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arXiv 0705.0704hep-ex
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用双味标记半轻子衰变模研究$D^0-{\bar D}^0$混合

Search for $D^0-{\bar D}^0$ Mixing Using Doubly Flavor Tagged Semileptonic Decay Modes

The BABAR Collaboration, B. Aubert

备注：
13 pages, 7 figures, submitted to Phys.Rev.D
发表信息：
Phys.Rev.D76:014018,2007
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摘要：

我们已经搜索了$D^0 - \bar{D}^0$混合在$D^{*+} \to π^+ D^0$衰变与$D^0 \to K^{(*)} e ν$在一个样本的$e^+ e^- \to {c\bar c}$事件产生近10.58 GeV。来自带电$D^*$衰变的慢π介子的电荷标记了产生时的粲味，并且要求其与在同一事件中完全重建的第二粲衰变的味一致。我们观察到3个混合候选人相比，2.85的背景事件，预计从模拟。我们将50%的系统不确定性归因于这一预期背景速率。我们发现一个中心值的混合率的$0.4 \times 10^{-4}$。使用频率论方法，我们分别在$(-5.6, 7.4) \times 10^{-4}$和$(-13, 12) \times 10^{-4}$设置相应的68%和90%置信区间。

英文摘要：

We have searched for $D^0 - \bar{D}^0$ mixing in $D^{*+} \to π^+ D^0$ decays with $D^0 \to K^{(*)} e ν$ in a sample of $e^+ e^- \to {c\bar c}$ events produced near 10.58 GeV. The charge of the slow pion from charged $D^*$ decay tags the charm flavor at production, and it is required to be consistent with the flavor of a fully reconstructed second charm decay in the same event. We observe 3 mixed candidates compared to 2.85 background events expected from simulation. We ascribe a 50% systematic uncertainty to this expected background rate. We find a central value for the mixing rate of $0.4 \times 10^{-4}$. Using a frequentist method, we set corresponding 68% and 90% confidence intervals at $(-5.6, 7.4) \times 10^{-4}$ and $(-13, 12) \times 10^{-4}$, respectively.

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