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Title: Resolving the eightfold neutrino parameter degeneracy by two identical detectors with different baselines

Abstract

We have shown in a previous paper that two identical detectors with each fiducial mass of 0.27 megaton water, one in Kamioka and the other in Korea, which receive the (anti-) muon neutrino beam of 4 MW power from J-PARC facility have potential of determining the neutrino mass hierarchy and discovering CP violation by resolving the degeneracies associated with them. In this paper, we point out that the same setting has capability of resolving the {theta}{sub 23} octant degeneracy in region where sin{sup 2}2{theta}{sub 23} < or approx. 0.97 at 2 standard deviation confidence level even for very small values of {theta}{sub 13}. Altogether, it is demonstrated that one can solve all the eightfold neutrino parameter degeneracies in situ by using the Tokai-to-Kamioka-Korea setting if {theta}{sub 13} is within reach by the next generation superbeam experiments. We also prove the property called 'decoupling between the degeneracies', which is valid to first-order in perturbation theory of the earth matter effect, that guarantees approximate independence between analyses to solve any one of the three different type of degeneracies.

Authors:
;  [1];  [2];  [3]
  1. Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582 (Japan)
  2. Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan)
  3. Departamento de Fisica, Pontificia Universidade Catolica do Rio de Janeiro, C. P. 38071, 22452-970, Rio de Janeiro (Brazil)
Publication Date:
OSTI Identifier:
20933209
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.75.013006; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANTINEUTRINO BEAMS; CP INVARIANCE; J-PARC; MASS; MUON NEUTRINOS; NEUTRINO BEAMS; PERTURBATION THEORY

Citation Formats

Kajita, Takaaki, Nakayama, Shoei, Minakata, Hisakazu, and Nunokawa, Hiroshi. Resolving the eightfold neutrino parameter degeneracy by two identical detectors with different baselines. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.013006.
Kajita, Takaaki, Nakayama, Shoei, Minakata, Hisakazu, & Nunokawa, Hiroshi. Resolving the eightfold neutrino parameter degeneracy by two identical detectors with different baselines. United States. doi:10.1103/PHYSREVD.75.013006.
Kajita, Takaaki, Nakayama, Shoei, Minakata, Hisakazu, and Nunokawa, Hiroshi. Mon . "Resolving the eightfold neutrino parameter degeneracy by two identical detectors with different baselines". United States. doi:10.1103/PHYSREVD.75.013006.
@article{osti_20933209,
title = {Resolving the eightfold neutrino parameter degeneracy by two identical detectors with different baselines},
author = {Kajita, Takaaki and Nakayama, Shoei and Minakata, Hisakazu and Nunokawa, Hiroshi},
abstractNote = {We have shown in a previous paper that two identical detectors with each fiducial mass of 0.27 megaton water, one in Kamioka and the other in Korea, which receive the (anti-) muon neutrino beam of 4 MW power from J-PARC facility have potential of determining the neutrino mass hierarchy and discovering CP violation by resolving the degeneracies associated with them. In this paper, we point out that the same setting has capability of resolving the {theta}{sub 23} octant degeneracy in region where sin{sup 2}2{theta}{sub 23} < or approx. 0.97 at 2 standard deviation confidence level even for very small values of {theta}{sub 13}. Altogether, it is demonstrated that one can solve all the eightfold neutrino parameter degeneracies in situ by using the Tokai-to-Kamioka-Korea setting if {theta}{sub 13} is within reach by the next generation superbeam experiments. We also prove the property called 'decoupling between the degeneracies', which is valid to first-order in perturbation theory of the earth matter effect, that guarantees approximate independence between analyses to solve any one of the three different type of degeneracies.},
doi = {10.1103/PHYSREVD.75.013006},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}