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arXiv 1004.4772hep-ph
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微扰QCD中B \to D_s^{（*）}π衰变

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

Zhi-Qing Zhang

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10 pages, 2 figures
发表信息：
J.Phys.G36:125004,2009
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摘要：

本文用微扰QCD因子化方法计算了B ^0 \to D_s^+π^-，B^+ \to D_s^+π ^0，B ^0 \to D_s^{*+}π^-和B^+ \to D_s^{*+}π ^0衰变的分支比.我们发现这四个衰变道的分支比的计算值与测量值和目前的实验上限符合得很好。在数值计算中，我们取矢量介子D^{*}_s的衰变常数f_{D^{*}_s}=312 MeV，形状参数a_{D^{*}_s}=0.78，比以前的计算值都大。

英文摘要：

In this paper, we calculate the branching ratios for B^0\to D_s^+π^-, B^+\to D_s^+π^0, B^0\to D_s^{*+}π^- and B^+\to D_s^{*+}π^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.

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