QCD approach to B -> D pi decays and CP violation

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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
发表期刊	COMMUNICATIONS IN THEORETICAL PHYSICS
关键词	Preserving Loop Regularization Landau Gauge Qcd Infrared Behavior Symmetry-breaking Weak Decays B-mesons Factorization Renormalization Amplitudes Charmless
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.
	2008
ISSN	0253-6102
卷号	49 期号:3 页码:707-716
学科领域	Physics
收录类别	SCI
引用统计	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	理论物理所科研产出_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
推荐引用方式 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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