We report the results for charge radii and decay constants of heavy–light D and B mesons in an improved QCD potential model. To enhance the effectiveness of short-range and long-range effect of the potential \(V(r)=-\frac{4 \alpha _\mathrm{s}}{3r}+\mathrm{br}\) in the perturbative procedure a cutoff parameter \(r^P\) is introduced as an integration limit. Another cutoff \(r_0\) is used for the polynomial approximation of the series expansion used in the Dalgarno’s method of perturbation. The results obtained are found to be in agreement with other available data. The limitation of the approach is discussed in the manuscript.

我们在改进的QCD势模型中报告了重光D和B介子的电荷半径和衰变常数的结果。为了增强的短距离的效力和潜在的远距离效果\（V（R）= - \压裂{4 \阿尔法_ \ mathrm {S}} {3R} + \ mathrm {BR} \）在摄动过程引入了截止参数\（r ^ P \）作为积分极限。另一个截断\（r_0 \）用于Dalgarno摄动方法中使用的级数展开式的多项式逼近。发现获得的结果与其他可用数据一致。该方法的局限性在手稿中讨论。