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arXiv 2006.11944hep-phhep-exnucl-exnucl-th
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用电子散射数据评估GENIE事件generator的准确性

Assessing the accuracy of the GENIE event generator with electron-scattering data

Artur M. Ankowski, Alexander Friedland

摘要:

未来的精密中微子振荡实验-DUNE就是一个很好的例子-需要可靠的事件发生器工具。DUNE将在1- 4GeV的能量范围内运行,其特点是从低能核物理领域向微扰QCD领域过渡,从而产生丰富而高度复杂的物理学。考虑到这种复杂性,建立一个能够将物理过程分开并单独测试每个过程的验证程序是很重要的。在这里,我们展示了这种方法的效用基准GENIE发电机,目前使用的所有基于费米实验,对一组广泛的包容性电子散射数据。这种比较利用了这样一个事实,即虽然电子-核和中微子-核过程具有许多共同的物理特性,但电子散射使人们能够获得精确已知的束能量和散射运动学。以这种方式探索与DUNE相关的运动学参数范围,我们观察到生成器和数据之间存在较大差异的模式。这些差异在π介子产生机制中最为突出,不仅存在于中等大小的原子核(包括氩)中,而且存在于氘和氢靶中,这表明强子物理学模型错误。几个可能的改进方向进行了讨论。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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