论文标题
$ b_s \至k^0 \ bar k^0 $的分支分数：三个难题
The branching fraction of $B_s\to K^0\bar K^0$: Three puzzles
论文作者
论文摘要
LHCB和Belle实验最近测量了$ b_s \至k^0 \ b k^0 $衰减的分支分数。我们研究了测量值与来自标准模型的其他衰减率和CP不对称关系的三个关系的一致性，以及从近似风味$ su（3）$对称性相互作用的对称性。我们发现，这些关系中的每一个都以高于$3σ$的水平违反。我们认为，如果从理论上预期的要大，则各种统一的效果 - 撤销，静电企鹅和$ su（3）$ breaking-可以解释其中一些难题，但不能同时考虑所有这些难题。
The branching fraction of the $B_s\to K^0\bar K^0$ decay has been recently measured by the LHCb and Belle experiments. We study the consistency of the measured value with three relations to other decay rates and CP asymmetries which follow from the Standard Model, and from the approximate flavor $SU(3)$ symmetry of the strong interactions. We find that each of these relations is violated at a level of above $3σ$. We argue that various subleading effects -- rescattering, electroweak penguins and $SU(3)$ breaking -- if larger than theoretically expected, can account for some of these puzzles, but not for all of them simultaneously.
