标题： 比较事件生成器预测和1 GeV下$ν$-$^{12}$C中性流准弹性散射的从头计算结果 显示英文标题

标题： Comparing event generator predictions and ab-initio calculations of $ν$-$^{12}$C neutral current quasi-elastic scattering at 1 GeV

摘要： 中微子振荡的测量和奇异物理现象的搜索是未来一段时间内物理学计划的重要组成部分，未来十年内将计划开展新的最先进的实验。 未来和现代这些领域的实验将使用核靶。 事件生成器（EGs）是在中微子振荡实验分析中使用的软件。 EGs 用于预测一系列中微子能量的运动学可观测值。 这些模拟可能缺乏更严格的理论计算所捕捉到的物理内容。 这项工作通过比较两种框架中生成的可观测值，将 EG 的性能与核理论计算进行比较。 我们提供理论和实验之间的一套共同定义，并评估 EG 模拟中包含的物理内容。 中微子和反中微子在$^{12}$C 靶上的中性流准弹性（NCQE）散射事件由一个特定的 EG，即 T2K 实验用于其分析的 NEUT 进行模拟。 模拟的截面与因子分解方案中的核理论解析计算进行比较。 我们将 NEUT 对核谱函数的两种不同模型的实现进行比较：相对论费米气体（RFG）和关联基谱函数（CBF），并与因子分解方案中相同模型的解析计算进行比较。 对于这两种核物理模型，我们比较与实验分析相关的分布中特征的出现情况。 定性地说，模拟分布的形状与通过理论计算得到的分布相似；然而，理论计算与 NEUT 模拟之间存在一些差异。 虽然 EG 模拟和使用相同核动力学模型的解析计算显示出相似的整体特征，但两者之间仍然存在差异。 显示英文摘要

摘要： The measurement of neutrino oscillations and exotic physics searches are important parts of the physics program in the near future, with new state-of-the-art experiments planned within the next decade. Future and modern experiments in these fields will make use of nuclear targets. Event Generators (EGs) are software used in the analysis of neutrino oscillation experiments. EGs use to predict kinematic observables for a range of neutrino energies. These simulations may lack physics captured by more rigorous theoretical calculations. This work compares EG performance to nuclear theory calculations by comparing observables generated in the two frameworks. We provide a common set of definitions between theory and experiment and assess the physics contained in EG simulations. Neutral current quasi-elastic (NCQE) scattering events for neutrinos and anti-neutrinos on a $^{12}$C target are simulated with a specific EG, NEUT, used by the T2K experiment for its analysis. The simulated cross sections are compared to analytic calculations from nuclear theory within the factorization scheme. We compare the NEUT implementation of two different models on nuclear spectral functions: the Relativistic Fermi Gas (RFG) and the correlated basis spectral function (CBF) to analytic calculations of the same models in the factorization scheme. For both nuclear physics models, we compare the appearance of features in the distributions relevant to experimental analyses. Qualitatively, the shape of the simulated distribution is similar to the one obtained through theory calculations; however, there are some discrepancies between the theory calculations and the NEUT simulation. While the EG simulations and analytic calculations with the same model of nuclear dynamics show similar overall features, there are still differences between the two.