论文标题
使用电子散射数据评估Genie事件发生器的准确性
Assessing the accuracy of the GENIE event generator with electron-scattering data
论文作者
论文摘要
未来的精确中微子振荡实验 - 沙丘是一个很好的例子---需要可靠的事件生成器工具。沙丘将运行的1--4 GEV能量制度的特征是从低能核物理领域过渡到扰动QCD，从而产生了丰富且高度复杂的物理学。鉴于这种复杂性，重要的是建立能够分解物理过程并单独测试的验证程序。在这里，我们通过对所有基于Fermilab的实验使用的Genie Generator进行基准测试来证明这种方法的实用性，以与广泛的包容性电子散发数据相对。该比较利用了一个事实，尽管电子核和中微子核过程共享许多常见的物理学，但电子散射使一个可以访问精确的束能量和散射运动学。探索以这种方式与Dune相关的运动学参数范围，我们观察到发生器和数据之间存在较大差异的模式。这些差异在产生Pion的制作方案中最突出，不仅存在于包括氩气的中型核中，而且还存在于氘和氢靶标中，表明hADRONIC PHACTORICS不予以编码。讨论了一些可能改进的方向。
Precision neutrino oscillation experiments of the future---of which DUNE is a prime example---require reliable event generator tools. The 1--4 GeV energy regime, in which DUNE will operate, is marked by the transition from the low-energy nuclear physics domain to that of perturbative QCD, resulting in rich and highly complex physics. Given this complexity, it is important to establish a validation procedure capable of disentangling the physical processes and testing each of them individually. Here, we demonstrate the utility of this approach by benchmarking the GENIE generator, currently used by all Fermilab-based experiments, against a broad set of inclusive electron-scattering data. This comparison takes advantage of the fact that, while electron-nucleus and neutrino-nucleus processes share a lot of common physics, electron scattering gives one access to precisely known beam energies and scattering kinematics. Exploring the kinematic parameter range relevant to DUNE in this manner, we observe patterns of large discrepancies between the generator and data. These discrepancies are most prominent in the pion-producing regimes and are present not only in medium-sized nuclei, including argon, but also in deuterium and hydrogen targets, indicating mismodeled hadronic physics. Several directions for possible improvement are discussed.
