production and decay while including full spin correlations between them. We observed that the radiative corrections due to the weak interaction have a large polarization dependence on both the total and the differential cross sections. Therefore, experimental observables that depend on angular distributions such as the forward-backward asymmetry of the top-production angle must be treated carefully including radiative corrections. We also observed that the energy distribution of bottom quarks is largely affected by the radiative corrections.

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Section: Qcd Correctionmentioning

confidence: 82%

Beam polarization effects on top-pair production at the ILC

et al. 2018

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“…It has recently been reevaluated in ref. [25], with the aim of extracting the top-quark width via ratios of single-to double-resonant signal regions.…”

Section: Jhep12(2016)075mentioning

confidence: 99%

“…The total cross section corresponding to the study of ref. [25], therein computed with Madgraph5 aMC@NLO [51], has been reproduced. Moreover, we find excellent agreement between Whizard, Sherpa [52] and Munich 4 for the parameter set given in section 5.1.…”

Section: Validationmentioning

confidence: 99%

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NLO QCD predictions for off-shell t t ¯ $$ t\overline{t} $$ and t t ¯ H $$ t\overline{t}H $$ production and decay at a linear collider

Nejad¹,

Kilian²,

Lindert

et al. 2016

J. High Energ. Phys.

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We present predictions for tt and ttH production and decay at future lepton colliders including non-resonant and interference contributions up to next-to-leading order (NLO) in perturbative QCD. The obtained precision predictions are necessary for a future precise determination of the top-quark Yukawa coupling, and allow for top-quark phenomenology in the continuum at an unprecedented level of accuracy. Simulations are performed with the automated NLO Monte-Carlo framework Whizard interfaced to the OpenLoops matrix element generator.

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“…The idea is motivated by recent proposals to measure the Higgs boson width from nonresonant production [16][17][18][19], which has interesting beyond the Standard Model (BSM) sensitivity [20][21][22][23][24][25][26][27] and 1 Similar ideas were recently discussed in Ref. [12][13][14]. The key difference with respect to this analysis are that these studies (I) were performed at parton-level only, (II) do not propose a physical observable for measuring the cross-section, and (III) do not extract any results with LHC data (and in the case of Ref.…”

Section: Introductionmentioning

confidence: 96%

Extracting the Top-Quark Width from Nonresonant Production

2019

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In the context of the Standard Model (SM) of particle physics, the relationship between the topquark mass and width (Γt) has been precisely calculated. However, the uncertainty from current direct measurements of the width is nearly 50%. A new approach for directly measuring the topquark width using events away from the resonance peak is presented. By using an orthogonal dataset to traditional top-quark width extractions, this new method may enable significant improvements in the experimental sensitivity in a method combination. Recasting a recent ATLAS differential cross section measurement, we find Γt = 1.28 ± 0.30 GeV (1.33 ± 0.29 GeV expected), providing the most precise direct measurement of the width.

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Probing the top-quark width through ratios of resonance contributions of e + e − → W + W − b b ¯ $$ {\mathrm{e}}^{+}{\mathrm{e}}^{-}\to {\mathrm{W}}^{+}{\mathrm{W}}^{-}\mathrm{b}\overline{\mathrm{b}} $$

Cited by 15 publications

References 78 publications

Beam polarization effects on top-pair production at the ILC

Beam polarization effects on top-pair production at the ILC

NLO QCD predictions for off-shell t t ¯ $$ t\overline{t} $$ and t t ¯ H $$ t\overline{t}H $$ production and decay at a linear collider

Extracting the Top-Quark Width from Nonresonant Production

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