MicroBooNE中微子诱发的氩原子核质子敲出反应中的末态相互作用
Final-state interactions in neutrino-induced proton knockout from argon in MicroBooNE
AI总结：
本文系统比较了NEUT、NuWro、Achilles和INCL四种核内级联模型对中微子诱发单质子敲出过程的预测，发现其与DWIA光学势方法存在系统性差异，并指出MicroBooNE数据在低横向缺失动量区域被低估，可能与双体流干涉有关。
摘要：
中微子事件发生器利用核内级联模型（INC）来预测中微子-原子核相互作用中产生的强子的运动学。我们通过将同一组事件作为NEUT、NuWro、Achilles和INCL等INC的输入，对不同INC进行了一致性比较。这些输入对应于全微分单质子敲出截面的计算，采用扭曲波冲量近似（DWIA）或平面波冲量近似（PWIA），两者均包含现实的核空穴谱函数。我们将INC结果与采用光学势的DWIA计算结果进行比较，后者在（e,e'p）实验分析中被广泛使用。我们指出两种方法之间存在系统性差异。我们将INC结果应用于最近的MicroBooNE数据。我们评估了谱函数选择的影响，发现现实谱函数中的较大变化在现有数据下无法区分。数据被低估，在双核子敲出和共振产生贡献的区域缺少强度。然而，在横向缺失动量较低、单核子敲出占主导的区域，数据同样被低估。纳入与双体流的干涉可能会在该区域带来额外的强度。
英文摘要：
Neutrino event generators make use of intranuclear cascade models (INCs), to predict the kinematics of hadrons produced in neutrino-nucleus interactions. We perform a consistent comparison of different INCs, by using the same set of events as input to the NEUT, NuWro, Achilles and INCL INCs. The inputs correspond to calculations of the fully differential single-proton knockout cross section, either in the distorted-wave impulse approximation (DWIA) or plane-wave impulse approximation (PWIA), both including realistic nuclear hole spectral functions. We compare the INC results to DWIA calculations with an optical potential, used extensively in the analysis of (e,e'p) experiments. We point out a systematic discrepancy between both approaches. We apply the INC results to recent MicroBooNE data. We assess the influence of the choice of spectral function, finding that large variations in realistic spectral functions are indistinguishable with present data. The data is underpredicted, with strength missing in the region where two-nucleon knockout and resonance production contribute. However, the data is underpredicted also in regions of low transverse missing momentum, where one-nucleon knockout dominates. The inclusion of the interference with two-body currents could lead to additional strength in this region.
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