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arXiv 0707.2687hep-ex
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在DAFNE用KLOE探测器搜索K(S)--> e+e-衰变

Search for the K(S) --> e+e- decay with the KLOE detector at DAFNE

The KLOE collaboration

摘要:

我们目前的直接搜索结果的衰变KS --> e+e-与KLOE检测器,获得与样品的e+e-> phi --> KSKL事件产生在DAFNE,弗拉斯卡蒂phi工厂,为1.3fb-1的积分亮度。这种衰变的标准模型预测为BR(KS --> e+e-)= 1.6*10^-15。搜索已被标记的KS衰变的同时检测的KL相互作用的量热计。背景拒绝已被优化,同时使用运动学切割和粒子识别。在分析链的最后,我们发现在90% CL时BR(KS --> e+e-)< 2.1*10^-8,这比之前通过CPLEAR实验获得的最佳结果提高了约7倍。

英文摘要:

We present results of a direct search for the decay KS --> e+e- with the KLOE detector, obtained with a sample of e+e- --> phi --> KSKL events produced at DAFNE, the Frascati phi-factory, for an integrated luminosity of 1.3fb-1. The Standard Model prediction for this decay is BR(KS --> e+e-) = 1.6*10^-15. The search has been performed tagging the KS decays by simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kinematic cuts and particle identification. At the end of the analysis chain we find BR(KS --> e+e-) < 2.1*10^-8 at 90% CL, which improves by a factor of ~7 on the previous best result, obtained by CPLEAR experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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