Global approximants with renormalization scale invariance in pQCD

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Truncated perturbative series (TPS's) of any observable have the unphysical dependence on the choice of the renormalization scale (RScl). The diagonal Padé approximants (dPA's) to any TPS of an observable possess the favorable property of being invariant in the laige-β0limit. This means that they are invariant under the change of the RScl μ2when the "running" coupling parameter αs(μ2) evolves according to the one-loop renormalization group equation. We present a method which generalizes this result - the resulting new approximants are fully RScl-invariant in the perturbative QCD (pQCD). Further, we present some numerical examples. Both the dPA"s and the new approximants are global, i.e., their structure goes beyond the usual (polynomial) TPS form and thus they could reveal some non-perturbative effects.
Original languageEnglish
Pages (from-to)333-336
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Publication statusPublished - 1 Jan 1999
Externally publishedYes

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