Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-07-04
Phys.Rev. D69 (2004) 125006
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 5 figures, elaborated conclusions
Scientific paper
10.1103/PhysRevD.69.125006
We examine the QCD perturbation series at large orders, for different values of the 'large $\beta_0$ renormalization scale'. It is found that if we let this scale grow exponentially with the order, the divergent series can be turned into an expansion that converges to the Borel integral, with a certain cut off. In the case of the first IR renormalon at $2/\beta_0$, corresponding to a dimension four operator in the operator product expansion, this qualitatively improves the perturbative predictions. Furthermore, our results allow us to establish formulations of the principle of minimal sensitivity and the fastest apparent convergence criterion that result in a convergent expansion.
Acoleyen Karel Van
Verschelde Henri
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