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High-precision calculation of the electron anomalous magnetic moment based on the quantum electrodynamics

Research Project

Project/Area Number 16K05338
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

NIO Makiko  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, 上級研究員 (80283927)

Project Period (FY) 2016-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords量子電磁気学 / 異常磁気能率 / 電子 / ミュオン / QED / 電子異常磁気能率 / 微細構造定数 / ミューオン / ファインマン図 / 数値積分 / 素粒子論 / 計算物理
Outline of Final Research Achievements

The g factor, which represents the magnitude of the magnetic moment of a single electron, is calculated based on the quantum electrodynamics (QED). The value of the electron g-2 represents fluctuations of the vacuum, and the prediction can be obtained with high precision by using the perturbation theory of QED.
The most important result of the project is that we performed the comparison of the tenth-order term we calculated before with the result of another group published in 2019; we have even confirmed that the difference between the two answers is a latent bias in the numerical integration calculation, but its correct value has not yet been determined. This will be the subject of future research.

Academic Significance and Societal Importance of the Research Achievements

現在の物理学では、物質のミクロでの究極の姿が素粒子である。そして素粒子間の相互作用により、観測される素粒子の性質が発現する。電子の持つ磁気の大きさを示すg因子もその一つだ。電子は、質量が最も軽い荷電レプトンであるため、電子g-2の精密測定が可能で、0.1ppbの精度で決定されており、さらに一桁以上の改良が計画されている。
本研究では、この電子g-2を理論で計算して同等以上の精度を達成しようとするものだ。摂動計算の高次項の確定には10年単位の時間がかかるが、検証の新手法を確立し実施したことで、摂動10次項の確定へと一歩近づいた。これにより、実験と理論の更なる高精度でのテストを実現に導いた。

Report

(8 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (18 results)

All 2021 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Open Access: 4 results,  Peer Reviewed: 3 results) Presentation (10 results) (of which Int'l Joint Research: 6 results,  Invited: 7 results)

  • [Int'l Joint Research] Cornell University(米国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Cornell University(米国)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Verification of the QED tenth-order electron g-2: Diagrams without a fermion loop2021

    • Author(s)
      Akira Hirayama and Makiko Nio
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 54 Pages: 66-66

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] The anomalous magnetic moment of the muon in the Standard Model2020

    • Author(s)
      T.Aoyama and et.al.
    • Journal Title

      Physics Reports

      Volume: 887 Pages: 1-166

    • DOI

      10.1016/j.physrep.2020.07.006

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 超精密計算による素粒子標準模型の向こう側 (特集 理論と計算の物理学 : 計算の背景にひそむ論理)2019

    • Author(s)
      仁尾 真紀子
    • Journal Title

      数理科学

      Volume: 58 Pages: 14-19

    • NAID

      40022155119

    • Related Report
      2019 Research-status Report
  • [Journal Article] Theory of the Anomalous Magnetic Moment of the Electron2019

    • Author(s)
      Aoyama Tatsumi、Kinoshita Toichiro、Nio Makiko
    • Journal Title

      Atoms

      Volume: 7 Issue: 1 Pages: 28-28

    • DOI

      10.3390/atoms7010028

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Revised and improved value of the QED tenth-order electron anomalous magnetic moment2018

    • Author(s)
      Aoyama Tatsumi、Kinoshita Toichiro、Nio Makiko
    • Journal Title

      Physical Review D

      Volume: 97 Issue: 3 Pages: 036001-036001

    • DOI

      10.1103/physrevd.97.036001

    • NAID

      120006457117

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Erratum: Tenth-order electron anomalous magnetic moment: Contribution of diagrams without closed lepton loops [Phys. Rev. D 91, 033006 (2015)]2017

    • Author(s)
      Aoyama Tatsumi、Hayakawa Masashi、Kinoshita Toichiro、Nio Makiko
    • Journal Title

      Physical Review D

      Volume: 96 Issue: 1 Pages: 011901-011901

    • DOI

      10.1103/physrevd.96.019901

    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 電子g-2のQED 5ループの寄与の確定に向けて2021

    • Author(s)
      平山陽 仁尾真紀子
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] QED calculations of the lepton g-22021

    • Author(s)
      Makiko Nio
    • Organizer
      joint workshop of the 13th International Workshop on Fundamental Physics Using Atoms and RCNP workshop Fundamental Physics Using Neutron and Atoms
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] レプトンg-2の物理研究と、その目指すもの2021

    • Author(s)
      仁尾 真紀子
    • Organizer
      第127回日本物理学会九州支部例会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 電子g-2のQED摂動10次計算の検証について2021

    • Author(s)
      平山 陽
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] On determination of the fine-structure constant: Electron g-2 and Atom Interferometers2020

    • Author(s)
      Makiko Nio
    • Organizer
      Muon g-2/EDM experiment at J-PARC, 21th Collaboration Meeting
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Higher-order QED contributions to the lepton anomalous magnetic moments2019

    • Author(s)
      Makiko Nio
    • Organizer
      Advanced Computing and Analysis Techniques in Physics Research (ACAT2019), Saas-Fee, Switzerland
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Higher-order QED corrections to the lepton g-22018

    • Author(s)
      Makiko Nio
    • Organizer
      Asian Linear Collider Workshop 2018, Fukuoka, Japan
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Higher-order QED corrections to the lepton g-22018

    • Author(s)
      Makiko Nio
    • Organizer
      SchwingerFest2018:g-2, Los Angeles, CA, USA
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] QED contributions to muon g-22017

    • Author(s)
      Makiko Nio
    • Organizer
      Workshop on hadronic vacuum polarization contributions to muon g-2
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Higher-order QED contributions to muon g-22016

    • Author(s)
      M. Nio
    • Organizer
      International workshop "Towards high precision muon g-2/EDM measurement at J-PARC"
    • Place of Presentation
      J-PARC, Tokai, Ibaraki, Japan
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2016-04-21   Modified: 2024-01-30  

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