The $D_sDK^*$ vertex in QCD Sum Rules: form factors and coupling constant

TL;DR

This paper uses QCD sum rules to analyze the $D_sDK^*$ meson vertex, calculating form factors and the coupling constant to deepen understanding of meson interactions.

Contribution

It provides a detailed calculation of the $D_sDK^*$ vertex form factors and coupling constant using QCD sum rules, considering different off-shell meson cases.

Findings

Coupling constant $g_{D_sDK^*} = 2.29^{+0.65}_{-0.41}$

Form factors fitted from correlation functions

Method applicable to other meson vertices

Abstract

In this work we study the meson vertex $D_sDK^*$ using the QCD sum rules. We compute the three point correlation functions for the three cases of different off-shell mesons. The form factors for each case are fitted to the numerical calculation of the correlation functions and the coupling constant of the vertex is obtained by comparing the form factors at their respective off-shell meson pole. The result obtained for the coupling constant is $g_{D_sDK^*} = 2.29^{+0.65}_{-0.41}$.