标题： B\to D_s^{(*)}π衰变在微扰QCD中 显示英文标题

标题： The B\to D_s^{(*)}πdecays in the perturbative QCD

摘要： 在本文中，我们计算在微扰QCD因子化方法中B^0\to D_s^+\pi ^-，B^+\to D_s^+\pi ^0，B^0\to D_s^{*+}\pi ^-和B^+\to D_s^{*+}\pi ^0衰变的分支比。 我们发现这四个衰变通道的计算分支比与测量值和当前实验上限相符。 在数值计算中，我们取矢量介子 D^{*}_s 的衰变常数和形状参数分别为 f_{D^{*}_s}=312 MeV 和 a_{D^{*}_s}=0.78，这些值比之前计算的要大。 显示英文摘要

摘要： In this paper, we calculate the branching ratios for B^0\to D_s^+\pi^-, B^+\to D_s^+\pi^0, B^0\to D_s^{*+}\pi^- and B^+\to D_s^{*+}\pi^0 decays in the perturbative QCD factorization approach. We find that the calculated branching ratios of these four decay channels agree well with the measured values and current experimental upper limit. In the numerical calculation, we take the decay constant and the shape parameter of the vector meson D^{*}_s as f_{D^{*}_s}=312 MeV and a_{D^{*}_s}=0.78 respectively, which are larger than those in the previous calculations.