QCD NLO with Powheg matching and top threshold matching in WHIZARD

Reuter, Jürgen; Bach, Fabian; Chokoufe, Bijan; Kilian, Wolfgang; Stahlhofen, Maximilian; Weiß, Christian

doi:10.22323/1.235.0088

Cited by 3 publications

(3 citation statements)

References 46 publications

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“…A preliminary status thereof is presented in Ref. [56,57], while an in-depth study of the threshold matching in Whizard is in preparation [58]. In this paper, we focus on a fixed-order description of the continuum, while pointing out regions where threshold effects become important.…”

Section: Introductionmentioning

confidence: 99%

NLO QCD Predictions for off-shell $t \bar t$ and $t \bar t H$ Production and Decay at a Linear Collider

Nejad,

Kilian,

Lindert

et al. 2016

Preprint

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We present predictions for t t and t tH production and decay at future lepton colliders including non-resonant and interference contributions up to nextto-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 Open-Loops matrix element generator.

show abstract

Section: Introductionmentioning

confidence: 99%

NLO QCD Predictions for off-shell $t \bar t$ and $t \bar t H$ Production and Decay at a Linear Collider

Nejad,

Kilian,

Lindert

et al. 2016

Preprint

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“…These are implemented in the Monte Carlo generator Whizard [28], which can produce multi-particle process simulations at e + e − colliders. It includes a model "SM tt threshold.mdl " that can be used to calculate the top pair production cross section near the threshold at LL order and NLL order [29][30][31]. Because top quark pairs are unstable and decay to W + W − b b instantaneously when they are produced, the full process e + e − → W + W − b b should be taken into account, thus it has backgrounds which come from the decay of W + W − , ZZ and ZH etc.…”

Section: Cross Sectionmentioning

confidence: 99%

An optimal scheme for top quark mass measurement near the $\rm{t}\bar{t}$ threshold at future $\rm{e}^{+}{e}^{-}$ colliders

Chen¹,

Wan²,

Wang³

2018

Chinese Phys. C

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A simulation of top quark mass measurement scheme near the tt production threshold in future e + e − colliders, e.g. the Circular Electron Positron Collider(CEPC), is performed. χ 2 fitting method is adopted to determine the number of energy points to be taken and their locations. Our result shows that the optimal energy point is located near the largest slope of the cross section to beam energy and the most efficient scheme is to concentrate all luminosity on this single energy point in one parameter top mass fitting case. This suggests that the so called data driven method can be a best choice for the future real experimental measurement. Conveniently, the top mass statistical uncertainty can also be calculated directly by the error matrix even without any sampling and fitting. Agreement of the above two optimization methods has been checked. Our conclusion is that by taking 50 f b −1 total effective integrated luminosity data, the statistical uncertainty of the top potential subtracted mass can be suppressed to about 7 MeV and the total uncertainty is about 30 MeV. This precision will help to identify the stability of the electroweak vacuum at the Planck scale.

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“…A preliminary status thereof is presented in ref. [58,59], while an in-depth study of the threshold matching in Whizard is in preparation [60]. In this paper, we focus on a fixed-order description of the continuum, while pointing out regions where threshold effects become important.…”

Section: Jhep12(2016)075mentioning

confidence: 99%

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.

show abstract

QCD NLO with Powheg matching and top threshold matching in WHIZARD

Cited by 3 publications

References 46 publications

NLO QCD Predictions for off-shell $t \bar t$ and $t \bar t H$ Production and Decay at a Linear Collider

NLO QCD Predictions for off-shell $t \bar t$ and $t \bar t H$ Production and Decay at a Linear Collider

An optimal scheme for top quark mass measurement near the $\rm{t}\bar{t}$ threshold at future $\rm{e}^{+}{e}^{-}$ colliders

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

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