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Orbital motion of anti-quarks in the polarized proton studied by polarized Drell-Yan experiment at Fermilab

Research Project

Project/Area Number 18H03694
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionYamagata University

Principal Investigator

Miyachi Yoshiyuki  山形大学, 理学部, 教授 (50334511)

Co-Investigator(Kenkyū-buntansha) 後藤 雄二  国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 先任研究員 (00360545)
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)
中野 健一  東京工業大学, 理学院, 助教 (20525779)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥44,070,000 (Direct Cost: ¥33,900,000、Indirect Cost: ¥10,170,000)
Fiscal Year 2021: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2020: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Fiscal Year 2019: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Fiscal Year 2018: ¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Keywords陽子スピンの謎 / 反クォーク / 軌道回転運動 / 横偏極陽子標的 / 量子色力学 / ドレル・ヤン反応 / 核子構造 / 陽子スピン / ドレル・ヤン過程 / 偏極核子標的 / 軌道回転 / スピン / 軌道角運動量 / ドレルヤン過程 / 陽子構造 / 軌道運動 / 原子核物理学 / 陽子内部構造 / 反クォーク軌道運動 / スピン偏極陽子標的
Outline of Final Research Achievements

We have realized the SpinQuest experiment at the Fermi National Accelerator Laboratory in the United States, which involves a 120 GeV proton beam and a transversely polarized proton target, aiming to measure the target asymmetry in a polarized Drell-Yan cross-section. This experiment unveils the orbital motion of anti-quarks within the polarized protons, bringing us closer to resolving the long-standing question of the "origin of the proton spin" in Quantum Chromodynamics (QCD).
Despite the impact of the global COVID-19 pandemic, the measurement experiment initiation initially planned in 2019 did not materialize. However, we have completed the construction of the polarized proton target system and prepared the detector system, which measures the muon pair from the Drell-Yan reaction in anticipation of the forthcoming beam supply.

Academic Significance and Societal Importance of the Research Achievements

スピンといった陽子固有の性質が、陽子を構成するクォークおよびクォークを結びつけるグルーオンからどのように生まれるのか?という問いは、それらの相互作用を記述する量子色力学に対する根源的な問いである。一方で、その強結合的性質により明確な答えを阻んできた。本研究課題が目指す偏極陽子内での反クォークの軌道回転運動は、その問いに対する実測的解答に欠けている最後のピースをはめ、少なくとも陽子スピンを構成する各要素とその働きを実験的に明らかにするものである。新型コロナ感染症等の影響により測定には至らなかったものの、実験開始にむけた実験装置の準備を完了することができた。

Report

(5 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (35 results)

All 2023 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (11 results) Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (15 results) (of which Int'l Joint Research: 2 results) Remarks (4 results) Funded Workshop (1 results)

  • [Int'l Joint Research] Fermi National Accelerator Laboratory/University of Virginia/Los Alamos National Laboratory(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Aligarh Muslim University(インド)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] 山東大学/精華大学(中国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Yerevan Physics Institute(アルメニア)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Fermi National Accelerator Laboratory/University of Virginia/Los Alamos National Laboratory(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Shandong University/Tsinghua University(中国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Yerevan Physics Institute(アルメニア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Fermi National Accelerator Laboratory/University of Virginia/Los Alamos National Laboratory(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Shandong University(中国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Yerevan Physics Institute(アルメニア)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Fermi National Accelerator Laboratory/Los Alamos National Laboratory/Argonne National Laboratory(米国)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Measurement of J/ψ productions in p + d and p + p at SeaQuest2022

    • Author(s)
      K. Nakano
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 54 Pages: 60-60

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Recent progress of polarized Drell–Yan experiment at Fermilab,SpinQuest (E1039)2022

    • Author(s)
      K. Nagai
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 54 Pages: 59-59

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of nuclear effects on anti-quarks via Drell-Yan process at FNAL-SeaQuest2019

    • Author(s)
      K. Nakano et al.
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 53 Pages: 80-80

    • NAID

      130008157175

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Progress of the polarized Drell-Yan experiment at Fermilab, SpinQuest (E1039)2019

    • Author(s)
      Y. Miyachi et al.
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 53 Pages: 81-81

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 偏極ドレル・ヤン実験 Fermilab-SpinQuest2023

    • Author(s)
      中野健一
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] FNAL-SeaQuest 実験によるドレル-ヤン反応の p+d/p+p 断面積比の測定2022

    • Author(s)
      中野健一
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] SpinQuest実験の概要と偏極標的2022

    • Author(s)
      中野健一
    • Organizer
      第19回高エネルギーQCD・核子構造勉強会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Polarized Drell-Yan experiment at Fermilab, SpinQuest (E1039)2021

    • Author(s)
      Yoshiyuki Miyachi
    • Organizer
      the 24th International Spin Symposium (SPIN2021)
    • Related Report
      2020 Annual Research Report
  • [Presentation] 偏極ドレル・ヤン実験 Fermilab-SpinQuest2021

    • Author(s)
      宮地義之
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 偏極ドレル・ヤン実験 Fermilab-SpinQuest (E1039)2020

    • Author(s)
      宮地義之
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] FNAL-SeaQuest 実験によるドレル・ヤン反応を用いた核子内反クォーク分布と原子核効果の測定2019

    • Author(s)
      中野健一
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 偏極ドレル・ヤン実験 Fermilab-SpinQuest(E1039)2019

    • Author(s)
      宮地義之
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] FNAL-SeaQuest 実験によるドレル・ヤン反応を用いた反クォークに対する原子核効果の測定2019

    • Author(s)
      中野健一
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Measurement of polarized Drell-Yan process at FNAL E1039/SpinQuest2019

    • Author(s)
      中野健一
    • Organizer
      The 11th Circum-Pan-Pacific Symposium on High Energy Spin Physics
    • Related Report
      2019 Annual Research Report
  • [Presentation] Flavor asymmetry of quarks and antiquarks in the nucleon sea2019

    • Author(s)
      柴田利明
    • Organizer
      The 11th Circum-Pan-Pacific Symposium on High Energy Spin Physics
    • Related Report
      2019 Annual Research Report
  • [Presentation] 偏極ドレル・ヤン実験 Fermilab-E10392018

    • Author(s)
      宮地義之
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 陽子と中性子のクォーク・グルーオン構造  -スピンはどのように作られているか-2018

    • Author(s)
      柴田利明
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Measurements of parton structure of nucleons and nuclei via Drell-Yan process at Fermilab2018

    • Author(s)
      Kenichi Nakano
    • Organizer
      Fifth Joint Meeting of the Nuclear Physics Divisions of the APS and the JPS
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurement of proton induced Drell-Yan with the polarized nucleon targets at Fermilab-E10392018

    • Author(s)
      Yoshiyuki Miyachi
    • Organizer
      8th International Conference on Quarks and Nuclear Physics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Remarks] The SpinQuest/E1039 Experiment at Fermilab

    • URL

      https://spinquest.fnal.gov/

    • Related Report
      2021 Annual Research Report
  • [Remarks] Polarized SpinQuest

    • URL

      http://twist.phys.virginia.edu/E1039/

    • Related Report
      2021 Annual Research Report
  • [Remarks] Fermilab-SpinQuest実験

    • URL

      https://sites.google.com/quark.kj.yamagata-u.ac.jp/fermilab-spinquest/%E3%83%9B%E3%83%BC%E3%83%A0

    • Related Report
      2021 Annual Research Report 2019 Annual Research Report
  • [Remarks] Fermilab-SpinQuest実験

    • URL

      https://sites.google.com/quark.kj.yamagata-u.ac.jp/fermilab-spinquest/

    • Related Report
      2020 Annual Research Report
  • [Funded Workshop] International workshop on the structure of the proton2018

    • Related Report
      2018 Annual Research Report

URL: 

Published: 2018-04-23   Modified: 2024-01-30  

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