标题： 暗物质实验时间有序数据处理的分析方法 显示英文标题

标题： An analysis method for time ordered data processing of Dark Matter experiments

摘要： 暗物质实验的时间有序数据的分析随着在研和即将进行的项目的灵敏度提高而变得越来越具挑战性。结合众所周知的本底事件水平，这导致数据中的叠加效应相当严重。电离、闪烁以及热电效应信号在其获取时间线上呈现出共同特征：低频基线、随机高斯噪声、寄生噪声以及由明确定义的峰值表征的信号。特别是对于像热电效应这样持续时间较长的信号，事件的叠加可能导致物理信号的重建不准确（误识别以及虚假事件）。我们提出了一种通用方法来检测和提取在高叠加率下的噪声数据中的信号，并表明从几千电子伏到几百千电子伏的事件可以在高叠加率的时间有序数据中被重构。该方法基于迭代检测与拟合过程，结合了数据的小波去噪处理和基线扣除。我们已在MACHe3原型实验的模拟数据上测试了此方法，并证明迭代拟合过程允许我们在存在从几千电子伏到几百千电子伏背景信号的情况下恢复最低能量的事件，大约为几千电子伏。最后，我们将此方法应用于最近的MACHe3数据，成功测量了来自Co57源的转换电子谱以及背景宇宙μ子谱。 显示英文摘要

摘要： The analysis of the time ordered data of Dark Matter experiments is becoming more and more challenging with the increase of sensitivity in the ongoing and forthcoming projects. Combined with the well-known level of background events, this leads to a rather high level of pile-up in the data. Ionization, scintillation as well as bolometric signals present common features in their acquisition timeline: low frequency baselines, random gaussian noise, parasitic noise and signal characterized by well-defined peaks. In particular, in the case of long-lasting signals such as bolometric ones, the pile-up of events may lead to an inaccurate reconstruction of the physical signal (misidentification as well as fake events). We present a general method to detect and extract signals in noisy data with a high pile-up rate and qe show that events from few keV to hundreds of keV can be reconstructed in time ordered data presenting a high pile-up rate. This method is based on an iterative detection and fitting procedure combined with prior wavelet-based denoising of the data and baseline subtraction. {We have tested this method on simulated data of the MACHe3 prototype experiment and shown that the iterative fitting procedure allows us to recover the lowest energy events, of the order of a few keV, in the presence of background signals from a few to hundreds of keV. Finally we applied this method to the recent MACHe3 data to successfully measure the spectrum of conversion electrons from Co57 source and also the spectrum of the background cosmic muons.