Maximizing Sensitivity to CP Violation in Near Future Neutrino Experiments

• Project/Area Number: 23540315
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: MINAKATA Hisakazu 首都大学東京, 理工学研究科, 名誉教授 (00112475)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: CP非保存 / ニュートリノ振動 / フレーバー混合 / 牧-中川-坂田行列 / レプトン混合角 / 加速器ニュートリノ / 原子炉ニュートリノ / パラメター縮退 / 1-3角 / 反ニュートリノ モード / 反ニュートリノ

Research Abstract

CP violating phase is the unique unknown quantity among the lepton flavor mixing parameters. Given precision measurement of theta13 by the reactor measurement, we have investigated the sensitivity to the Kobayashi-Maskawa type lepton CP phase which can be reached by T2K (in Japan) or NOVA (in USA) experiments alone, and when they are combined. We used a reliable analysis code written with kind help of Masashi Yokoyama (T2K collaborator) and the results were presented with use of the newly proposed "CP exclusion fraction" by us. Assuming the operation of 10 years of each experiment, it was shown that T2K is able to exclude about a half of CP phase space at 90% CL, while NOVA's sensitivity is slightly less. Complementarity between T2K and NOVA experiments is also illuminated.

Research Products

• [Journal Article] What can we learn about the lepton CP phase in the next 10 years? (2014)
  • Author(s): P.A.N. Machado, H. Minakata, H. Nunokawa, and R. Zukanovich Funchal
  • Journal Title: Journal of High Energy Physics Volume: Vol. 1405 Pages: 109-109
  • Peer Reviewed
• [Journal Article] What can we learn about the lepton CP phase in the next 10 years? (2014)
  • Author(s): P. A. N. Machado, H. Minakata, H. Nunokawa, and R. Zukanovich Funchal
  • Journal Title: Journal of High Energy Physics Volume: 05 Pages: 1-16
  • Peer Reviewed
• [Journal Article] Precision Measurements of theta23 and delta Using only the Electron Neutrino Appearance Experiments (2013)
  • Author(s): H. Minakata and S.J. Parke, Correlated
  • Journal Title: Physical Review D Volume: Vol. 87
  • Peer Reviewed
• [Journal Article] レプトンフレーバー混合とニュートリノ質量 : 到達点と近未来 (2013)
  • Author(s): 南方久和
  • Journal Title: 日本物理学会誌 Volume: Vol. 68, No. 11 Pages: 723-733
  • Peer Reviewed
• [Journal Article] Correlated, Precision Measurements of theta_(23) and delta Using only the Electron Neutrino Appearance Experiments (2013)
  • Author(s): H. Minakata and S. J. Parke
  • Journal Title: Physical Review D Volume: 87 Issue: 11
  • DOI: 10.1103/physrevd.87.113005
  • Peer Reviewed
• [Journal Article] Solar Neutrino Observables Sensitive to Matter Effects (2012)
  • Author(s): H. Minakata and C. Pena-Garay
  • Journal Title: Advances in High Energy Physics Volume: Vol. 2012
  • Peer Reviewed
• [Journal Article] Combining Accelerator and Reactor Measurements of theta13 : The First Result (2012)
  • Author(s): P.A.N. Machado, H. Minakata, H. Nunokawa, and R. Zukanovich Funchal
  • Journal Title: Journal of High Energy Physics Volume: Vol. 1205
  • Peer Reviewed
• [Journal Article] Neutrino Velocity and Neutrino Oscillations (2012)
  • Author(s): H. Minakata and A. Yu Smirnov
  • Journal Title: Physical Review D Volume: Vol. 85
  • Peer Reviewed
• [Journal Article] 最後の混合角 θ13の発見ハリティ (2012)
  • Author(s): 南方久和
  • Journal Title: 特集「物理科学, この1 年」 Volume: Vol. 27, No. 01 Pages: 52-53
• [Journal Article] Combining Accelerator and Reactor Measurements of theta_{13}: The First Result (2012)
  • Author(s): P. A. N. Machado, H. Minakata, H. Nunokawa, and R. Zukanovich Funchal
  • Journal Title: Journal of High Energy Physics Volume: 1205 Issue: 5
  • DOI: 10.1007/jhep05(2012)023
  • Peer Reviewed
• [Journal Article] Large-theta13 Perturbation Theory of Neutrino Oscillation for Long-Baseline Experiments (2011)
  • Author(s): K. Asano and H. Minakata
  • Journal Title: Journal of High Energy Physics Volume: Vol. 1106
  • Peer Reviewed
• [Journal Article] Non-Standard Interactions at a Neutrino Factory : Correlations and CP Violation (2011)
  • Author(s): P. Coloma, A. Donini, J. Lopez-Pavon, and H. Minakata
  • Journal Title: Journal of High Energy Physics Volume: Vol. 1108
  • Peer Reviewed
• [Journal Article] Large-theta_{13} Perturbation Theory of Neutrino Oscillation for Long-Baseline Experiments (2011)
  • Author(s): K. Asano and H. Minakata
  • Journal Title: Journal of High Energy Physics Volume: 1106 Issue: 6
  • DOI: 10.1007/jhep06(2011)022
  • Peer Reviewed
• [Presentation] Precision measurement of mixing angles and CP (2013)
  • Author(s): H. Minakata
  • Organizer: International workshop on RENO-50 toward Neutrino Mass Hierarchy
  • Place of Presentation: Seoul National University, Seoul, Korea
  • Invited
• [Presentation] theta23 and delta can be measured accurately at the same time (2013)
  • Author(s): H. Minakata
  • Organizer: Talk at XXIV International Workshop on Weak Interactions and Neutrinos - WIN'13
  • Place of Presentation: Natal, Brazil
• [Presentation] Neutrino Physics Now and in the Near Future (2013)
  • Author(s): H. Minakata
  • Organizer: 10th International Symposium on Cosmology and Particle Astrophysics (CosPA2013)
  • Place of Presentation: Honolulu, Hawaii
  • Invited
• [Presentation] theta_(23) and delta can be measured accurately at the same time (2013)
  • Author(s): H. Minakata
  • Organizer: XXIV International Workshop on Weak Interactions and Neutrinos - WIN'13, eptember 16-21, 2013.
  • Place of Presentation: Natal, Brazil
• [Presentation] Neutrino Physics Now and in the Near Future (2013)
  • Author(s): H. Minakata
  • Organizer: 10th International Symposium on Cosmology and Particle Astrophysics (CosPA2013)
  • Place of Presentation: Honolulu, Hawaii, USA
  • Invited
• [Presentation] Looking for Nonstandard Neutrino-Matter Interactions with Large theta13 (2012)
  • Author(s): H. Minakata
  • Organizer: Nu HoRIzons V "Neutrinos in Physics, Astrophysics and Cosmology"
  • Place of Presentation: Harish-Chandra Research Institute, Allahabad, Indi
  • Invited
• [Presentation] theta13 is large : what is next? (2012)
  • Author(s): H. Minakata
  • Organizer: NuTURN2012-Neutrino at the Turning Point
  • Place of Presentation: INFN - Laboratori Nazionali del Gran Sasso, Assergi, Italy
  • Invited
• [Presentation] Phenomenology of Future Neutrino Experiments with Large theta13 (2012)
  • Author(s): H. Minakata
  • Organizer: XXIV International Conference on Neutrino Physics and Astrophysics (Neutrino 2012)
  • Place of Presentation: Kyoto, Japan(Published in Nuclear Physics B - Proceedings Supplements Vol. 235-236 (2013) 173-179)
  • Invited
• [Presentation] Neutrino Oscillation and Neutrino Velocity (2012)
  • Author(s): H. Minakata
  • Organizer: Alexei Smirnov Fest and "What is nu": From new experimental neutrino results to a deeper understanding of theoretical physics and cosmology, The Galileo Galilei Institute for Theoretical Physics
  • Place of Presentation: Arcetri, Florence, Italy
  • Invited
• [Presentation] Introduction to the Standard Model I-II (2012)
  • Author(s): H. Minakata
  • Organizer: The 4th International Summer School on Neutrino Physics (INSS2012)
  • Place of Presentation: Blacksburg, Virginia, USA
  • Invited
• [Presentation] Phenomenology of Future Neutrino Experiments with Large theta_{13} (2012)
  • Author(s): H. Minakata
  • Organizer: XXIV International Conference on Neutrino Physics and Astrophysics (Neutrino 2012)
  • Place of Presentation: Kyoto, Japan
  • Invited
• [Presentation] Theta_{13} is large: what is next? (2012)
  • Author(s): H. Minakata
  • Organizer: NuTURN2012-Neutrino at the Turning Point
  • Place of Presentation: Gran Sasso Laboratory, Assergi, Italy
  • Invited
• [Presentation] Neutrino Oscillation and Neutrino Velocity (2012)
  • Author(s): H. Minakata
  • Organizer: ``What is nu'': From new experimental neutrino results to a deeper understanding of theoretical physics and cosmology
  • Place of Presentation: Galileo Galilei Institute for Theoretical Physics, Florence, Italy
  • Invited
• [Presentation] If theta13 is Large, then What? (2011)
  • Author(s): H. Minakata
  • Organizer: Talk at 13th International Workshop on Neutrino Factories, Superbeams and Betabeams (NuFact11)
  • Place of Presentation: CERN-University of Geneva, Geneva, Switzerland
• [Presentation] I Era of the accelerator and reactor theta13 experiments (2011)
  • Author(s): H. Minakata
  • Organizer: International Workshop on Double Beta Decay and Neutrinos
  • Place of Presentation: Osaka, Japan
  • Invited
• [Presentation] If theta_{13} is Large, then What? (2011)
  • Author(s): H. Minakata
  • Organizer: 13th International Workshop on Neutrino Factories, Superbeams and Betabeams
  • Place of Presentation: CERN, Geneva