2023 Fiscal Year Final Research Report
Dynamics to bridge quark and hadron hierarchies
| Project Area | Clustering as a window on the hierarchical structure of quantum systems |
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| Project/Area Number |
18H05401
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hiroshima University |
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Principal Investigator |
Shigaki Kenta 広島大学, 先進理工系科学研究科(理), 教授 (70354743)
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| Co-Investigator(Kenkyū-buntansha) |
濱垣 秀樹 長崎総合科学大学, 新技術創成研究所, 特命教授 (90114610)
中條 達也 筑波大学, 数理物質系, 講師 (70418622)
郡司 卓 東京大学, 大学院理学系研究科(理学部), 准教授 (10451832)
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| Project Period (FY) |
2018-06-29 – 2023-03-31
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| Keywords | 高エネルギー原子核衝突 / パートン多体系 / ハドロン生成機構 |
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| Outline of Final Research Achievements |
We have promoted the ALICE experiment at the CERN LHC in Switzerland, leading its upgrade programs on the main tracker, the forward tracker, and the data acquisition system. A new stage of measurements was achieved to cover the wide kinematic range with improved precision and statistics in its third data taking period from 2022. The QGP phase with deconfined quarks and gluons is created via relativistic heavy ion collisions, and behaviors of few body systems of quarks and dynamics of hadronization have been investigated. The semi hierarchal clusters bridging the quark and hadron layers have been studied via characteristic rare phenomena in the extreme conditions, such as change of strongly coupled quark pair condensate, flavor dependence of interactions between quarks, and generation of new forms of hadrons.
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| Free Research Field |
高エネルギー原子核物理学
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| Academic Significance and Societal Importance of the Research Achievements |
スイスCERN研究所LHC加速器における大型国際共同実験研究ALICEにおいて、検出器高度化の主要部分を日本グループとして担い、従来にない精度と統計量を実現する新段階の測定を実現に導いた。高エネルギー原子核衝突ではクォークがハドロン中への閉込から解放され、ビッグバン直後の極初期宇宙を充した「クォーク・グルーオン・プラズマ」相を生成する。この極限状態の生成と通常状態への回帰に伴う多種の新奇現象により、クォークとハドロンという二つの階層の狭間に顕れる物理学を探究し、この微小世界に対して他の実験手法ではアクセスできない新たな知見を得た。
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