B→ Ds^(*)η(′) Decays in Perturbative QCD |
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引用本文: | 张志清.B→ Ds^(*)η(′) Decays in Perturbative QCD[J].理论物理通讯,2010(7):123-128. |
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作者姓名: | 张志清 |
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作者单位: | Department of Physics, Henan University of Technology, Zhengzhou 450001, China |
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基金项目: | Acknowledgments Z.Q. Zhang would like to thank C.D. Lu for fruitful discussions. |
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摘 要: | In this paper, we calculate the branching ratios for B^+→ Ds^+η, B^+→ Ds^+η′, B^+→ Ds^(→)η and B^+ → Ds^+η′ decays by employing the perturbative QCD (pQCD) factorization approach. Under the two kinds of η - η′ mixing schemes, the quark-flavor mixing scheme and the singlet-octet mixing scheme, we find that the calculated branching ratios agree well with the currently available experimental upper limits. We also consider the so called "fDs puzzle", by using two groups of parameters about the Ds^(→) meson decay constants, that are fDs = 241 MeV, fDs^→ = 272 MeV and fDs = 274 MeV, fDs^→ = 312 MeV, to calculate the branching ratios for the considered decays. We find that the results change 30%by using these two different kinds of paramters.
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关 键 词: | 微扰QCD 衰变常数 局长 文件描述符 衰变分支比 味混合 CP破坏 MeV |
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