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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
Source PublicationPHYSICAL REVIEW D
KeywordCharmless B-decays Meson Form-factors To-leading Order Ckm Angle-gamma Penguin Contributions Branching Ratios Standard Model Strong Phases Cp Violation Heavy-quark
AbstractMotivated 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.
2005
ISSN1550-7998
Volume72Issue:7Pages:-
Subject AreaPhysics
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/13744
Collection理论物理所科研产出_SCI论文
Corresponding AuthorYang, YD , Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China.
Recommended Citation
GB/T 7714
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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