B →πη(′), η(′)η(′) decays and NLO contributions in the pQCD approach* |
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引用本文: | 张志清,刘新,肖振军.B →πη(′), η(′)η(′) decays and NLO contributions in the pQCD approach*[J].中国物理 C,2009,33(9):722-728. |
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作者姓名: | 张志清 刘新 肖振军 |
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作者单位: | Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210097, China |
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基金项目: | Supported by National Natural Science Foundation of China (10575052, 10735080) and Specialized Research Fund for Doctoral Program of Higher Education (SRFDP) (20050319008) |
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摘 要: | By employing the perturbative QCD (pQCD) factorization approach, we calculate the full leading and the partial next-to-leading order (NLO) contributions to the seven B →πη(′) and η(′)η(′) decays. For B^+→ π+η(′) decays, the pQCD predictions for their decay rates agree very well with the data after the inclusion of the small NLO contributions. For neutral decays, the pQCD predictions are also consistent with the experimental upper limits and can be tested by the LHC experiments. The measured value of dir .Acp^dir(π+η)= 19±7% can also be accommodated by the pQCD approach.
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关 键 词: | 微扰QCD 非线性光学 衰变率 实验测试 国际标准 LHC 测量值 分解 |
收稿时间: | 2009-1-9 |
修稿时间: | 2009-2-4 |
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