Quest for new physics beyond the Standard Model by the muon-to-electron conversion

• Project/Area Number: 17J07754
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: 森津 学 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, 特別研究員(PD)
• Project Period (FY): 2017-04-26 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: ドリフトチェンバー / ガス検出器 / ミューオン / ミューオン・電子転換 / レプトンフレーバ非保存 / J-PARC

Outline of Annual Research Achievements

本年度はこれまで進めてきたCOMET実験に用いる円筒型ドリフトチェンバー（CDC）の性能評価試験の最終段階に到達した。まず昨年度導入した保護抵抗を実装済みのケーブル基板を全領域分用意し、全てのセンスワイヤーへの配線を完了した。トリガー回路やデータ収集システムの構築に際しては、昨年度確立させた基盤システムを拡張し、全4986チャンネルの読出し回路からのデータ収集を成功させた。オンラインイベントビルディングとサプレスモードを導入することでデータ量の削減にも寄与した。このように本年度ついにCDCの全領域の運転にこぎつけたことで本研究の重要な目標を達成した。
また、CDCのセットアップを開発のためのテストベンチとして提供するなど、多様なサブグループとの協奏の場を産みだし、国内外の共同研究者と協力しつつプロジェクトを主導してきた。解析においても本年度からは中国グループと協力し、COMET実験の公式フレームワークに基づいた新たなプラグラムを整備するなどソフトウェア開発にも注力してきた。これにより本実験を見据えたCDCのキャリブレーション手法の構築に寄与する。このようにハードウェア・ソフトウェア両面においてCDCの完全運転を実現したことは本研究における大きな成果である。
今年度は国際会議でCDCの開発とCOMET実験について３件の発表をおこなっており、国際的な場での成果発信も強く意識している。
本研究により来るべきCOMET実験第１期の物理測定における主要検出器であるCDCを完成させることができた。これによりCOMET実験の開始に向けて大きく前進した。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] COMET Phase-I Technical Design Report (2020)
  • Author(s): R. Abramishvili, M. Moritsu et al. [COMET Collaboration]
  • Journal Title: Prog. Theor. Exp. Phys. Volume: 2020 Issue: 3 Pages: 1-102
  • DOI: 10.1093/ptep/ptz125
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Radiation hardness study for the COMET Phase-I electronics (2020)
  • Author(s): Y. Nakazawa, M. Moritsu et al.
  • Journal Title: Nucl. Instrum. Meth. A Volume: 955 Pages: 163247-163247
  • DOI: 10.1016/j.nima.2019.163247
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Status of the COMET Experiment (2019)
  • Author(s): Moritsu Manabu
  • Journal Title: Proceedings of Science Volume: 341 Pages: 142-142
  • DOI: 10.22323/1.341.0142
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Construction and performance tests of the COMET CDC (2019)
  • Author(s): Moritsu Manabu、KUNO YOSHITAKA、Matsuda Yugo、Nakazawa Yu、Okinak Kaori、Sakamoto Hideyuki、Sato Akira、Wong Ming Liang、Wong TingSam、Wu Chen、Yamane Takahito、Yoshida Hisataka、Li Hai-bo、Xiaoshan Jiang、Zhang Jie
  • Journal Title: Proceedings of Science (ICHEP2018) Volume: 340 Pages: 538-538
  • DOI: 10.22323/1.340.0538
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Extinction Measurement of J-PARC MR with 8 GeV Proton Beam for the New Muon-to-Electron Conversion Search Experiment - COMET (2019)
  • Author(s): H. Nishiguchi, M. Moritsu et al.
  • Journal Title: Proc. of 10th Int. Particle Accelerator Conf. (IPAC2019) Volume: - Pages: 4372-4375
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 8 Gev Slow Extraction Beam Test for Muon to Electron Conversion Search Experiment at J-PARC (2019)
  • Author(s): M. Tomizawa, M. Moritsu et al.
  • Journal Title: Proc. of 10th Int. Particle Accelerator Conf. (IPAC2019) Volume: - Pages: 2322-2325
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Status of the COMET experiment (2019)
  • Author(s): M. Moritsu
  • Journal Title: PoS NuFACT2018 (掲載決定済) Volume: - Pages: 142-142
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Construction and performance tests of the COMET CDC (2019)
  • Author(s): M. Moritsu et al.
  • Journal Title: PoS ICHEP2018 (掲載決定済) Volume: - Pages: 538-538
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Observation of a Be double hypernucleus in the J-PARC E07 experiment (2019)
  • Author(s): H.Ekawa, S.Hasegawa, K.Imai et al.,
  • Journal Title: Progress of Theoretical and Experimental Physics. Volume: 2019-2 Issue: 2
  • DOI: 10.1093/ptep/pty149
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Missing-mass spectroscopy with the 6Li(π-,K+)X reaction to search for 6ΛH (2017)
  • Author(s): R. Honda, T. Koike, K. Miwa, A. Sakaguchi, H. Tamura, M. Ukai, T. Yamamoto et al.
  • Journal Title: Phys. Rev. C Volume: 96 Issue: 1 Pages: 014005-014005
  • DOI: 10.1103/physrevc.96.014005
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spectroscopy of Nuclei with Multi-Strangeness by Using New S-2S Spectrometer at J-PARC (2017)
  • Author(s): Gogami Toshiyuki、Nagae Tomofumi、他５０名
  • Journal Title: JPS Conference Proceedings Volume: 18 Pages: 011031-011031
  • DOI: 10.7566/jpscp.18.011031
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High Statistics Σp Scattering Experiment Using High Intensity Pion Beams at J-PARC (2017)
  • Author(s): K. Miwa, T. Koike, A. Sakaguchi, H. Tamura, M. Ukai, T. Yamamoto et al.
  • Journal Title: JPS Conf. Proc. Volume: 17 Pages: 041002-041002
  • DOI: 10.7566/jpscp.17.041002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] New Stage of S=-2 Hypernuclear Study Opened with a New High-resolution Spectrometer (2017)
  • Author(s): S. Kanatsuki, M. Moritsu et al.
  • Journal Title: PoS INPC2016 Volume: - Pages: 081-081
  • DOI: 10.22323/1.281.0081
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Construction Status of a New Spectrometer S-2S for Spectroscopy of Multi-Strangeness Systems at J-PARC (2016)
  • Author(s): Shunsuke Kanatsuki, Nobuaki Amano, Hiroyuki Ekawa, Toshiyuki Gogami, Erina Hirose, Yudai Ichikawa, Seigo Kato, Manabu Moritsu, Tomofumi Nagae, Hitoshi Takahashi, Toshiyuki Takahashi, Kohei Takenaka
  • Journal Title: JPS Conference Proceedings Volume: 17 Pages: 033008-033008
  • DOI: 10.7566/jpscp.17.033008
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] The COMET experiment: search for muon-to-electron conversion (2019)
  • Author(s): Manabu Moritsu
  • Organizer: The 3rd J-PARC Symposium (J-PARC2019)
  • Int'l Joint Research / Invited
• [Presentation] Commissioning of the Cylindrical Drift Chamber for the COMET experiment (2019)
  • Author(s): Manabu Moritsu
  • Organizer: EPS-HEP2019 - European Physical Society Conference on High Energy Physics
  • Int'l Joint Research
• [Presentation] Antiproton-induced background in μ-e conversion experiments (2019)
  • Author(s): Manabu Moritsu
  • Organizer: CLFV2019 - 3rd International Conference on Charged Lepton Flavor Violation
  • Int'l Joint Research
• [Presentation] COMET-CDCの宇宙線を用いた性能評価試験（６） (2019)
  • Author(s): 森津学
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Status of the COMET experiment (2018)
  • Author(s): Manabu Moritsu
  • Organizer: 20th Workshop on Neutrinos from Accelerators (NuFACT2018)
  • Int'l Joint Research / Invited
• [Presentation] Construction and performance tests of the COMET CDC (2018)
  • Author(s): Manabu Moritsu
  • Organizer: 39th International Conference on High Energy Physics (ICHEP2018)
  • Int'l Joint Research
• [Presentation] COMET -- search for mu-e conversion (2018)
  • Author(s): 森津学
  • Organizer: 第8回「Muon科学と加速器研究」研究会
• [Presentation] OMET-CDCの宇宙線を用いた性能評価試験（４） (2018)
  • Author(s): 森津学
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Overview of CDC cosmic-ray test (2017)
  • Author(s): Manabu Moritsu
  • Organizer: 23rd COMET International Collaboration Meeting
  • Int'l Joint Research