用OPERA探测中微子与两顶点拓扑的相互作用
A neutrino interaction with two vertices topology detected by OPERA
摘要：
OPERA实验报告了在CNGS $ν_μ$束中检测到五个$ν_τ$候选物，允许在5.1 $σ$水平拒绝仅背景假设。除了这些事件，在$^{rd}$ 2011年5月23日，OPERA探测到一个“中性电流样”与两个次级顶点的相互作用。这种拓扑结构主要来自于$ν_τ$与相关的粲夸克产生的带电电流相互作用，或者来自于$ν_μ$与粲反粲对产生的中性电流相互作用。这些拓扑通常具有低概率。正在进行专门的多变量分析，以区分这两种假设。这里的事件拓扑结构进行了详细描述，并给出了所有可能的贡献的分类器的初步结果。
英文摘要：
The OPERA experiment has reported the detection of five $ν_τ$ candidates in the CNGS $ν_μ$ beam, allowing to reject the background-only hypothesis at the 5.1$σ$ level. Besides these events, on May 23$^{rd}$ 2011, OPERA detected a "neutral current like" interaction with two secondary vertices. Such topologies mainly arise from Charged Current interactions of a $ν_τ$ with associated charm quark production or from Neutral Current interactions of a $ν_μ$ with production of a charm anti-charm pair. These topologies have generally low probabilities. A dedicated multivariate analysis is in progress to allow discriminating between these two hypotheses. Here the event topology is described in detail and preliminary results of the classifiers for all possible contributions are given.
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。
