arXiv:2506.00119hep-phcs.LG2025-06被引 4

用数据驱动生成器提升物理异常检测,实现可解释的参数估计。

Generator Based Inference (GBI)

  • 用侧带数据学习背景生成器,替代传统模拟器
  • 在LHCO基准数据集上达到新最优异常检测灵敏度
  • 将异常检测结果转化为可解释的参数估计,适合高能物理研究

物理学中的统计推断常依赖于模拟实验数据的生成器(又称前向模型),其参数反映基础理论。现代机器学习极大提升了这一流程,使高维、未分箱分析得以利用更多数据信息。本文提出通用框架Generator Based Inference(GBI),整合机器学习与生成器。其中一种经典情形是基于仿真的推断(SBI),即使用物理仿真作为生成器。本文重点探讨数据驱动生成器的其他方法,尤其聚焦共振异常检测:通过侧带数据学习背景生成器,并在此基础上实现机器学习驱动的参数估计。该方法将异常检测的统计输出转化为可解释结果,在LHCO社区基准数据集上实现了新的状态最先进水平,显著提升异常检测灵敏度。

原文摘要 · Abstract (English)

Statistical inference in physics is often based on samples from a generator (sometimes referred to as a ``forward model") that emulate experimental data and depend on parameters of the underlying theory. Modern machine learning has supercharged this workflow to enable high-dimensional and unbinned analyses to utilize much more information than ever before. We propose a general framework for describing the integration of machine learning with generators called Generator Based Inference (GBI). A well-studied special case of this setup is Simulation Based Inference (SBI) where the generator is a physics-based simulator. In this work, we examine other methods within the GBI toolkit that use data-driven methods to build the generator. In particular, we focus on resonant anomaly detection, where the generator describing the background is learned from sidebands. We show how to perform machine learning-based parameter estimation in this context with data-derived generators. This transforms the statistical outputs of anomaly detection to be directly interpretable and the performance on the LHCO community benchmark dataset establishes a new state-of-the-art for anomaly detection sensitivity.

异常检测生成模型高能物理

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