| Project/Area Number |
25247037
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
中野 健一 東京工業大学, 理学院, 助教 (20525779)
後藤 雄二 国立研究開発法人理化学研究所, その他, 研究員 (00360545)
宮地 義之 山形大学, 理学部, 准教授 (50334511)
澤田 真也 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (70311123)
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| Research Collaborator |
MIYASAKA SHYO 東京工業大学, 大学院理工学研究科, 大学院学生
NAGAI KEI 東京工業大学, 大学院理工学研究科, 大学院学生
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥44,200,000 (Direct Cost: ¥34,000,000、Indirect Cost: ¥10,200,000)
Fiscal Year 2016: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2015: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2014: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2013: ¥21,060,000 (Direct Cost: ¥16,200,000、Indirect Cost: ¥4,860,000)
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| Keywords | 反クォーク / フレーバー非対称性 / 陽子 / 海クォーク / ドレル・ヤン過程 / 陽子ビーム / フェルミ国立加速器研究所 / 陽子スピンのパズル / ドレル・ヤン反応 / フレーバー非対称度 / 陽子の構造 / パートン / 量子色力学 / グルーオン / 陽子のスピン構造 / 香りの対称性の破れ / スピン構造 |
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| Outline of Final Research Achievements |
We measured the flavor asymmetry of anti-quarks in the proton by Drell-Yan experiment SeaQuest at Fermi Accelerator Laboratory. We built a magnetic spectrometer and muon pair from Drell-Yan process was measured using the 120 GeV proton beam.
We were able to complete the data-taking of the experiment by the final year of this KAKENHI project. About 50% of the data were already analysed. The result was presented at international conferences. In all the measured region, the amount of anti-down quarks is larger than that of anti-up quarks, which gave further evidence for flavor asymmetry of the sea quarks.
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