用模拟推断法重新估算中微子核反应参数,提升精度与泛化能力。
First Estimation of Model Parameters for Neutrino-Induced Nucleon Knockout Using Simulation-Based Inference
- 基于模拟推断技术,从实验数据反推中微子碰撞模型参数。
- 算法在微博恩实验数据上表现更优,参数偏差在误差范围内。
- 可适配不同模拟框架,具备跨模型迁移潜力。
为实现振荡参数的精确测量,加速器中微子实验需高保真度模拟吉电子伏特能区的核相互作用物理过程。尽管理论与实验界正大力提升模拟精度,当前仍常需通过经验调参。随着精度要求不断提高,机器学习或可应对未来模型调参的复杂性增长。本文重检了由微博恩合作组开发的GENIE中微子事件生成器的调参配置。尽管该配置能准确复现四个物理参数的截面预测值,但训练后的模拟推断(SBI)算法在面对微博恩原始实验数据时,偏好略有差异的参数值(仍在微博恩不确定性范围内),且拟合优度略高。此外,该算法还能对仅共享部分物理参数的另一模拟框架NuWro实现良好近似。
原文摘要 · Abstract (English)
To enable an accurate determination of oscillation parameters, accelerator-based neutrino experiments require detailed simulations of nuclear interaction physics in the GeV regime. While substantial effort from both theory and experiment is currently being invested to improve the fidelity of these simulations, their present deficiencies typically oblige experimental collaborations to resort to empirical tuning of simulation model parameters. As the precision requirements of the field continue to become more stringent, machine learning techniques may provide a powerful means of handling corresponding growth in the complexity of future neutrino interaction model tuning exercises. To study the suitability of simulation-based inference (SBI) for this physics application, in this paper we revisit a tuned configuration of the GENIE neutrino event generator that was originally developed by the MicroBooNE collaboration. Despite closely reproducing the adopted values of four physics parameters when confronted with the tuned cross-section predictions as input, we find that our trained SBI algorithm prefers modestly different values (within MicroBooNE's assigned uncertainties) and achieves slightly better goodness-of-fit when inference is run on the experimental data set originally used by MicroBooNE. We also find that our trained algorithm can create a fair approximation of an alternative neutrino scattering simulation, NuWro, that shares only a subset of its physics model parameters with GENIE.
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