Exclusive Top Threshold Matching at Lepton Colliders

Author(s)
Jürgen Reuter, Bijan Chokoufé Nejad, Andre Hoang, Wolfgang Kilian, Maximilian Stahlhofen, Thomas Teubner, Christian Weiss
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 W+bW−b¯ 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.

Organisation(s)
Particle Physics
External organisation(s)
Deutsches Elektronen-Synchrotron DESY, Universität Siegen, The University of Liverpool, Johannes Gutenberg-Universität Mainz
Journal
Proceedings of Science (PoS)
Volume
340
No. of pages
6
DOI
https://doi.org/10.22323/1.340.0654
Publication date
11-2018
Austrian Fields of Science 2012
103012 High energy physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/exclusive-top-threshold-matching-at-lepton-colliders(01afefd1-31b8-417a-95c9-22f436ee1e0a).html