Extended Nonlocal Chiral-Quark Model for the Heavy–Light Quark Systems

In this talk, we report the recent progress on constructing a phenomenological effective model for the heavy–light quark systems, which consist of (u, d, s, c, b) quarks, i.e. extended nonlocal chiral-quark model. We compute the heavy-meson weak-decay constants to verify the validity of the model. From the numerical results, it turns out that \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${( f_D, f_B, f_{D_s},f_{B_s}) = (207.54, 208.13, 262.56, 262.39)}$$\end{document} MeV. These values are in relatively good agreement with experimental data and various theoretical estimations.