arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.05374stat.MEastro-ph.IMphysics.data-anphysics.ins-detstat.AP
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在多层探测器中识别带电粒子的神经网络方法中处理缺失数据

Handling missing data in a neural network approach for the identification of charged particles in a multilayer detector

S. Riggi, D. Riggi, F. Riggi

摘要:

通过能量损失技术识别多层检测器中的带电粒子也可以通过使用神经网络来实现。当大部分信息丢失时,例如由于检测器效率低下,网络的性能变得更差。在过去几年中,已经开发出了提供估算缺失信息的方法的算法。在各种方法中,我们重点研究了正态混合模型,并与标准均值插补和多重插补方法进行了比较。此外,考虑到能量损失数据的内在不对称性,我们考虑了偏态-正态混合模型,并在期望最大化(EM)算法框架中提供了一个封闭形式的实现来处理丢失的模式。该方法已被应用到一个测试的情况下,在六层硅探测器的π介子,K介子和质子的能量损失被认为是一个神经网络的输入神经元。结果给出在重建效率和纯度的各种物种在不同的动量箱。

英文摘要:

Identification of charged particles in a multilayer detector by the energy loss technique may also be achieved by the use of a neural network. The performance of the network becomes worse when a large fraction of information is missing, for instance due to detector inefficiencies. Algorithms which provide a way to impute missing information have been developed over the past years. Among the various approaches, we focused on normal mixtures models in comparison with standard mean imputation and multiple imputation methods. Further, to account for the intrinsic asymmetry of the energy loss data, we considered skew-normal mixture models and provided a closed form implementation in the Expectation-Maximization (EM) algorithm framework to handle missing patterns. The method has been applied to a test case where the energy losses of pions, kaons and protons in a six-layers Silicon detector are considered as input neurons to a neural network. Results are given in terms of reconstruction efficiency and purity of the various species in different momentum bins.

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。

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