Measurement of Absolute Amount of Anti-Quarks in Proton at SeaQuest Experiment

• Project/Area Number: 25800133
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Nakano Kenichi 東京工業大学, 理工学研究科, 助教 (20525779)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2015: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2014: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 陽子 / 反クォーク分布 / フレーバー非対称性 / Drell-Yan反応 / Drell-Yan 反応 / SeaQuest 実験 / ビーム強度測定器

Outline of Final Research Achievements

The Drell-Yan process from proton+proton and proton+deuteron reactions was measured using proton beam and liquid hydrogen/deuterium targets at Fermilab in USA. It is aimed at deriving the asymmetry and the absolute amounts of anti-up and anti-down quarks in the proton. Physics data were accumulated in three data-taking periods from H25/11 to H28/07 (planned), and in the first period a detector for absolute beam intensity was developed and installed. The physics data were analyzed and a preliminary result of the asymmetry of anti-up and anti-down quarks was obtained.

Research Products

• [Int'l Joint Research] Abilene Christian Univ./Argonne National Lab/Fermi National Accelerator Lab(米国)
• [Int'l Joint Research] Academia Sinica/Ling-Tung Univ.(Taiwan)
• [Journal Article] Progress in probing flavor asymmetry of antiquarks in protons in the E906/SeaQuest experiment at Fermilab (2015)
  • Author(s): K. Nagai, Y. Goto, Y. Miyachi, S. Miyasaka, K. Nakano, S. Nara, S. Sawada and T.-A. Shibata
  • Journal Title: RIKEN Accel. Prog. Rep. Volume: 48 Pages: 123-123
  • Peer Reviewed / Open Access
• [Journal Article] FPGA-based trigger system for the Fermilab SeaQuest experiment (2015)
  • Author(s): Shiuan-Hal Shiu, Jinyuan Wu, Randall Evan McClellan, Ting-Hua Chang, Wen-Chen Chang, Yen-Chu Chen, Ron Gilman, Kenichi Nakano, Jen-Chieh Peng, Su-Yin Wang
  • Journal Title: Nucl. Instrum. Meth. Volume: A802 Pages: 82-88
  • DOI: 10.1016/j.nima.2015.09.001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] フェルミ研ドレル・ヤン実験 SeaQuest の現状 ─陽子内の反クォーク分布のフレーバー非対称性─ (2015)
  • Author(s): 中野健一, 澤田真也, 宮地義之
  • Journal Title: 高エネルギーニュース Volume: 34-2 Pages: 81-88
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Probing flavor asymmetry of antiquarks of the proton in the E906/SeaQuest experiment (2014)
  • Author(s): S. Miyasaka, Y. Goto, Y. Miyachi, K. Nagai, K. Nakano, S. Obata, F. Sanftl, S. Sawada and T.-A. Shibata
  • Journal Title: RIKEN Accel. Prog. Rep. Volume: 47 Pages: 97-97
  • Peer Reviewed / Open Access
• [Journal Article] Results of the commissioning run of E906/SeaQuest Drell-Yan experiment at the Fermilab (2013)
  • Author(s): S. Miyasaka, Y. Goto, Y. Kudo, Y. Miyachi, K. Nagai, K. Nakano, S. Obata, F. Sanftl, S. Sawada and T.-A. Shibata
  • Journal Title: RIKEN Accel. Prog. Rep. Volume: 46 Pages: 78-78
  • Peer Reviewed
• [Journal Article] Drift chamber construction for Drell-Yan measurement in SeaQuest experiment at Fermilab (2013)
  • Author(s): K.Nagai, S. Obata, Y. Kudo, S. Miyasaka, Y. Goto, Y. Miyachi, K. Nakano, F. Sanftl, S. Sawada and T.-A. Shibata
  • Journal Title: RIKEN Accel. Prog. Rep. Volume: 46 Pages: 206-206
  • Peer Reviewed
• [Presentation] TMD in Drell-Yan Experiments at Fermilab (2015)
  • Author(s): Kenichi Nakano
  • Organizer: The 10th Circum-Pan-Pacific Symposium on High Energy Spin Physics (PacSpin2015)
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 2015-10-08
  • Int'l Joint Research / Invited
• [Presentation] SeaQuest 実験の Drell-Yan 反応を用いた陽子内の sea クォークのフレーバー非対称度の研究 (2015)
  • Author(s): 宮坂翔, 後藤雄二, 眞田塁, 澤田真也, Florian Sanftl, 柴田利明, 永井慧, 中野健一, 奈良旬平, 宮地義之, 他 SeaQuest Collaboration
  • Organizer: 日本物理学会 第70回年次大会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2015-03-24
• [Presentation] Measurement of Boer-Mulders Function via Drell-Yan Process by SeaQuest Experiment at Fermilab (2014)
  • Author(s): K. Nakano for E906/SeaQuest Collaboration
  • Organizer: SPIN2014
  • Place of Presentation: 北京大学, 中国
  • Year and Date: 2014-10-24
• [Presentation] Status of Physics Run of Fermilab SeaQuest Experiment (2014)
  • Author(s): K. Nakano
  • Organizer: Meeting on High-energy hadron physics at J-PARC
  • Place of Presentation: KEK 東海キャンパス
• [Presentation] SeaQuest の本実験ビームタイムのスタートと実験の進行状況 I (2014)
  • Author(s): 永井慧, 小畑滋希, 後藤雄二, 澤田真也, Florian Sanftl, 柴田利明, 中野健一, 宮地義之, 他 SeaQuest Collaboration
  • Organizer: 日本物理学会 第69回年次大会
  • Place of Presentation: 東海大学 湘南キャンパス
• [Presentation] SeaQuest の本実験ビームタイムのスタートと実験の進行状況 II (2014)
  • Author(s): 宮坂翔, 小畑滋希, 後藤雄二, 澤田真也, Florian Sanftl, 柴田利明, 永井慧, 中野健一, 宮地義之, 他 SeaQuest Collaboration
  • Organizer: 日本物理学会 第69回年次大会
  • Place of Presentation: 東海大学 湘南キャンパス
• [Presentation] Experimental study with Drell-Yan process (2014)
  • Author(s): Kenichi Nakano
  • Organizer: 日本物理学会 第69回年次大会
  • Place of Presentation: 東海大学 湘南キャンパス
  • Invited
• [Presentation] フェルミ研 SeaQuest 実験のコミッショニング結果と今後の実験計画 (2013)
  • Author(s): 澤田真也, 小畑滋希, 後藤雄二, Florian Sanftl, 柴田利明, 永井慧, 中野健一, 宮坂翔, 宮地義之, 他 SeaQuest Collaboration
  • Organizer: 日本物理学会 2013年秋季大会
  • Place of Presentation: 高知大学 朝倉キャンパス
• [Remarks] 高エネルギー陽子・陽子反応におけるドレル・ヤン過程を用いた陽子内反クォークの研究
  • URL: http://www.nucl.phys.titech.ac.jp/e906/
• [Remarks] 高エネルギー陽子・陽子反応におけるドレル・ヤン過程を用いた陽子内反クォークの研究
  • URL: http://www.nucl.phys.titech.ac.jp/e906/