Exploring the $t\bar{t}$ threshold at an electron-positron collider
High Energy Physics - Phenomenology
2026-03-19 v1
Abstract
Future electron-positron colliders offer a unique opportunity for high-precision measurements of the top-quark mass, width, strong coupling constant, and top-quark Yukawa coupling via a scan of the threshold. We present the first prospect study of the simultaneous determination of these parameters, incorporating the latest reference detector design for the Circular Electron-Positron Collider (CEPC). We find that the precision of the top-quark mass measurement can reach a few MeV excluding the theoretical uncertainty on the cross-section, which is nearly two orders of magnitude better than the high-luminosity LHC (HL-LHC) projections. The current theoretical uncertainty of the cross-section calculation is the limiting factor.
Cite
@article{arxiv.2603.17454,
title = {Exploring the $t\bar{t}$ threshold at an electron-positron collider},
author = {Leyan Li and Yuming Lin and Xiaohu Sun and Yajun Mao and Zhan Li and Kaili Zhang and Shudong Wang and Gang Li and Hongbo Liao and Yaquan Fang},
journal= {arXiv preprint arXiv:2603.17454},
year = {2026}
}