标题： B衰变中的CP破坏和CKM矩阵 显示英文标题

标题： CP Violation in B Decays and the CKM Matrix

摘要： BaBar和Belle实验对测量值$\sin 2\alpha$、$\sin 2\beta$和$\sin (2\beta + \gamma)$以及CKM矩阵元素$V_{cb}$和$V_{ub}$的结果进行了展示。 BaBar和Belle实验对$b \to sc\bar{c}$的测量结果与$\sin 2\beta$的结果相互一致，从而在B介子衰变中舒适地确立了CP破坏。 然而，这一结果与Belle实验通过$B^0 \to \phi K^0_S$衰变测得的$\sin 2\beta$之间存在3.5个标准偏差。Belle还通过衰变$B^0 \to \pi^+ \pi^-$的时间依赖性测量发现了CP破坏的证据，而BaBar则通过衰变$B^0 \to \rho^+\rho^-$的时间依赖性研究对单位角$\alpha$设定了更严格的限制。 显示英文摘要

摘要： Results by the BaBar and Belle experiments of the measurements $\sin 2\alpha$, $\sin 2\beta$ and $\sin (2\beta + \gamma)$ along with the CKM matrix elements $V_{cb}$ and $V_{ub}$ are presented. The BaBar and Belle experiments $b \to sc\bar{c}$ results for $\sin 2\beta$ are in good agreement with each other, comfortably establishing CP violation within B decays. However, there is a 3.5 standard deviation between this result and $\sin 2\beta$ measured by the Belle experiment using $B^0 \to \phi K^0_S$ decays. Belle also find evidence for CP violation through time dependent measurements of the decay $B^0 \to \pi^+ \pi^-$, whilst a tighter constraint has been placed on the unitarity angle $\alpha$ by BaBar, using time dependent studies of the decay $B^0 \to \rho^+\rho^-$ .