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In this article, we study the contribution from the final-state interactionsto the strong coupling constant $g_{D^* D \pi}$. We take an assumption that themomentum transfers in the strong decay $D^{*+} \to D^0 \pi^+$ be large tovalidate the operator product expansion in the light-cone QCD sum rules. Atlarge momentum transfers, the final-state interactions play an important role,and we should take them into account.

The strong coupling constant $g_{D^* D \pi}$ and final-state interactions