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26 April 2024
 
  » arxiv » hep-ph/0107144

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The Threshold t-tbar Cross Section at NNLL Order
A.H. Hoang ; A.V. Manohar ; I.W. Stewart ; T. Teubner ;
Date 13 Jul 2001
Journal Phys.Rev. D65 (2002) 014014
Subject hep-ph
AbstractThe 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 $lesssim pm 3%$. This makes precise extractions of the strong coupling and top width feasible, and further studies of electroweak effects mandatory.
Source arXiv, hep-ph/0107144
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