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题名: QCD approach to B -> D pi decays and CP violation
作者: Su Fang ;  Wu Yue-Liang ;  Yang Ya-Dong ;  Zhuang Ci
刊名: COMMUNICATIONS IN THEORETICAL PHYSICS
出版日期: 2008
卷号: 49, 期号:3, 页码:707-716
关键词: PRESERVING LOOP REGULARIZATION ;  LANDAU GAUGE QCD ;  INFRARED BEHAVIOR ;  SYMMETRY-BREAKING ;  WEAK DECAYS ;  B-MESONS ;  FACTORIZATION ;  RENORMALIZATION ;  AMPLITUDES ;  CHARMLESS
学科分类: Physics
通讯作者: Wu, YL , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China
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
英文摘要: 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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000254252700039
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5559
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
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.
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