Charmed particle analysis with one million neutrino interactions

CHORUS实验在核乳剂靶中存储了100万个相互作用的中微子。而过去的中微子振荡分析和粲数分析，如短寿命粒子探测，仅仅基于20万个事件。分析事件的局限性主要来自于扫描功率的限制和目标跟踪器预测精度的低效率。然后，本研究的目标是利用更快的扫描机定位100万个中微子事件，并处理大约2万个粲粒子相关事件。在10cmx10cm水平等大面积扫描中，对提高寻迹效率和减少背景轨迹进行了研究。对轨迹优度参数进行了调整，以保持信号背景电平和轨迹查找效率，并对事件定位进行了轨迹拾取。所有中微子事件的位置在CHORUS探测器和中微子事件与迷人粒子将被跟踪。

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.