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QCD approach to B -> D pi decays and CP violation
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
发表期刊COMMUNICATIONS IN THEORETICAL PHYSICS
ISSN0253-6102
卷号49期号:3页码:707-716
摘要The 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.
部门归属[Su, F; Wu, YL; Zhuang, C] Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China; [Su, F; Zhuang, C] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China; [Yang, YD] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China
关键词Preserving Loop Regularization Landau Gauge Qcd Infrared Behavior Symmetry-breaking Weak Decays B-mesons Factorization Renormalization Amplitudes Charmless
学科领域Physics
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收录类别SCI
WOS记录号WOS:000254252700039
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被引频次:4[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/311006/5559
专题理论物理所SCI论文
通讯作者Wu, YL , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China
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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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