The top-antitop threshold at the ILC: NNLL QCD uncertainties

Autor(en)

André H. Hoang, Maximilian Stahlhofen

Abstrakt

We discuss the top-antitop production cross section near threshold at a future linear collider accounting for the NNLL QCD corrections to the anomalous dimension of the leading S-wave production current computed recently within renormalization-group-improved NRQCD perturbation theory. We argue that the still unknown soft NNLL mixing corrections are negligible so that the NNLL QCD corrections to the total cross section can be considered complete for practical purposes. Based on combined variations of the renormalization and matching scales and the overall size of the perturbative corrections we estimate that the NNLL QCD total cross section has a normalization uncertainty of dσ/σ = 5 % at threshold. We present results for the total cross section and also for the experimentally more relevant case, when moderate cuts are imposed on the reconstructed top and antitop invariant masses.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Deutsches Elektronen-Synchrotron DESY

Journal

Journal of High Energy Physics

Band

2014

Anzahl der Seiten

22

ISSN

1029-8479

Publikationsdatum

05-2014

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/bddd7945-d854-4e88-8d15-887ff6b5ae80