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arXiv 1608.01595hep-exphysics.ins-det
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OPERA实验结果

Results from the OPERA experiment

Donato Di Ferdinando

摘要:

位于INFN Gran Sasso地下实验室的OPERA长基线实验旨在使用CNGS中微子束建立$ν_μ$ $\rightarrow$ $ν_τ$振荡的外观模式。在2008-2012年运行的数据样本中检测到5个$ν_τ$候选事件,预期背景为0.25个事件。如果显著性大于5 $σ$,则拒绝仅背景假设。在3+1中微子模型的框架下对τ中微子样品进行了分析。OPERA能够识别$ν_{e}$ CC事件,因为其目标具有良好的跟踪能力。电子中微子样品也被用来设定3+1振荡参数的限制。

英文摘要:

The OPERA long baseline experiment located in the INFN Gran Sasso underground Laboratory was designed to establish the $ν_μ$ $\rightarrow$ $ν_τ$ oscillations in appearance mode, using the CNGS neutrino beam. Five $ν_τ$ candidate events have been detected in a data sample from the 2008-2012 runs, with a expected background of 0.25 events. The background only hypothesis is rejected with a significance larger than 5$σ$. The analysis of the tau neutrino sample in the framework of the 3+1 neutrino model is presented. OPERA is able to identify $ν_{e}$ CC events due to the good tracking capabilities of its target. The electron neutrino sample is also used to set limits on the 3+1 oscillation parameters.

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