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题名: Reexamining B ->pi pi, pi K decays in QCD factorization approach
作者: Li, XQ ;  Yang, YD
刊名: PHYSICAL REVIEW D
出版日期: 2005
卷号: 72, 期号:7, 页码:-
关键词: CHARMLESS B-DECAYS ;  MESON FORM-FACTORS ;  TO-LEADING ORDER ;  CKM ANGLE-GAMMA ;  PENGUIN CONTRIBUTIONS ;  BRANCHING RATIOS ;  STANDARD MODEL ;  STRONG PHASES ;  CP VIOLATION ;  HEAVY-QUARK
学科分类: Physics
通讯作者: Yang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China.
部门归属: Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
英文摘要: Motivated by the recent experimental data, we have revisited the B ->pi K,pi pi decays in the framework of QCD factorization, with inclusion of the important strong penguin corrections of order alpha(s)(2) induced by b -> Dg(*)g(*) (D=d or s and g(*) denotes an off-shell gluon) transitions. We find that these higher order strong penguin contributions can provide similar to 30% enhancement to the penguin-dominated B ->pi K decay rates, and such an enhancement can improve the consistency between the theoretical predictions and the experimental data significantly, while for the tree-dominated B ->pi pi decays, these higher order contributions play only a minor role. When these strong penguin contributions are summed, only a small strong phase remains and the direct CP asymmetries get small corrections. We also find that patterns of the ratios between the CP-averaged branching fractions remain nearly unaffected even after including these higher order corrections and the pi K puzzle still persists. Our results may indicate that to resolve the puzzle one would have to resort to new physics contributions in the electroweak penguin sector as found by Buras et al.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000232936300028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13744
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Li, XQ,Yang, YD. Reexamining B ->pi pi, pi K decays in QCD factorization approach[J]. PHYSICAL REVIEW D,2005,72(7):-.
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