Charmed particle analysis with one million neutrino interactions

合唱实验在核乳胶靶中存储了100万个中微子相互作用。而以往对中微子振荡的分析和魅力分析等针对短寿命粒子的探测仅仅是基于20万次事件。本研究的目的是利用较快的扫描机对100万个中微子事件进行定位，处理约2万个魅力粒子相关事件，在10cmx10 cm的大范围扫描水平上进行提高寻迹效率和减少背景轨迹的研究，并调整轨迹优度参数以保持信号背景水平和寻迹效率，并完成事件定位的轨迹拾取。跟踪所有中微子事件在合唱探测器中的定位和具有魅力粒子的中微子事件。

The CHORUS experiment stored one million neutrino interactions in nuclear emulsion target. While the past analysis for neutrino oscillation and charm analysis such for short life time particle detection was just based only 0.2 million events. The limitation of the analyzed event comes from limitation of scanning power and inefficiency due to target tracker prediction accuracy tail.Then the aim of this study is locating of 1 million neutrino events by faster scanning machine and deal about 20,000 charmed particle associated events.The R&D of improving track finding efficiency and reducing background tracks in the large area scanning like level of 10cmx10cm was done.And the parameters of track goodness are tuned to keep signal background level and track finding efficiency and the track pick up for event location was done.All neutrino event location in the CHORUS detector and neutrino events with charmed particle will be followed.