The Threshold t-tbar Cross Section at NNLL Order
Abstract
The total cross section for top quark pair production close to threshold in e+e- annihilation is investigated. Details are given about the calculation at next-to-next-to-leading logarithmic order. The summation of logarithms leads to a convergent expansion for the normalization of the cross section, and small residual dependence on the subtraction parameter nu. A detailed analysis of the residual nu dependence is carried out. A conservative estimate for the remaining uncertainty in the normalization of the total cross section from QCD effects is . This makes precise extractions of the strong coupling and top width feasible, and further studies of electroweak effects mandatory.
Keywords
Cite
@article{arxiv.hep-ph/0107144,
title = {The Threshold t-tbar Cross Section at NNLL Order},
author = {A. H. Hoang and A. V. Manohar and I. W. Stewart and T. Teubner},
journal= {arXiv preprint arXiv:hep-ph/0107144},
year = {2008}
}
Comments
33 pages, 11 figs, a program to produce the cross section will be available soon