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An expansion scheme is developed for Feynman diagrams describing theproduction of one massive and one massless particle near the threshold. As anexample application, we compute the correlators of heavy-light quark currents,(\bar b gamma_mu u) and (\bar b gamma_5 u), through O(alpha_s^2).Comment: 4 pages, revtex

Threshold expansion for heavy-light systems and flavor off-diagonal current-current correlators