Correlator of heavy-quark currents at small q**2 in the large-beta(0) limit

The correlator of vector heavy-quark currents at small q^2 is considered in the large-beta_0 limit. The leading IR renormalon ambiguity of the sum of the perturbative series is canceled by the UV renormalon ambiguity of the gluon condensate. Asymptotic behaviour of the perturbative series is obtained in a model-independent way, up to a single unknown normalization factor. Gluon-virtuality distribution functions for the perturbative correction are calculated.

Note:

8 pages, 3 figures

quantum chromodynamics
heavy quark
current: vector
correlation function
infrared problem: renormalon
perturbation theory: higher-order
renormalization: renormalon
gluon: condensation
asymptotic behavior
gluon: momentum spectrum

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Figures(3)

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