High-precision measurement of electron-neutrino with a water Cherenkov detector

• Project/Area Number: 26800128
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: TANAKA Hidekazu 東京大学, 宇宙線研究所, 特任助教 (00402769)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: ニュートリノ / CP対称性 / 光電子増倍管 / ニュートリノ振動

Outline of Final Research Achievements

T2K experiment is a long baseline neutrino experiment using high quality neutrino beam generated at J-PARC and Super-Kamiokande as the far detector. T2K obtained a definitive results on electron neutrino appearance. That is a breakthrough to measure the neutrino CP symmetry which could explain the matter dominant universe.
This study aims to improve the measurement precision of electron neutrino appearance, in order to measure the CP symmetry first time, by carrying out detailed SK detector calibrations and by improving the SK event reconstruction algorithm based on the calibration results.

Research Products

• [Journal Article] Measurement of neutrino and antineutrino oscillations by the T2K experiment including a new additional sample of ne interactions at the far detector (2017)
  • Author(s): T. Nakaya, T. Nakadaira, A.K. Ichikawa, Y. Seiya, A. Minamino 他（T2K Collaboration 約300名）
  • Journal Title: Phys. Rev. D Volume: 96 Issue: 9 Pages: 092006-092006
  • DOI: 10.1103/physrevd.96.092006
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Updated T2K measurements of muon neutrino and antineutrino disappearance using 1.5×10^21 protons on target (2017)
  • Author(s): T. Nakaya, T. Nakadaira, A.K. Ichikawa, Y. Seiya 他 (T2K Collaboration 約300名)
  • Journal Title: Phys. Rev. D Volume: 96 Issue: 1 Pages: 011102-011102
  • DOI: 10.1103/physrevd.96.011102
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for nucleon decay into charged antilepton plus meson in 0.316 megaton・years exposure of the Super-Kamiokande water Cherenkov detector (2017)
  • Author(s): Super-Kamiokande Collaboration
  • Journal Title: Physical Review D Volume: 96 Issue: 1 Pages: 012003-012003
  • DOI: 10.1103/physrevd.96.012003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Combined Analysis of Neutrino and Antineutrino Oscillations at T2K (2017)
  • Author(s): T. Nakaya, M. Yokoyama and the T2K Collaboration
  • Journal Title: Phys. Rev. Lett Volume: 118 Issue: 15 Pages: 151801-151801
  • DOI: 10.1103/physrevlett.118.151801
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 15.Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6×10^20 protons on target (2015)
  • Author(s): T2K collaboration (K.Abe et.al)
  • Journal Title: Physical Review D Volume: 91 Issue: 7 Pages: 072010-072010
  • DOI: 10.1103/physrevd.91.072010
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Neutrino Oscillation Physics Potential of the T2K Experiment (2015)
  • Author(s): T.Hasegwa, L.Zambelli, et. al.
  • Journal Title: PTEP Volume: 2015-4 Issue: 4
  • DOI: 10.1093/ptep/ptv031
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Calibration of the Super-Kamiokande Detector (2014)
  • Author(s): K. Abe et al. (Super-Kamiokande Collaboration)
  • Journal Title: Nuclear Inst. and Methods in Physics Research Volume: 737 Pages: 253-272
  • DOI: 10.1016/j.nima.2013.11.081
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] スーパーカミオカンデ有効体積拡張に向けた検出器較正と再構成アルゴリズム開発 (2018)
  • Author(s): 竹中彰, 塩澤眞人, 田中秀和
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] Hyper-Kamiokande (2017)
  • Author(s): Hide-Kazu TANAKA
  • Organizer: Topics in Astroparticle and Underground Physics (TAUP2017)
  • Int'l Joint Research / Invited
• [Presentation] スーパーカミオカンデ有効体積拡張に向けた検出器較正 (2017)
  • Author(s): 竹中彰, 塩澤眞人, 田中秀和
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] Hyper-Kamiokande detector design and calibration (2016)
  • Author(s): Hide-Kazu TANAKA
  • Organizer: International Workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN16)
  • Place of Presentation: Institute of High Energy Physics, Beijing, China
  • Year and Date: 2016-11-03
  • Int'l Joint Research / Invited
• [Presentation] スーパーカミオカンデにおける荷電レプトンとメソンへの核子崩壊探索 (2016)
  • Author(s): 田中秀和、他 Super-Kamiokande collaboration
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: 宮崎大学
  • Year and Date: 2016-09-21
• [Presentation] Overview of neutrino oscillation measurements (2016)
  • Author(s): Hide-Kazu TANAKA
  • Organizer: Neutrino Oscillation Tomography Workshop
  • Place of Presentation: Earthquake Research Institute, the University of Tokyo, Japan
  • Year and Date: 2016-01-07
  • Int'l Joint Research / Invited
• [Presentation] Neutrino Interaction Generators (2015)
  • Author(s): Hide-Kazu TANAKA
  • Organizer: 10th International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt15)
  • Place of Presentation: Osaka University, Japan
  • Year and Date: 2015-11-16
  • Int'l Joint Research / Invited
• [Presentation] Hyper-Kamiokande (2015)
  • Author(s): Hide-Kazu TANAKA
  • Organizer: International Workshop for the Next Generation Nucleon Decay and Neutrino Detector (NNN15)
  • Place of Presentation: Stony Brook University, USA
  • Year and Date: 2015-10-28
  • Int'l Joint Research / Invited
• [Presentation] T2K実験の反電子型ニュートリノ出現事象探索 (2015)
  • Author(s): 田中秀和
  • Organizer: 日本物理学会
  • Place of Presentation: 早稲田大学早稲田キャンパス（東京都新宿区）
  • Year and Date: 2015-03-22
• [Presentation] Neutrino Interaction Physics (2014)
  • Author(s): Hidekazu TANAKA
  • Organizer: NuFact2014, XVIth International Workshop on Neutrino Factories and Future Neutrino Facilities
  • Place of Presentation: University of Glasgow, UK
  • Year and Date: 2014-08-30
  • Invited
• [Presentation] Hyper-Kamiokande Detector (2014)
  • Author(s): Hidekazu TANAKA
  • Organizer: Neutrino 2014, The 26th International Conference on Neutrino Physics and Astrophysics
  • Place of Presentation: Boston University, USA
  • Year and Date: 2014-06-03
• [Remarks] T2K Experiment
  • URL: http://t2k-experiment.org/
• [Remarks] Super-Kamiokande
  • URL: http://www-sk.icrr.u-tokyo.ac.jp/sk/index.html
• [Remarks] Hyper-Kamiokande
  • URL: http://www.hyperk.org/
• [Remarks] T2K Experiment
  • URL: http://t2k-experiment.org
• [Remarks] Hyper-Kamiokande
  • URL: http://www.hyper-k.org/
• [Remarks] Super-Kamiokande
  • URL: http://www-sk.icrr.u-tokyo.ac.jp/sk