We present an update to the NNLL RG-improved QCD prediction of top-antitop production in electron-positron annihilation at threshold. It includes for the first time a complete NNLL resummation of ultrasoft logarithms, which are dominant at this order and give a sizable correction. The renormalization scale dependence of the total resonance cross section decreases substantially compared to earlier predictions, where the ultrasoft logarithms were included only partially.
@article{arxiv.1111.4486,
title = {NNLL top-antitop production at threshold},
author = {Andre Hoang and Maximilian Stahlhofen},
journal= {arXiv preprint arXiv:1111.4486},
year = {2011}
}
Comments
8 pages, 2 figures, to appear in the proceedings of RADCOR2011; footnote added, references corrected