用相对论光学势对中微子散射的核内级联模型进行基准化
Benchmarking intra-nuclear cascade models for neutrino scattering with relativistic optical potentials
摘要：
在中微子实验中探索的大相空间中描述末态相互作用（FSI）是一个巨大的挑战。在中微子实验中，在半包容条件下操作，级联模型通常用于此任务，而在排他性条件下，FSI可以用相对论光学势（ROP）处理。我们制定的ROP方法和级联模型可以直接比较的条件下。我们饲料NEUT级联事件从一个相对论性的扭曲波脉冲近似计算，使用光学势的实部。削减所产生的事件的丢失的能量被应用于定义一组事件，可以直接比较RDWIA计算与全光学潜力。NEUT级联和ROP同意质子动能$T_p > 150$ MeV的碳，氧和钙原子核时，一个现实的核密度是用来引入事件的级联。对于$T_p < 100$ MeV，ROP和NEUT截面在形状上不同，并且幅度上的差异大于50%。单一的横向变量允许区分不同的方法FSI，但由于一个大的非QE的贡献，T2 K数据的比较并没有给出一个明确的观点FSI。我们讨论了电子散射，并认为，在丢失的能量FSI削减可以研究与最小的混杂因素，例如$e4ν$。T2 K条件下ROP和NEUT的一致性为这些模型作为足够大的核子动能的振荡分析工具提供了信心。当级联模型应用于小核子能量时，这些结果提醒我们要谨慎。大力鼓励对与该区域有关的模型假设进行评估。本文提供了新的限制级联模型的质子-核散射，可以很容易地应用到其他中微子事件发生器。
英文摘要：
The description of final-state interactions (FSI) in the large phase space probed in neutrino experiments poses a great challenge. In neutrino experiments, which operate under semi-inclusive conditions, cascade models are commonly used for this task, while under exclusive conditions FSI can be treated with relativistic optical potentials (ROP). We formulate conditions under which the ROP approach and cascade model can be directly compared. We feed the NEUT cascade with events from a relativistic distorted-wave impulse approximation calculation that uses the real part of an optical potential. Cuts on the missing energy of the resulting events are applied to define a set of events that can be directly compared to RDWIA calculations with the full optical potential. The NEUT cascade and ROP agree for proton kinetic energies $T_p > 150$ MeV for carbon, oxygen and calcium nuclei when a realistic nuclear density is used to introduce events in the cascade. For $T_p < 100$ MeV the ROP and NEUT cross sections differ in shape and differences in magnitude are larger than 50 \%. Single transverse variables allow to distinguish different approaches to FSI, but due to a large non-QE contribution the comparison to T2K data does not give an unambiguous view of FSI. We discuss electron scattering and argue that with a cut in missing energy FSI can be studied with minimal confounding factors in e.g. $e4ν$. The agreement of the ROP and NEUT for T2K conditions lends confidence to these models as a tool in oscillation analyses for sufficiently large nucleon kinetic energies. These results urge for caution when a cascade model is applied for small nucleon energies. The assessment of model assumptions relevant to this region are strongly encouraged. This paper provides novel constraints on cascade models from proton-nucleus scattering that can be easily applied to other neutrino event generators.
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