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The correlator of vector heavy-quark currents at small q^2 is considered inthe large-beta_0 limit. The leading IR renormalon ambiguity of the sum of theperturbative series is canceled by the UV renormalon ambiguity of the gluoncondensate. Asymptotic behaviour of the perturbative series is obtained in amodel-independent way, up to a single unknown normalization factor.Gluon-virtuality distribution functions for the perturbative correction arecalculated.Comment: 8 pages, 3 figure

Correlator of heavy-quark currents at small q 2 in the large- $\beta_0$ limit