A detailed study on the prospects for a $\mathrm{t}\overline{\mathrm{t}}$ threshold scan in ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ collisions

Abstract

A scan of the beam energy across the top quark pair ($\mathrm{t}\overline{\mathrm{t}}$) production threshold is part of the program of future Higgs, top, and electroweak factory projects. In this paper, we provide projections for the achievable precision in the top quark mass ($m_{\mathrm{t}}$), width (${\Gamma }_{\mathrm{t}}$), and Yukawa coupling ($y_{\mathrm{t}}$) at the electron-positron (${\mathrm{e}}^{+}{\mathrm{e}}^{-}$) stage of the Future Circular Collider (FCC-ee). The study includes a detailed assessment of parametric and systematic uncertainties, as well as a rigorous estimate of the effect of point-to-point correlations. We project that $m_{\mathrm{t}}$ and ${\Gamma }_{\mathrm{t}}$ can be determined with an experimental precision of about 6.8 and 11.5 MeV, respectively, when $m_{\mathrm{t}}$ is defined in the potential-subtracted (PS) scheme. The impact of theoretical uncertainties due to missing higher orders is found to be of about 35 (25) MeV on $m_{\mathrm{t}}$ (${\Gamma }_{\mathrm{t}}$) at N${}^3$LO in non-relativistic QCD. Therefore, improvements in the theoretical accuracy, which is an active area of development, are key to match the achievable experimental precision at a future ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ collider. Finally, we explore the prospects for a measurement of $y_{\mathrm{t}}$ at FCC-ee via a dedicated run above the $\mathrm{t}\overline{\mathrm{t}}$ production threshold.

References in corpus (29)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• Quark mass relations to four-loop order
• Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future
• 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
• The CMS statistical analysis and combination tool: COMBINE
• Multi-parameter fits to the t-tbar threshold observables at a future e+e- linear collider
• Top quark mass measurements at and above threshold at CLIC
• Global analysis of electroweak data in the Standard Model
• Global and optimal probes for the top-quark effective field theory at future lepton colliders
• Top-quark electroweak couplings at the FCC-ee
• The Top-Antitop Threshold at the ILC: NNLL QCD Uncertainties
• Near-threshold production of heavy quarks with QQbar_threshold
• Non-resonant and electroweak NNLO correction to the $e^{+}{e}^{-}$ top anti-top threshold
• Jet Flavour Tagging for Future Colliders with Fast Simulation
• Higgs effects in top anti-top production near threshold in e+ e- annihilation
• Fully-differential Top-Pair Production at a Lepton Collider: From Threshold to Continuum
• Future Circular Collider Feasibility Study Report: Volume 1, Physics, Experiments, Detectors
• Luminosity Spectrum Reconstruction at Linear Colliders
• Analytic result for the top-quark width at next-to-next-to-leading order in QCD
• Heavy-quark pair production at lepton colliders at NNNLO in QCD
• Optimising top-quark threshold scan at CLIC using genetic algorithm
• Review of top quark mass measurements in CMS
• Reanalysis of the top-quark pair production via the $e^{+}{e}^{-}$ annihilation near the threshold region up to N${}^3$LO QCD corrections

Cited by in corpus (2)

• Monte Carlo Event Generators for Future Lepton Colliders
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