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arXiv 1208.6524hep-ex
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使用KLOE检测器搜索$ K_S to 3 π^0$衰变

Search for the $ K_S to 3 π^0$ decay with the KLOE detector

M. Silarski

摘要:

$K_S \to 3 π^0$衰变是一个纯粹的CP破坏过程,假设CPT不变性,允许人们调查直接的CP破坏。到目前为止还没有观察到这种衰变,分支比$BR(K_S to 3π^0) < 1.2 \cdot 10^{-7}$的最佳上限比基于标准模型的预测大两个数量级:$BR(K_S \to 3π^0) \sim 2 \cdot 10^{-9}$。在这篇文章中,我们提出了搜索的$K_S \to 3π^0$衰变进行的KLOE探测器在DAFNE Φ-工厂在弗拉斯卡蒂实验室。我们描述了用于背景抑制和信号事件选择的分析技术以及对$K_S \to 3π^0$分支比的几乎五倍下限上限的评估。我们还讨论了一个新的测量使用KLOE-2设备配备了一个新的内部跟踪器和量热计在低θ角的前景。

英文摘要:

The $K_S \to 3 π^0$ decay is a pure CP violating process which, assuming CPT invariance, allows one to investigate direct CP violation. This decay has not been observed so far, and the best upper limit on the branching ratio $BR(K_S to 3π^0) < 1.2 \cdot 10^{-7}$ is two orders of magnitude larger than predictions based on the Standard Model: $BR(K_S \to 3π^0) \sim 2 \cdot 10^{-9}$. In this article we present the search for the $K_S \to 3π^0$ decay performed with the KLOE detector operating at the DAFNE Φ-factory at the Frascati Laboratory. We describe the analysis techniques used in the background rejection and signal events selection as well as the evaluation of almost five times lower upper limit on the $K_S \to 3π^0$ branching ratio. We discuss shortly also the perspectives for a new measurement using the KLOE-2 apparatus equipped with a new inner tracker and the calorimeters at low theta angle.

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