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Reexamining B ->pi pi, pi K decays in QCD factorization approach

文献类型:期刊论文

作者Yang, YD; Li, XQ; Yang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China.
刊名PHYSICAL REVIEW D
出版日期2005
卷号72期号:7页码:-
ISSN号1550-7998
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
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.
学科主题Physics
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WOS记录号WOS:000232936300028
公开日期2012-08-29
源URL[http://ir.itp.ac.cn/handle/311006/13744]  
专题理论物理研究所_理论物理所1978-2010年知识产出
通讯作者Yang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China.
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Yang, YD,Li, XQ,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 Yang, YD,Li, XQ,&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 Yang, YD,et al."Reexamining B ->pi pi, pi K decays in QCD factorization approach".PHYSICAL REVIEW D 72.7(2005):-.

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来源:理论物理研究所

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