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arXiv 2205.01697hep-ph
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满射规范化流的事件生成和密度估计

Event Generation and Density Estimation with Surjective Normalizing Flows

Rob Verheyen

摘要:

规范化流是一类生成模型,可以进行精确的似然评估。虽然这些模型已经在粒子物理学中找到了各种应用,但归一化流不够灵活,无法模拟碰撞事件的许多外围特征。使用Nielsen et al.(2020)的框架,我们将几个满射和随机变换层引入基线归一化流,以改进排列对称性,不同维度和离散特征的建模,这些都是粒子物理事件中常见的。我们评估其效力的背景下生成的矩阵元素级的过程中,并在探测器级LHC事件的异常检测的背景下。

英文摘要:

Normalizing flows are a class of generative models that enable exact likelihood evaluation. While these models have already found various applications in particle physics, normalizing flows are not flexible enough to model many of the peripheral features of collision events. Using the framework of Nielsen et al. (2020), we introduce several surjective and stochastic transform layers to a baseline normalizing flow to improve modelling of permutation symmetry, varying dimensionality and discrete features, which are all commonly encountered in particle physics events. We assess their efficacy in the context of the generation of a matrix element-level process, and in the context of anomaly detection in detector-level LHC events.

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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