We established a method on measuring the $\dzdzb$ mixing parameter $y$ forBESIII experiment at the BEPCII $e^+e^-$ collider. In this method, the doublytagged $\psi(3770) \to D^0 \overline{D^0}$ events, with one $D$ decays toCP-eigenstates and the other $D$ decays semileptonically, are used toreconstruct the signals. Since this analysis requires good $e/\pi$ separation,a likelihood approach, which combines the $dE/dx$, time of flight and theelectromagnetic shower detectors information, is used for particleidentification. We estimate the sensitivity of the measurement of $y$ to be0.007 based on a $20fb^{-1}$ fully simulated MC sample.
展开▼
机译：我们建立了一种在BEPCII $ e ^ + e ^-$对撞机上测量BESIII实验的$ \ dzdzb $混合参数$ y $的方法。在这种方法中，使用双标签的$ \ psi（3770）\至D ^ 0 \ overline {D ^ 0} $事件，其中一个$ D $衰减到CP本征态，另一个$ D $半衰变地用来重构信号。由于此分析需要良好的$ e / \ pi $分离，因此将$ dE / dx $，飞行时间和电磁淋浴检测器信息相结合的似然法可用于粒子识别。根据完全模拟的$ 20fb ^ {-1} $ MC样本，我们估算$ y $的测量灵敏度为0.007。
展开▼
