PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Top Quark and Electroweak Physics
Exclusive Top Threshold Matching at Lepton Colliders
J. Reuter,* B. Chokoufe Nejad, A. Hoang, W. Kilian, M. Stahlhofen, T. Teubner, C. Weiss
*corresponding author
Full text: pdf
Published on: August 02, 2019
Abstract
The threshold scan at future lepton colliders is the most precise known method to determine the top quark mass (well below 100 MeV), a fundamental parameter of the Standard Model that co-determines the
stability properties of the electroweak vacuum. We present a new method to match the continuum next-to-leading order QCD corrections with the next-to-leading logarithmic resummation of the Coulomb singularities of the quasi-toponium bound state at threshold where fixed-order perturbation theory is invalid. This matching is performed at the level of the fully exclusive WbWb final state. It allows to study all kinds of differential distributions at or close to threshold. The top mass dependence of these distributions opens up new possibilities for the top mass determination that might be competitive with the inclusive threshold scan.
DOI: https://doi.org/10.22323/1.340.0654
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