The top-antitop threshold at the ILC: NNLL QCD uncertainties

Hoang, André H.; Stahlhofen, Maximilian

doi:10.1007/jhep05(2014)121

Cited by 48 publications

(67 citation statements)

References 55 publications

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“…The description of the threshold region used in this work is based on the renormalization-group-improved vNRQCD calculations of Refs. [16,24] which include (α s log v) m resummation and achieved NNLL (next-to-next-to-leading logarithmic) precision. The resulting QCD uncertainties are around 5% [16] and determine the theoretical uncertainties of our main numerical top mass analysis discussed in section V. The precision may be improved in future work through a combination with the N 3 LO fixed-order results of Ref.…”

Section: B Matched Cross Sectionmentioning

confidence: 99%

“…[16,24] which include (α s log v) m resummation and achieved NNLL (next-to-next-to-leading logarithmic) precision. The resulting QCD uncertainties are around 5% [16] and determine the theoretical uncertainties of our main numerical top mass analysis discussed in section V. The precision may be improved in future work through a combination with the N 3 LO fixed-order results of Ref. [25], but at this level also the ISR and vector-current approximations should be lifted by additional dedicated computations.…”

Section: B Matched Cross Sectionmentioning

confidence: 99%

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Top quark mass measurement in radiative events at electron-positron colliders

et al. 2020

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In this letter, we evaluate potential of linear e + e − colliders to measure the top quark mass in radiative events and in a suitable short-distance scheme. We present a calculation of the differential cross section for production of a top quark pair in association with an energetic photon from initial state radiation, as a function of the invariant mass of the tt system. This matched calculation includes the QCD enhancement of the cross section around the tt production threshold and remains valid in the continuum well above the threshold. The uncertainty in the top mass determination is evaluated in realistic operating scenarios for the Compact Linear Collider (CLIC) and the International Linear Collider (ILC), including the statistical uncertainty and the theoretical and experimental systematic uncertainties. With this method, the top quark mass can be determined with a precision of 110 MeV in the initial stage of CLIC, with 1 ab −1 at √ s = 380 GeV, and with a precision of approximately 150 MeV at the ILC, with L = 4 ab −1 at √ s = 500 GeV. Radiative events allow measurements of the top quark mass at different renormalization scales, and we demonstrate that such a measurement can yield a statistically significant test of the evolution of the MSR mass m MSR t (R) for scales R < mt.

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Section: B Matched Cross Sectionmentioning

confidence: 99%

Section: B Matched Cross Sectionmentioning

confidence: 99%

Top quark mass measurement in radiative events at electron-positron colliders

et al. 2020

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“…[55]. The state-of-the-art of fixed-order corrections has been recently improved to N 3 LO [56] and at the resummed level to NNLL [57]. However, these results are only accurate in the threshold region, while Whizard can describe both the threshold and continuum domain by using a smooth matching approach.…”

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.

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“…The alternative measurements, however, do not reach the precision of direct measurements. A determination of a running top-quark mass with a precision of about 100 MeV could be achieved at a future linear e + e − collider together with the strong coupling constant in a scan of the center-of-mass energy at the tt production threshold [77][78][79].…”

Section: The Top-quark Massmentioning

confidence: 99%

Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass

Kieseler¹

2016

Springer Theses

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In this thesis, measurements of the production cross sections for top-quark pairs and the determination of the top-quark mass are presented. Dileptonic decays of top-quark pairs (tt) with two opposite-charged lepton (electron and muon) candidates in the final state are considered. The studied data samples are collected in proton-proton collisions at the CERN Large Hadron Collider with the CMS detector and correspond to integrated luminosities of 5.0 fb −1 and 19.7 fb −1 at center-of-mass energies of √ s = 7 TeV and √ s = 8 TeV, respectively. The cross sections, σ tt , are measured in the fiducial detector volume (visible phase space), defined by the kinematics of the top-quark decay products, and are extrapolated to the full phase space. The visible cross sections are extracted in a simultaneous binned-likelihood fit to multi-differential distributions of final-state observables, categorized according to the multiplicity of jets associated to b quarks (b jets) and other jets in each event. The fit is performed with emphasis on a consistent treatment of correlations between systematic uncertainties and taking into account features of the tt event topology. By comparison with predictions from the Standard Model at nextto-next-to leading order (NNLO) accuracy, the top-quark pole mass, m pole t , is extracted from the measured cross sections for different state-of-the-art PDF sets.Furthermore, the top-quark mass parameter used in Monte-Carlo simulations, m MC t , is determined using the distribution of the invariant mass of a lepton candidate and the leading b jet in the event, m lb . Being defined by the kinematics of the top-quark decay, this observable is unaffected by the description of the top-quark production mechanism. Events are selected from the data collected at √ s = 8 TeV that contain at least two jets and one b jet in addition to the lepton candidate pair. A novel technique is presented, in which fixed-order calculations in quantum chromodynamics (QCD) are employed to determine the top-quark mass from the shape of the measured m lb distribution.The analysis is extended to a simultaneous fit of the tt production cross sections and m

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The top-antitop threshold at the ILC: NNLL QCD uncertainties

Cited by 48 publications

References 55 publications

Top quark mass measurement in radiative events at electron-positron colliders

Top quark mass measurement in radiative events at electron-positron 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

Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass

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