Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-02-20
Phys.Rev. D58 (1998) 014006
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, LaTeX. Improved version of hep-ph/9801419 for submission to a journal
Scientific paper
10.1103/PhysRevD.58.014006
We include the full second-order corrections to the static QCD potential in the analysis of the ttbar threshold cross section. There is an unexpectedly large difference between the QCD potential improved by the renormalization-group equation in momentum space and the potential improved by the renormalization-group equation in coordinate space. This difference remains even at a fairly short distance 1/r \simeq 100 GeV and its origin can be understood within perturbative QCD. We scrutinize the theoretical uncertainties of the QCD potential in relation to the ttbar threshold cross section. In particular there exists a theoretical uncertainty which limits our present theoretical accuracy of the ttbar threshold cross section at the peak to be not better than 6% within perturbative QCD.
Jezabek Marek
Kuhn Johann H.
Peter Martine
Sumino Yoshio
Teubner Thomas
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