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题名: Implication of sin 2 beta from global fit and B -> J/psi K-s
作者: Wu, YL ;  Zhou, YF
刊名: INTERNATIONAL JOURNAL OF MODERN PHYSICS A
出版日期: 2001
卷号: 16, 期号:28, 页码:4547-4565
关键词: CP VIOLATION ;  2-HIGGS-DOUBLET MODEL ;  UNITARITY TRIANGLE ;  STANDARD MODEL ;  DECAYS ;  MATRIX ;  QUARK ;  CONSTRAINTS ;  PARAMETER ;  PHYSICS
学科分类: Physics
通讯作者: Wu, YL , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: The measurement of sin 2 beta is discussed within and beyond the standard model. In the presence of new physics, the angle beta extracted from the global fit (denoted by beta (SM)(fit)) and the one extracted from B --> J/psiK(S) (denoted by beta (J/psi)) are in general all different from the "true" angle beta which is the weak phase of CKM matrix element V-td*. Possible new physics effects on the ratio R-beta = sin 2 beta (J/psi)/sin2 beta (SM)(fit) is studied and parametrized in a t most general form. It is shown that the ratio R-beta may provide a useful tool in probing new physics. The experimental value of R-beta is obtained through an update of the global fit of the unitarity triangle with the latest data and found to be less than unity at la level. The new physics effects on R-beta from the models with minimum flavor violation (MFV) and the standard model with two-Higgs-doublet (S2HDM) are studied in detail. It is found that the MFV models seem to give a relative large value R-beta greater than or equal to 1. With the current data, this may indicate that this kind of new physics may be disfavored and alternative new physics with additional phases appears more relevant. As an illustration for models with additional phase beyond CKM phase, the S2HDM effects an R-beta are studied and found to be easily coincide with the data due to the flavor changing neutral Higgs interaction.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000172393000004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13645
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:
Wu, YL,Zhou, YF. Implication of sin 2 beta from global fit and B -> J/psi K-s[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2001,16(28):4547-4565.
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