Possible indications of new physics in B d -mixing and in sin (2 β) determinations
Possible indications of new physics in B d -mixing and in sin (2 β) determinations
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B d 混合和 sin (2 β) 测定中新物理学的可能迹象
DOI：
10.1016/j.physletb.2008.07.015
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发表时间：
2008
影响因子：
4.4
通讯作者：
A. Soni
中科院分区：
文献类型：
--
作者：
E. Lunghi;A. Soni
利用晶格中的强子矩阵元素bk和ξ，仅涉及与K-K¯，Bd-B¯和Bs-B¯smixing相关的Δflavor=2哈密顿量的4夸克算子，以及Vcb，我们推导出SM上的非平凡约束sin(2β)=0.87±0.09。这偏离了通过树过程的直接实验测量，b→cc¯s以及通过企鹅环b→s的衰减分别约为2.1和2.7σ。如果这些偏差得到证实，它们将意味着在Bd-B¯d中普遍存在新的物理现象。很可能发生在b→d)和b→s的转变中，这些转变需要超过SM - CP-odd相。因此，改进相关的晶格计算应给予高度优先。
Using the hadronic matrix elements from the lattice, BKand ξs, involving only the 4-quark operators for Δflavor=2 Hamiltonian relevant for K–K¯, Bd–B¯dand Bs–B¯smixing, along with Vcb, we deduce a non-trivial constraint on the SM, sin(2β)=0.87±0.09. This deviates from direct experimental measurements via the tree process, b→cc¯s as well as the one via the penguin-loop b→s decays by around 2.1 and 2.7σ respectively. If these deviations are confirmed they would imply the presence of new physics rather pervasively in both Bd–B¯d(i.e. very likely in b→d) as well as in b→s transitions requiring a beyond the SM CP-odd phase. Consequently, improvements in the relevant lattice calculations should be given a high priority.
DOI：
10.1016/j.nuclphysb.2003.09.026
发表时间：
2003-08
期刊：
Nuclear Physics
影响因子：
--
作者：
M. Beneke;M. Neubert
通讯作者：
M. Beneke;M. Neubert