Comprehensive study of dark matter beyond WIMP paradigm

超越 WIMP 范式的暗物质综合研究

基本信息

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

项目摘要

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，我主要对类轴子粒子（ALP）的其他应用感兴趣。今年9月，我应台湾师范大学陈传仁教授之邀来台进行学术访问。在此期间，陈教授想用ALP来解释MiniBooNE过量的类电子事件。 MiniBooNE 是位于费米实验室的一个实验。最近，他们用增加的数据和新的背景分析更新了结果。在这个项目中，我们假设 ALP 仅与电子和惰性中微子耦合。在适当的参数区域，我们的模型可以拟合 MiniBooNE 的多余部分。我们的策略如下。首先，费米实验室助推器发出的质子束击中铍靶，产生大量介子，例如介子和π介子。通过活性中微子和惰性中微子的混合，介子可以衰变为带电轻子和惰性中微子，惰性中微子将传播数百米到达MiniBooNE探测器。在探测器区域内，惰性中微子通过中微子混合衰变成活性中微子和 ALP，ALP 随后衰变成可以模拟类电子事件的电子-正电子对。原因是 MiniBooNE 传感器无法区分准直电子-正电子对和单个电子。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是否与凹凸转储实验和超新星爆炸等观察结果一致。