Measurement of particle-antiparticle symmetry breaking in neutrinos and R&D for the future

• Project/Area Number: 23340056
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: SHIOZAWA Masato 東京大学, 宇宙線研究所, 准教授 (70272523)
• Co-Investigator(Kenkyū-buntansha): HAYATO Yoshinari 東京大学, 宇宙線研究所, 准教授 (60321535)
• Co-Investigator(Renkei-kenkyūsha): MIURA Makoto 東京大学, 宇宙線研究所, 助教 (10272519) ; NAKAYAMA Shoei 東京大学, 宇宙線研究所, 特任助教 (70401289)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2012: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000); Fiscal Year 2011: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
• Keywords: ニュートリノ / CP対称性 / CPT対称性 / スーパーカミオカンデ / 大気ニュートリノ / ニュートリノ振動 / 対称性の破れ

Research Abstract

This research aimed to understand more about the three flavor framework of lepton particles by experimental tests of particle-antiparticle symmetry violation in neutrinos. We have looked for possible difference between neutrino oscillations and antineutrino oscillations in the atmospheric neutrino data by world largest neutrino oscillation detector Super-Kamiokande. We tested two hypotheses - CP and CPT symmetry violation - and found no evidence of symmetry violation and concluded that both CP and CPT symmetries are conserved within the experimental errors.

Research Products

• [Journal Article] スーパーカミオカンデコラボレーション, Evidence for the Appearance of Atmospheric Tau Neutrinos in Super-Kamiokande (2013)
  • Author(s): 塩澤眞人, 早戸良成, 三浦真, 中山祥英, 他
  • Journal Title: Phys. Rev. Lett Volume: 110 Issue: 18 Pages: 181802-181802
  • DOI: 10.1103/physrevlett.110.181802
  • Peer Reviewed
• [Journal Article] Future Long-Baseline Neutrino Facilities and Detectors (2013)
  • Author(s): 長谷川琢哉 他
  • Journal Title: Advances in High Energy Physics Volume: 2013 Pages: 460123-460123
  • DOI: 10.1155/2013/460123
  • Peer Reviewed / Open Access
• [Journal Article] Study of non-standard neutrino interactions with atmospheric neutrino data in Super-Kamiokande I and II (2011)
  • Author(s): G. Mitsuka, J. Kameda, M. Miura, Y. Obayashi, T. Kajita, K. Okumura
  • Journal Title: Phys. Rev. D Volume: 84 Issue: 11 Pages: 113008-1
  • DOI: 10.1103/physrevd.84.113008
  • Peer Reviewed
• [Journal Article] Search for differences in oscillation parameters for atmospheric neutrinos and anti-neutrinos at Super-Kamiokande (2011)
  • Author(s): K. Abe J. Kameda, M. Miura, Y. Obayashi, T. Kajita, K. Okumura
  • Journal Title: Phys. Rev. Lett Volume: 107 Issue: 24 Pages: 241801-1
  • DOI: 10.1103/physrevlett.107.241801
  • Peer Reviewed
• [Journal Article] An Indirect Search for WIMPs in the Sun using 3109.6 days of upward-going muons in Super-Kamiokande (2011)
  • Author(s): T. Tanaka et al. (Super-Kamiokande collaboration)
  • Journal Title: Astrophysical Journal Volume: 742 Issue: 2 Pages: 78-83
  • DOI: 10.1088/0004-637x/742/2/78
  • Peer Reviewed
• [Presentation] Projects in Japan (2014)
  • Author(s): 塩澤眞人
  • Organizer: Les Rencontres de Physique de la Vall, Aie d'Aoste
  • Place of Presentation: La Thuile, Italy
• [Presentation] Projects in Japan (2014)
  • Author(s): Masato Shiozawa
  • Organizer: Les Rencontres de Physique de la Vall,Aie d'Aoste
  • Place of Presentation: La Thuile, Italy
  • Invited
• [Presentation] Super-K, T2K, and beyond (2013)
  • Author(s): 塩澤眞人
  • Organizer: 2013年理論懇シンポジウム
  • Place of Presentation: 千葉
  • Year and Date: 2013-12-25
• [Presentation] 大気ニュートリノ研究とハイパーカミオカンデ準備研究 (2013)
  • Author(s): 塩澤眞人
  • Organizer: ニュートリノフロンティアの融合と進化研究会
  • Place of Presentation: 東京
  • Year and Date: 2013-04-21
• [Presentation] Nucleon Decay Searches (2013)
  • Author(s): 塩澤眞人
  • Organizer: 13th International Conference on Topics in Astroparticle and Underground Physics
  • Place of Presentation: California, USA
• [Presentation] Future Neutrino and Nucleon Decay Program (2013)
  • Author(s): 塩澤眞人
  • Organizer: 26th International Symposium on Lepton Photon Interactions at High Energies
  • Place of Presentation: San Francisco, USA
• [Presentation] Status of NEUT/ needs for T2K, SK (2013)
  • Author(s): Yoshinari Hayato
  • Organizer: neutrino-nucleus generators - present and future
  • Place of Presentation: Pittsburgh, USA
  • Invited
• [Presentation] Recent results of the atmospheric neutrino analysis in SK (2012)
  • Author(s): 早戸良成
  • Organizer: International Conference on High Energy Physics 2012 (ICHEP2012)
  • Place of Presentation: オーストラリア、メルボルン
• [Presentation] Results from running experiments (2012)
  • Author(s): 伊藤好孝
  • Organizer: The XXV International Conference on Neutrino Physics and Astrophysics
  • Place of Presentation: 日本、京都テルサ
  • Invited
• [Presentation] Latest SK atmospheric nu oscillation analysis (2012)
  • Author(s): Roger Wendell
  • Organizer: Neutrino Oscillation Workshop 2012 (NOW2012)
  • Place of Presentation: イタリア、オトラント
  • Invited
• [Presentation] The Hyper-Kamiokande project (2012)
  • Author(s): 塩澤眞人
  • Organizer: Neutrino Oscillation Workshop 2012 (NOW2012)
  • Place of Presentation: イタリア、オトラント
  • Invited
• [Presentation] Atmospheric Results from Super-K (2012)
  • Author(s): Roger Wendell
  • Organizer: International Workshop on Next Generation Nucleon Decay and Neutrino Detectors 2012 (NNN12)
  • Place of Presentation: 米国、バタビア
  • Invited
• [Presentation] Deep Underground Labs in Kamioka (2011)
  • Author(s): 塩澤眞人
  • Organizer: ASPERA Workshop
  • Place of Presentation: スペイン、ザラゴザ
  • Invited
• [Presentation] Design and physics potential of Hyper-Kamiokande (2011)
  • Author(s): 塩澤眞人
  • Organizer: 12th International Workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN11)
  • Place of Presentation: スイス、チューリッヒ
  • Invited
• [Presentation] Direction for Neutrino Physics in Asia (2011)
  • Author(s): 塩澤眞人
  • Organizer: Fundamental Physics at the Intensity Frontier Workshop
  • Place of Presentation: 米国、ワシントン
  • Invited
• [Remarks]
  • URL: http://www-sk.icrr.u-tokyo.ac.jp/index.html
• [Remarks] 大気ニュートリノ中のタウ型ニュートリノ出現現象を確認
  • URL: http://www-sk.icrr.u-tokyo.ac.jp/whatsnew/new-20140324.html
• [Remarks] 東京大学宇宙線研究所神岡宇宙素粒子研究施設
  • URL: http://www-sk.icrr.u-tokyo.ac.jp/index.html
• [Remarks] スーパーカミオカンデ
  • URL: http://www-sk.icrr.u-tokyo.ac.jp/sk/index.html
• [Remarks] スーパーカミオカンデ
  • URL: http://www-sk.icrr.u-tokyo.ac.jp/sk/index.html