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Reexamining B ->pi pi, pi K decays in QCD factorization approach
Li, XQ; Yang, YD; Yang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China.
2005
发表期刊PHYSICAL REVIEW D
ISSN1550-7998
卷号72期号:7页码:-
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.
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
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
学科领域Physics
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收录类别SCI
WOS记录号WOS:000232936300028
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被引频次:38[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13744
专题理论物理所SCI论文
通讯作者Yang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China.
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Li, XQ,Yang, YD,Yang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China.. Reexamining B ->pi pi, pi K decays in QCD factorization approach[J]. PHYSICAL REVIEW D,2005,72(7):-.
APA Li, XQ,Yang, YD,&Yang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China..(2005).Reexamining B ->pi pi, pi K decays in QCD factorization approach.PHYSICAL REVIEW D,72(7),-.
MLA Li, XQ,et al."Reexamining B ->pi pi, pi K decays in QCD factorization approach".PHYSICAL REVIEW D 72.7(2005):-.
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