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 |
URL标识 | 查看原文 |
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. |
推荐引用方式 GB/T 7714 | 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):-. |
入库方式: OAI收割
来源:理论物理研究所
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