Resolvingθ23degeneracy by accelerator and reactor neutrino oscillation experiments

2006/01/31 by K. Hiraide, Katsuki Hiraide, Hisakazu Minakata +9 · 48 citations
Mathematics · Physics and Astronomy · #Algorithm #Astrophysics and Cosmic Phenomena #CP violation #Degeneracy (biology) #Degenerate energy levels #Lepton #Mathematics #Neutrino Physics Research #Nuclear physics #Octant (instrument) #Optics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.73.093008

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 73(9) (American Physical Society) · 23 pages, 9 figures, version to appear in PRD

arxiv created 2006/05/25 · openalex publication_date 2006/05/31 · arxiv updated 2011/09/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

If the lepton mixing angle \ensuremathθ₂₃ is not maximal, there arises a problem of ambiguity in determining \ensuremathθ₂₃ due to the existence of two degenerate solutions, one in the first and the other in the second octant. We discuss an experimental strategy for resolving the \ensuremathθ₂₃ octant degeneracy by combining reactor measurement of \ensuremathθ₁₃ with accelerator \ensuremathν_\ensuremathμ disappearance and \ensuremathν_e appearance experiments. The robustness of the \ensuremathθ₂₃ degeneracy and the difficulty in lifting it only by accelerator experiments with conventional \ensuremathν_\ensuremathμ (and \ensuremathν_\ensuremathμ) beams are demonstrated by analytical and numerical treatments. Our method offers a way to overcome the difficulty and can resolve the degeneracy between solutions sin²\ensuremathθ₂₃=0.4 and sin²\ensuremathθ₂₃=0.6 if sin²2\ensuremathθ₁₃\ensuremath\gtrsim0.05 at 95% CL by assuming the T2K phase II experiment and a reactor measurement with an exposure of 10 GW\ifmmode⋅\else\textperiodcentered\fikt\ifmmode⋅\else\textperiodcentered\fiyr. The dependence of the resolving power of the octant degeneracy on the systematic errors of reactor experiments is also examined.

Citations

• CERN to Gran Sasso; An ideal distance for superbeam?
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• Exploring leptonic CP violation by reactor and neutrino superbeam experiments
• The Flavor Symmetry
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• Status of global fits to neutrino oscillations
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• Atmospheric ratio in the multi-GeV energy range
• Measuring the deviation of the 2–3 lepton mixing from maximal with atmospheric neutrinos
• Measurement of the Rate ofνe+d→p+p+e−Interactions Produced byB<mml:mprescripts/>8Solar Neutrinos at the Sudbury Neutrino Observatory
• Search for Electron Neutrino Appearance in a 250 km Long-Baseline Experiment
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by

• Resolving the octant θ23 degeneracy by neutrino oscillation experiments