Threshold t(t)over-bar cross section at next-to-next-to-leading logarithmic order -: art. no. 014014

被引：62
|
作者：
Hoang, AH
Manohar, AV
Stewart, IW
Teubner, T
机构：
[1] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst Phys, D-80805 Munich, Germany
[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[3] Rhein Westfal TH Aachen, Inst Theoret Phys E, D-52056 Aachen, Germany
来源：
PHYSICAL REVIEW D | 2002年 / 65卷 / 01期
关键词：
D O I：
10.1103/PhysRevD.65.014014
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 a small residual dependence on the subtraction parameter nu. A detailed analysis of the residual v dependence is carried out. A conservative estimate for the remaining uncertainty in the normalization of the total cross section from QCD effects is deltasigma(t (t) over bar)/sigma(t (t) over bar)=+/-3%. This makes precise extractions of the strong coupling and top width feasible, and further studies of electroweak effects mandatory.
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页数：19
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