Comprehensive study of dark matter beyond WIMP paradigm
Project/Area Number |
19J10946
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Research Category |
Grant-in-Aid for JSPS Fellows
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Allocation Type | Single-year Grants |
Section | 国内 |
Review Section |
Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
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Research Institution | Tohoku University |
Principal Investigator |
Ho ShuーYu 東北大学, 理学研究科, 特別研究員(DC2)
|
Project Period (FY) |
2019-04-25 – 2021-03-31
|
Project Status |
Completed (Fiscal Year 2020)
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Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2020: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2019: ¥1,000,000 (Direct Cost: ¥1,000,000)
|
Keywords | Axion-like particle / Sterile neutrino / MiniBooNE / hidden monopole / axion portal coupling |
Outline of Research at the Start |
1. To build a new model where the overproduced density of sterile neutrino is diluted, which can be achieved by using the out-of-equilibrium decay of the new particles. 2. To come up with a new mechanism to produce sterile neutrinos non-thermally and explain the recent observation of the unknown X-ray lines from nearby galaxies. 3. To see how the gravitational wave experiment LIGO limits on hidden photons.
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Outline of Annual Research Achievements |
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.
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Research Progress Status |
令和2年度が最終年度であるため、記入しない。
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Strategy for Future Research Activity |
令和2年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(11 results)