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Summation of the perturbation expansion and the QCD corrections to decay
Phys. Rev. D 43, R9(R) – Published 1 January, 1991
DOI: https://doi.org/10.1103/PhysRevD.43.R9
Abstract
The problem of summation of the perturbation expansion in QCD is discussed. It is argued that this expansion is summable by a modified Borel method. The QCD corrections to the semileptonic width of a heavy lepton are considered as an example. The possible differences between the predictions from the resummed expansion and the truncated expansion are illustrated. It is shown that the use of a Borel-type approximant may eliminate certain discrepancy between the theoretical prediction for the lepton and experiment.
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