The Threshold t-tbar Cross Section at NNLL Order
A. H. Hoang, A. V. Manohar, I. W. Stewart, T. Teubner
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 3%. This makes precise extractions of the strong coupling and top width feasible, and further studies of electroweak effects mandatory.
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