  We argue that the appearance of the Landau pole in the running coupling of
QCD introduces 1/Q^2 power corrections in current correlation functions. These
terms are not accounted for by the standard operator product expansion and is
the price to be paid for the lack of a unique definition of the running
coupling at the 1/Q^2 level. We review also possible phenomenological
implications of the 1/Q^2 terms in an alternative language of the ultraviolet
renormalon.

High Energy Physics - Phenomenology