Perturbative QCD Potential and String Tension
Y. Sumino
Abstract
The leading non-perturbative contribution to the static QCD potential at r << 1/LambdaQCD is known to be O(r2) in operator-product expansion. It indicates that a "Coulomb+linear" potential at r <~ 1/LambdaQCD is included in the perturbative QCD prediction of the potential. It was shown that this is indeed the case, and the "Coulomb+linear" potential has been systematically computed up to next-to-next-to-leading logarithmic order, in terms of the Lambda parameter in the MSbar scheme (LambdaMSbar). We review the present status of the perturbative prediction for the QCD potential, which takes into account the theoretical breakthrough that took place around 1998.
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