论文标题
分支分数的计算和$ cp $违反$ b^ - \ rightarrow d_s^-d^0 $ decay
Calculation of branching fraction and $CP$ violation in $B^-\rightarrow D_s^-D^0$ decay
论文作者
论文摘要
LHCB合作报道了decay $ b^ - \ rightArrow d_s^-d^0 $中$ CP $不对称的最精确的测量值，其价值为$（-0.4 \ pm0.5 \ pm0.5）\％$。在这项研究中，在分解方法下计算了衰减中的$ cp $违规$ b^ - \ rightarrow d_s^-d^0 $。这种衰减模式包括电流树和企鹅图，其幅度被分别考虑。在每个树和企鹅振幅中，都引入了强和弱的相位。在这项工作中计算出的$ cp $不对称性为$（-0.35 \ pm0.03）\％$。最后，从振幅的总和中，我们计算了总幅度，并获得了可比结果，其分支比的实验值$ b^ - \ rightarrow d_s^-d-d^0 $衰减。
The most precise measurement of the $CP$ asymmetry in the decay $B^-\rightarrow D_s^-D^0$ has been reported by LHCb collaboration with the value of $(-0.4\pm0.5\pm0.5)\%$. In this study, the $CP$ violation in the decay $B^-\rightarrow D_s^-D^0$ has been calculated under the factorization approach. This decay mode includes current-current tree and penguin diagrams and their amplitudes are considered separately. In each of the tree and penguin amplitudes, the strong and weak phases have been introduced. The $CP$ asymmetry has been calculated in this work to be $(-0.35\pm0.03)\%$. Finally, from the sum of the amplitudes, we have calculated the total amplitude and obtained comparable results with experimental value for the branching ratio of $B^-\rightarrow D_s^-D^0$ decay.
