A detailed study on the prospects for a tt- threshold scan in e+ e− collisions Defranchis, Matteo M. Blas Mateo, Jorge de Mehta, Ankita Selvaggi, Michele Vos, Marcel Top quark Electroweak Precision Physics Quark Masses A scan of the beam energy across the top quark pair (tt) 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 (mt), width (Γt), and Yukawa coupling (yt) at the electron-positron (e +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 mt and Γt can be determined with an experimental precision of 6.8 and 11.5 MeV, respectively, when mt 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 mt (Γt) at N3LO 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 e +e − collider. We also explore the prospects for a measurement of yt at FCC-ee via a dedicated run above the tt production threshold. 2025-11-17T11:07:40Z 2025-11-17T11:07:40Z 2025-11-05 journal article Defranchis, M.M., de Blas, J., Mehta, A. et al. A detailed study on the prospects for a tt threshold scan in e+ e− collisions. J. High Energ. Phys. 2025, 20 (2025). https://doi.org/10.1007/JHEP11(2025)020 https://hdl.handle.net/10481/108035 10.1007/JHEP11(2025)020 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer Nature