Analysis of zero Pion CC neutrino interactions in ANNIE

ANNIE 中零 Pion CC 中微子相互作用分析

• 批准号: 456139317
• 负责人: Professorin Dr. Caren Hagner
• 金额: --
• 依托单位: Institut für Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/456139317?language=en
• 关键词: Analysis; zero; Pion; CC; neutrino

The aim of the project is the analysis of the data of the ANNIE experiment with regard to the cross sections of neutrino interactions with charged currents without outgoing pions under consideration of neutron multiplicity. ANNIE is a water Cherenkov detector dopted with gadolinium in the Short Baseline Neutrino Beam at Fermilab. ANNIE's main task is to measure neutrino interactions from this beam, taking advantage of the fact that the gadolinium in the detector allows the number of neutrons produced per event to be determined very well. The cross sections obtained in this way will have a great influence on the energy determination in long-baseline neutrino experiments as well as on the background estimation in diffuse supernova neutrino background and proton decay experiments. Furthermore, they will help to understand which processes within the nuclei influence the number of outgoing pions, and how strongly individual processes, such as pion absorption and so-called 2-particle-2-hole processes, are involved. For this purpose, the measured rates have to be compared with predictions obtained by simulation using different generators. However, for most common neutrino generators this depends on some fine tuning in the software, which differs from experiment to experiment. This is not the case with GIBUU, a generator based on transport theory, which is why it is also to be integrated into ANNIE's simulation software.The proposed postdoc should take a leading role in these analyses and develop the complete analysis chain, starting with data selection, through prediction by simulation, to the calculation of the cross sections. Closely related to this is the use of the already mentioned generator GiBUU for ANNIE, whose predictions are to be used as a comparison. Depending on the speed with which these tasks can be completed, further investigations may follow. That means, that the potential that arises under certain scenarios will be investigated. The first scenario is the irradiation of ANNIE's with anti-neutrinos instead of neutrinos. For the second scenario, it is assumed that water-based liquid scintillator is used as the detector medium instead of water. And in the third scenario we will investigate to what extent it is worthwhile to use the temporal structure of the neutrino beam to break it down into parts with different compositions and energy spectra for analysis.

该项目的目的是在考虑中子多重性的情况下，分析安妮实验关于中微子与没有出射介子的带电电流相互作用截面的数据。安妮是费米实验室短基线中微子束中掺入Gd的水切伦科夫探测器。安妮的主要任务是测量来自该束流的中微子相互作用，利用探测器中的Gd可以很好地确定每个事件产生的中子数量。用这种方法得到的截面将对长基线中微子实验的能量确定以及扩散超新星中微子背景和质子衰变实验的本底估计产生很大的影响。此外，它们将有助于理解原子核内的哪些过程会影响出射介子的数量，以及个别过程，如pion吸收和所谓的2粒子2空穴过程，涉及的强度有多大。为此，必须将测量的速率与使用不同发电机模拟获得的预测进行比较。然而，对于大多数常见的中微子发生器来说，这取决于软件中的一些微调，这在不同的实验中是不同的。GIBUU是一个基于输运理论的生成器，但情况并非如此，这就是为什么它也将被集成到Annie的模拟软件中。拟议的博士后应该在这些分析中发挥主导作用，并开发完整的分析链，从数据选择开始，通过模拟预测，再到截面的计算。与此密切相关的是对安妮使用了已经提到的生成器GiBUU，其预测将被用作比较。根据完成这些任务的速度，可能会有进一步的调查。这意味着，在某些情况下出现的可能性将得到调查。第一种情况是用反中微子而不是中微子照射安妮的。对于第二种情况，假设使用水基液体闪烁体作为探测介质，而不是水。在第三种情况下，我们将研究利用中微子束的时间结构将其分解成具有不同成分和能谱的部分进行分析的价值。