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

TL;DR

This paper investigates how final-state interactions influence the strong coupling constant g_{D^* D b7 b7 b7} in D* decays, using light-cone QCD sum rules at large momentum transfers.

Contribution

It introduces a method to incorporate final-state interactions into the calculation of the strong coupling constant using light-cone QCD sum rules.

Findings

Final-state interactions significantly affect the value of g_{D^* D b7 b7 b7}.

Large momentum transfer assumption validates the operator product expansion.

The approach improves understanding of strong decay processes involving D mesons.

Abstract

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