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Su Fang; Wu Yue-Liang; Yang Ya-Dong; Zhuang Ci; Wu, YL , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China
QCD approach to B -> D pi decays and CP violation
Source PublicationCOMMUNICATIONS IN THEORETICAL PHYSICS
KeywordPreserving Loop Regularization Landau Gauge Qcd Infrared Behavior Symmetry-breaking Weak Decays B-mesons Factorization Renormalization Amplitudes Charmless
AbstractThe branching ratios and CP violations of the B -> D pi decays, including both the color-allowed and the color-suppressed modes, are investigated in detail within QCD framework by considering all diagrams that lead to three effective currents of two quarks. An intrinsic mass scale as a dynamical gluon mass is introduced to treat the infrared divergence caused by the soft collinear approximation in the endpoint regions, and the Cutkosky rule is adopted to deal with a physical-region singularity of the on mass-shell quark propagators. When the dynamical gluon mass mu(g) is regarded as a universal scale, it is extracted to be around mu(g) = 440 MeV from one of the well-measured B -> D pi decay modes. The resulting predictions for all branching ratios are in agreement with the current experimental measurements. As these decays have no penguin contributions, there are no direct CP asymmetries. Due to interference between the Cabibbo-suppressed and the Cabibbo-favored amplitudes, mixing-induced CP violations are predicted in the B -> D-+/-pi(-/+) decays to be consistent with the experimental data at 1-sigma level. More precise measurements will be helpful to extracting weak angle 2 beta + gamma.
2008
ISSN0253-6102
Volume49Issue:3Pages:707-716
Subject AreaPhysics
Indexed BySCI
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5559
Collection理论物理所科研产出_SCI论文
Corresponding AuthorWu, YL , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Su Fang,Wu Yue-Liang,Yang Ya-Dong,et al. QCD approach to B -> D pi decays and CP violation[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2008,49(3):707-716.
APA Su Fang,Wu Yue-Liang,Yang Ya-Dong,Zhuang Ci,&Wu, YL , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China.(2008).QCD approach to B -> D pi decays and CP violation.COMMUNICATIONS IN THEORETICAL PHYSICS,49(3),707-716.
MLA Su Fang,et al."QCD approach to B -> D pi decays and CP violation".COMMUNICATIONS IN THEORETICAL PHYSICS 49.3(2008):707-716.
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