Comprehensive study of dark matter beyond WIMP paradigm

超越 WIMP 范式的暗物质综合研究

• 批准号: 19J10946
• 负责人: Ho ShuーYu
• 金额: $ 1.22万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-25 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19J10946/
• 关键词: Axion-like particle; Sterile neutrino; MiniBooNE; hidden monopole; axion portal coupling; Axion-like particle; Sterile neutrino; MiniBooNE; hidden monopole; axion portal coupling

In the second year of the JSPS research program, I am mainly interested in other applications of the axion-like particles (ALP). This September, I was invited by Prof. Chuan-Ren Chen at National Taiwan Normal University (NTNU) to have an academic visit. During this period, Prof. Chen wants to explain the MiniBooNE excess of electron-like events by using the ALP. The MiniBooNE is an experiment located at Fermilab. Recently, they have updated their results with increased data and new background analyses. In this project, we assume that the ALP only couples to an electron and a sterile neutrino. In a proper parameter region, our model can fit the MiniBooNE excess. Our strategy is as follows. First, the proton beam from the Fermilab booster hitting on a beryllium target, where a lot of mesons such as kaon and pion are produced. Through the mixing between the active neutrinos and sterile neutrino, the meson can decay into a charged lepton and a sterile neutrino, and the sterile neutrino would travel a few hundred meters and arrive at the MiniBooNE detector. Inside the detector region, the sterile neutrino would decay into an active neutrino and an ALP via the neutrino mixing, and the ALP would subsequently decay into an electron-positron pair that can mimic the electron-like events. The reason is that the MiniBooNE sensors cannot distinguish a collimated electron-positron pair from a single electron. For our idea to be valid, we also have to examine the parameter space we find is consistent with the observations such as bump-dump experiments and supernova explosions.

在JSPS研究计划的第二年，我主要对类似轴突的颗粒（ALP）的其他应用感兴趣。今年9月，台湾师范大学（NTNU）的Chuan-Ren Chen教授邀请我进行一次学术访问。在此期间，陈教授希望使用ALP来解释小型电子事件的过量。迷你蛋白是位于费米拉布（Fermilab）的实验。最近，他们通过增加数据和新的背景分析来更新结果。在这个项目中，我们假设ALP仅耦合到电子和无菌中微子。在适当的参数区域中，我们的模型可以符合小型酮过量。我们的策略如下。首先，来自费米拉布（Fermilab）助推器的质子束击中了铍靶标，在那里产生了许多介体，例如kaon和pion。通过活跃的中微子和无菌中微子之间的混合，介子可以腐烂成一个带电的Lepton和无菌中微子，而无菌中微子将行进几百米，并到达小型探测器。在检测器区域内，无菌中微子会通过中微子混合腐烂到活跃的中微子和ALP中，并且ALP随后会腐烂成一个可以模仿电子样事件的电子旋转对。原因是迷你酮传感器无法将准直的电子旋律对与单个电子区分开。为了使我们的想法有效，我们还必须检查我们发现的参数空间与观察结果一致，例如颠簸 - 雨普实验和超新星爆炸。