QCD Potential and ttbar Threshold Cross Section --- Status Report ---

Details QCD Potential and ttbar Threshold Cross Section --- Status Report --- QCD Potential and ttbar Threshold Cross Section --- Status Report ---

1998-01-27

arxiv.org/abs/hep-ph/9801419v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, LaTeX

Scientific paper

We include the full second-order corrections to the static QCD potential in the analysis of the ttbar threshold cross section. Then we examine the difference between the results obtained in the momentum-space approach and in the coordinate-space approach, which was found recently. Contrary to our expectation, the reduction of the difference by the inclusion of the second-order corrections is very small. There still remains a non-negligible deviation, which originates from the difference in the construction of the potentials in the two spaces. We scrutinize this problem. In particular, we estimate our present theoretical uncertainty of the ttbar threshold cross section at the peak to be at least 6% within perturbative QCD.

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