Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-10-22
Phys.Lett. B535 (2002) 145-154
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version to appear in Phys. Lett. B. 12 pages, 1 figure
Scientific paper
10.1016/S0370-2693(02)01731-8
We study an effect of the off-shellness of the quark and antiquark inside a heavy quarkonium system on IR renormalons contained in the perturbative computations of the quarkonium energy levels. We demonstrate that, when the off-shellness p_Q^2 -m_Q^2 \sim alpha_S^2 m_Q^2 is larger than m_Q Lambda_QCD, renormalons in the energy levels as calculated in perturbative QCD are suppressed by a factor Lambda_QCD/alpha_S^2 m_Q as compared to those in 2 m_pole + V_QCD(r). In this case the residual O(Lambda_QCD^4) renormalon has the same dimension as that of the leading gluon-condensate contribution.
Kiyo Yuichiro
Sumino Yoshio
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