Analysis of the vertices $DDV$ and $D^*DV$ with light-cone QCD sum rules

TL;DR

This paper uses light-cone QCD sum rules to analyze the vertices $DDV$ and $D^*DV$, providing updated estimates of the strong coupling constants relevant for hadronic B decay re-scattering effects.

Contribution

It offers new numerical evaluations of the strong coupling constants $g_{DDV}$ and $f_{D^*DV}$, which are smaller than previous estimates, enhancing understanding of hadronic B decays.

Findings

Numerical values of $g_{DDV}$ and $f_{D^*DV}$ are smaller than existing estimations.

The study clarifies the relation of these constants to parameters $eta$ and $\lambda$ in heavy quark effective theory.

Provides refined inputs for modeling final-state re-scattering in B decays.

Abstract

In this article, we study the vertices $DDV$ and $D^*DV$ with the light-cone QCD sum rules. The strong coupling constants $g_{DDV}$ and $f_{D^*DV}$ play an important role in understanding the final-state re-scattering effects in the hadronic B decays. They are related to the basic parameters $\beta$ and $\lambda$ respectively in the heavy quark effective Lagrangian, our numerical values are smaller than the existing estimations.