The Top-Antitop Threshold at the ILC: NNLL QCD Uncertainties

Abstract

We discuss the top-antitop production cross section near threshold at a future linear collider accounting for the NNLL QCD corrections to the anomalous dimension of the leading S-wave production current computed recently within renormalization-group-improved NRQCD perturbation theory. We argue that the still unknown soft NNLL mixing corrections are negligible so that the NNLL QCD corrections to the total cross section can be considered complete for practical purposes. Based on combined variations of the renormalization and matching scales and the overall size of the perturbative corrections we estimate that the NNLL QCD total cross section has a normalization uncertainty of 5% at threshold. We present results for the total cross section and also for the experimentally more relevant case, when moderate cuts are imposed on the reconstructed top and antitop invariant masses.

23 pages, 7 figures; v2: plots and appendix added, journal version

References in corpus (8)

• Heavy Quark Pair Production near Threshold with Potential Non-Relativistic QCD
• Ultrasoft contribution to heavy-quark pair production near threshold
• Electroweak non-resonant NLO corrections to e+ e- -> W+ W- b bbar in the t tbar resonance region
• Renormalization Group Improved Bottom Mass from Upsilon Sum Rules at NNLL Order
• On Electroweak Matching Conditions for Top Pair Production at Threshold
• NNLO non-resonant corrections to threshold top-pair production from e+ e- collisions: Endpoint-singular terms
• Two-Loop Ultrasoft Running of the O(v^2) QCD Quark Potentials
• NNNLO results on top-quark pair production near threshold

Cited by in corpus (34)

• QCD and strongly coupled gauge theories: challenges and perspectives
• 50 Years of Quantum Chromodynamics
• Physics at the e+ e- Linear Collider
• Next-to-next-to-next-to-leading order QCD prediction for the top anti-top S-wave pair production cross section near threshold in e+ e- annihilation
• What is the Top Quark Mass?
• Top-Quark Physics at the CLIC Electron-Positron Linear Collider
• Determination of the top quark mass circa 2013: methods, subtleties, perspectives
• The MSR Mass and the $\mathcal{O}({\Lambda }_{\mathrm{QCD}})$ Renormalon Sum Rule
• Quantum tops at circular lepton colliders
• Non-resonant and electroweak NNLO correction to the $e^{+}{e}^{-}$ top anti-top threshold
• NLO QCD Predictions for off-shell $t\bar{t}$ and $t\bar{t}H$ Production and Decay at a Linear Collider
• Fully-differential Top-Pair Production at a Lepton Collider: From Threshold to Continuum
• Third-order correction to top-quark pair production near threshold I. Effective theory set-up and matching coefficients
• Top physics at high-energy lepton colliders
• Challenging exclusive top quark pair production at low and high luminosity LHC
• The QCD Static Energy using Optimal Renormalization and Asymptotic Padé-approximant Methods
• Heavy-quark pair production at lepton colliders at NNNLO in QCD
• Matching coefficients in NRQCD to two-loop accuracy
• Top quark mass measurement in radiative events at electron-positron colliders
• Top quark precision physics at the International Linear Collider
• Spin Correlations in $t\bar{t}$ Production and Decay at the LHC in QCD Perturbation Theory
• Top quark mass measurements at the $t\bar{t}$ threshold with CEPC
• Toponium: the smallest bound state and simplest hadron in quantum mechanics
• Automation of NLO processes and decays and POWHEG matching in WHIZARD
• NLO QCD corrections to off-shell top-antitop production with semi-leptonic decays at lepton colliders
• NNLO electron structure functions (PDFs) from SCET
• A detailed study on the prospects for a $\mathrm{t}\overline{\mathrm{t}}$ threshold scan in ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ collisions
• Physics at a Higgs Factory
• Non-relativistic high-energy physics: top production and dark matter annihilation
• WHIZARD 2.2 for Linear Colliders
• Renormalization group analysis of electromagnetic properties of the deuteron
• Electroweak radiative corrections to polarized top quark pair production
• Monte Carlo Event Generators for Future Lepton Colliders
• An optimal scheme for top quark mass measurement near $t\bar{t}$ threshold at future $e^{+}{e}^{-}$ colliders