Off-shell Suppression of Renormalons in Non-relativistic QCD Boundstates
High Energy Physics - Phenomenology
2009-11-07 v3
Abstract
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.
Cite
@article{arxiv.hep-ph/0110277,
title = {Off-shell Suppression of Renormalons in Non-relativistic QCD Boundstates},
author = {Y. Kiyo and Y. Sumino},
journal= {arXiv preprint arXiv:hep-ph/0110277},
year = {2009}
}
Comments
Version to appear in Phys. Lett. B. 12 pages, 1 figure