2022 Fiscal Year Final Research Report
Unified understanding of light hadron form factors using the first principle calculation of strong interaction
| Project/Area Number |
19H01892
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
佐々木 勝一 東北大学, 理学研究科, 准教授 (60332590)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 素粒子理論 |
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| Outline of Final Research Achievements |
We performed the large-scale lattice QCD simulation at the physical quark masses on the volume, where the physical spatial extent is more than 10 fm. Through the simulation, we obtained precise results of the form factor for light hadrons. The charge radius, which corresponds to the electric size of hadron, is determined from the form factors for pion and kaon. Those results agree with the experimental ones. Furthermore, the one of the quark mixing matrix elements, |Vus|, is precisely determined. This quantity is related to search for physics beyond the standard model. The uncertainty of our result is similar in size to the most accurate value of |Vus|. Moreover, various nucleon form factors are computed, and systematic uncertainties in the form factor calculations are investigated.
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| Free Research Field |
素粒子理論
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| Academic Significance and Societal Importance of the Research Achievements |
本課題で遂行した、現実世界と同じクォーク質量かつ一辺が10fmを超える巨大体積を用いた大規模格子QCDによる精密計算によって、軽い中間子の内部構造に密接に関係する物理量の実験値の再現に成功し、理論的に理解が難しい強い相互作用について、定量的理解を深めた。この成果は強い相互作用の非摂動論的総合理解として重要であるだけでなく、現在の素粒子物理分野で喫緊の課題である素粒子標準模型を超える物理現象の探索研究に対しても重要である。本課題では、この成果を基にして、素粒子標準模型を超える物理探索に関係した研究も実施した。
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