论文标题
分支分数的测量和在$ d^0 \ rightarrow k^0_s \，k^0_s \，π^+π^ - $在belle处搜索违反CP
Measurement of the branching fraction and search for CP violation in $D^0\rightarrow K^0_S\,K^0_S\,π^+π^-$ decays at Belle
论文作者
论文摘要
我们测量Cabibbo抑制的衰减的分支分数$ d^0 \ rightarrow k^0_s \，k^0_s \，π^+π^ - $，并通过测量$ cp $ symmetry $ a _ _ _ _ _ {\ rm cp} $以及$ t $ t $ t $ ddiple-add treftry trem trem trem trem treftiprry $ a^t _ {\ rm cp} $。我们使用Belle实验记录的数据的922 fb $^{ - 1} $，该$在kekb非对称能量$ e^+e^ - $ collider上运行。分支分数是相对于Cabibbo最佳归一化通道$ d^0 \ rightarrow k^0_s \，π^+π^ - $;结果为$ \ MATHCAL {B}（d^0 \ rightarrow k^0_s \，k^0_s \，π^+π^ - ）= [4.79 \ pm 0.08 \，（{\ rm Stat}} 10^{ - 4} $，其中第一个不确定性是统计的，第二个是系统的，而第三个是来自标准化通道中的不确定性。我们还测量$ a _ {\ rm cp} = [-2.51 \，\ pm 1.44 \，（{\ rm Stat}）\，^{+0.11} _ { - 0.10} \，（{\ rm syst}} 1.42 \，（{\ rm Stat}）\，^{+0.14} _ { - 0.12} \，（{\ rm syst}）] \％$。这些结果没有显示违反CP的证据。
We measure the branching fraction for the Cabibbo-suppressed decay $D^0\rightarrow K^0_S\,K^0_S\,π^+π^-$ and search for $CP$ violation via a measurement of the $CP$ asymmetry $A_{\rm CP}$ as well as the $T$-odd triple-product asymmetry $a^T_{\rm CP}$. We use 922 fb$^{-1}$ of data recorded by the Belle experiment, which ran at the KEKB asymmetric-energy $e^+e^-$ collider. The branching fraction is measured relative to the Cabibbo-favored normalization channel $D^0\rightarrow K^0_S\,π^+π^-$; the result is $\mathcal{B}(D^0\rightarrow K^0_S\,K^0_S\,π^+π^-) = [4.79 \pm 0.08\,({\rm stat}) \pm 0.10\,({\rm syst}) \pm 0.31\,({\rm norm})]\times 10^{-4}$, where the first uncertainty is statistical, the second is systematic, and the third is from uncertainty in the normalization channel. We also measure $A_{\rm CP} = [-2.51\,\pm 1.44\,({\rm stat})\,^{+0.11}_{-0.10}\,({\rm syst})]\%$, and $a^T_{\rm CP} = [-1.95\,\pm 1.42\,({\rm stat})\,^{+0.14}_{-0.12}\,({\rm syst})]\%$. These results show no evidence of CP violation.
