OPERA实验：$ν_μ\longrightarrow ν_τ$振荡的直接搜索
The OPERA experiment: a direct search of the $ν_μ\longrightarrow ν_τ$ oscillations
摘要：
OPERA实验的目的是在CERN（CNGS）产生的准纯μ子中微子束中寻找τ中微子的出现。该探测器安装在距离CERN 730公里的Gran Sasso地下实验室，由铅/乳胶靶和电子探测器组成。在2007年进行了短暂的试点运行之后，2008年6月至11月进行了第一次物理运行。第二次物理运行于2009年6月开始。目前，CNGS总共（2008+2009年）向目标输送了4.2 10个$^{19}$质子，在OPERA探测器中产生了25，000多个时间符合事件。其中在探测器的目标上发生了约4000个事件。本文介绍了检测器和分析策略，并讨论了2008年和2009年运行的分析状况。
英文摘要：
The aim of the OPERA experiment is to search for the appearance of the tau neutrino in the quasi pure muon neutrino beam produced at CERN (CNGS). The detector, installed in the Gran Sasso underground laboratory 730 km away from CERN, consists of a lead/emulsion target complemented with electronic detectors. After a short pilot run in 2007, a first physics run took place from June to November 2008. The second physics run started in June 2009. At present a total (2008+2009) of 4.2 10$^{19}$ protons on target were delivered by the CNGS, producing more than 25,000 events in time coincidence in the OPERA detector. Among them \~4000 events occured in the target of the detector. In this paper the detector and the analysis strategy are described and the status of the analysis of the 2008 and 2009 runs is discussed.
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。
