Erratum to: “Solving the neutrino parameter degeneracy by measuring the T2K off-axis beam in Korea” [Phys. Lett. B 637 (2006) 266]

Hagiwara, Kaoru; Okamura, N.; Senda, Ken-ichi

doi:10.1016/j.physletb.2006.09.003

Cited by 41 publications

(134 citation statements)

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“…The mass hierarchy and the CP phase are mainly determined by the difference of the ν e appearance probability between SK and L ≃ 1000 Km at the first oscillation maximum [13,1], which is proportional to the matter density and the sign of δ m 2 31 . A higher energy neutrino beam, s.t.…”

Section: Neutral Current Eventmentioning

confidence: 99%

“…We find that the number of single π 0 events grows with decreasing off-axis angle, especially for the angles below 2.0 • which have been envisaged in ref. [13,14] as an optimal choice for the far detector in Korea.…”

Section: Neutral Current Eventmentioning

confidence: 99%

“…In the previous studies [13,14], we explored the physics potential of the T2KK (Tokai-to-Kamioka-andKorea) experiment, which is an idea of placing an additional far detector in Korea along the T2K neutrino beam line. We find that the neutrino-mass hierarchy pat- 1 After Oct.1, 2009 : Univ.…”

Section: Introductionmentioning

confidence: 99%

“…We find that the neutrino-mass hierarchy pat- 1 After Oct.1, 2009 : Univ. of Yamanashi, Kofu, Japan tern can be determined by the T2KK experiment, if sin 2 2θ 13 ∼ > 0.05 for 3σ [13]. The CP phase can also be measured if sin 2 2θ 13 ∼ > 0.02 with ±30 • accuracy [13].…”

Section: Introductionmentioning

confidence: 99%

“…of Yamanashi, Kofu, Japan tern can be determined by the T2KK experiment, if sin 2 2θ 13 ∼ > 0.05 for 3σ [13]. The CP phase can also be measured if sin 2 2θ 13 ∼ > 0.02 with ±30 • accuracy [13]. However, these analysis have been done without the backgrounds and using neutrino energy for event binning.…”

Section: Introductionmentioning

confidence: 99%

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Re-analysis of the T2KK physics potential with backgrounds

Okamura¹,

Kaplan²,

Goodman³

et al. 2010

AIP Conference Proceedings

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Abstract. The Tokai-to-Kamioka-and-Korea (T2KK) neutrino oscillation experiment is one of the ideas to measure the neutrino mass hierarchy and the CP phase in the lepton flavor mixing matrix. We re-analyze the physics potential of the T2KK experiment by taking into account the smearing of reconstructed neutrino energy due to finite resolution of electron or muon energies, nuclear Fermi motion and resonance production, as well as the neutral current π 0 production background to the ν µ → ν e oscillation signal. It is found that the mass hierarchy pattern can still be determined at 3σ level if sin 2 2θ 13 ≡ 4|U e3 | 2 (1 − |U e3 | 2 ) ∼ > 0.08 (0.09), when the hierarchy is normal (inverted) with 5 × 10 21 POT (protons on target) exposure, for a combination of relatively large (3.0 • ) off-axis angle beam at Super-Kamiokande (SK) and small (0.5 • ) offaxis angle at 100 kton waterČerenkov detector in Korea (L = 1000 km). δ MNS can still be constrained with an accuracy of ≃ ±45 • (±60 • ) at 1σ level for the normal (inverted) hierarchy with the above exposure when sin 2 2θ 13 ∼ > 0.04 and δ MNS = 0 • . This talk is base on Ref. [1].

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Section: Neutral Current Eventmentioning

confidence: 99%

Section: Neutral Current Eventmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Re-analysis of the T2KK physics potential with backgrounds

Okamura¹,

Kaplan²,

Goodman³

et al. 2010

AIP Conference Proceedings

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Physics potential of neutrino oscillation experiment with a far detector in Oki Island along the T2K baseline

Hagiwara

Kiwanami

Okamura

et al. 2013

J. High Energ. Phys.

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Oki Island is located between Japan and Korea along the Tokai-To-Kamioka (T2K) baseline. The distance from J-PARC to Oki Island is about 653km, which is twice that of the T2K experiment (L = 295km). When the off-axis angle of the neutrino beam from J-PARC is 3.0 • (2.0 • ) at Super-Kamiokande (SK), the off-axis beam (OAB) with 1.4 • (0.6 • ) reaches at Oki Island. We examine physics case of placing a far detector in Oki Island during the T2K experimental period. We estimate the matter density profile along the Tokai-to-Oki baseline by using recent seismological measurements. For a detector of 100 kton fiducial volume and 2.5 × 10 21 POT (protons on target) exposure for both ν µ andν µ beams, we find that the mass hierarchy pattern can be distinguished at 3 σ level if sin 2 2θ RCT ≡ 4|U e3 | 2 (1 − |U e3 | 2 ) ∼ > 0.09, by observing the electron-like CCQE (Charged-Current Quasi Elastic) events. The CP phase in the Maki-Nakagawa-Sakata lepton flavor mixing matrix, δ MNS , can be constrained with ±20 • . As a reference, we repeat the same analysis by placing the same detector in Korea at L = 1000 km and OAB=0.5 • (T2KK) and also by placing it at the SK site (T2K 122 ). The Tokai-to-Kamioka-OKI (T2KO) sensitivity to the mass hierarchy is about 1/3 (in ∆χ 2 min ) of T2KK, while the sensitivity to the phase δ MNS is similar between T2KO and T2KK. The T2K 122 option has almost no sensitivity to the mass hierarchy, and cannot measure the CP phase except when δ MNS ∼ −90 • (90 • ) for the normal (inverted) hierarchy.Even after θ RCT , the smallest of the three mixing angles, is measured by the accelerator based long baseline experiments [14,15] and the reactor experiments [16,17,23], three unknowns remain in the 3 neutrino model, which are the sign of the larger mass-squared differences, normal (m 2 3 −m 2 1 > 0) or inverted (m 2 3 −m 2 1 < 0), the leptonic CP phase (δ MNS ), and the sign of sin 2 θ ATM − 0.5 if its magnitude differs from zero significantly. The main purpose of the next generation neutrino oscillation experiments is to determine these three unknown parameters of the three neutrino model.The accelerator based long baseline neutrino oscillation experiment with two-detectors for one-beam, such as Tokai-to-Kamioka-and-Korea (T2KK) experiment [24]- [30], is one of the promising experiments for measuring all the three unknowns. When one measures the neutrino energy (E ν ) and the magnitude of the ν e appearance probability at significantly different baseline lengths, the degeneracy between the sign of the larger mass-squared difference and the CP phase can be resolved [26]-[30], since they affect the magnitude of the ν e appearance probability and the neutrino energy at the first oscillation maximum differently at the two baseline lengths. Once the mass hierarchy and the CP phase are determined, the sign of sin 2 θ ATM − 0.5 can be determined [28] since the ν µ → ν e oscillation probability is proportional to sin 2 θ ATM sin 2 θ RCT .In the previous works [26]- [30], physics impacts of the T2KK experiment have ...

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The earth matter effects in neutrino oscillation experiments from Tokai to Kamioka and Korea

Hagiwara

Okamura

Senda

2011

J. High Energ. Phys.

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We study the earth matter effects in the Tokai-to-Kamioka-and-Korea experiment (T2KK), which is a proposed extension of the T2K (Tokai-to-Kamioka) neutrino oscillation experiment between J-PARC at Tokai and Super-Kamiokande (SK) in Kamioka, where an additional detector is placed in Korea along the same neutrino beam line. By using recent geophysical measurements, we examine the earth matter effects on the oscillation probabilities at Kamioka and Korea. The average matter density along the Tokai-to-Kamioka baseline is found to be 2.6 g/cm 3 , and that for the Tokai-to-Korea baseline is 2.85, 2.98, and 3.05 g/cm 3 for the baseline length of L-= 1000, 1100, and 1200 km, respectively. The uncertainty of the average density is about 6%, which is determined by the uncertainty in the correlation between the accurately measured sound velocity and the matter density. The effect of the matter density distribution along the baseline is studied by using the step function approximation and the Fourier analysis. We find that the ν µ → ν e oscillation probability is dictated mainly by the average matter density, with small but non-negligible contribution from the real part of the first Fourier mode. We also find that the sensitivity of the T2KK experiment on the neutrino mass hierarchy does not improve significantly by reducing the matter density error from 6% to 3%, since the measurement is limited by statistics for the minimum scenario of T2KK with SK at Kamioka and a 100 kt detector in Korea considered in this report. The sensitivity of the T2KK experiment on the neutrino mass hierarchy improves significantly by splitting the total beam time into neutrino and anti-neutrino runs, because the matter effect term contributes to the oscillation amplitudes with the opposite sign. *

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Erratum to: “Solving the neutrino parameter degeneracy by measuring the T2K off-axis beam in Korea” [Phys. Lett. B 637 (2006) 266]

Cited by 41 publications

References 0 publications

Re-analysis of the T2KK physics potential with backgrounds

Re-analysis of the T2KK physics potential with backgrounds

Physics potential of neutrino oscillation experiment with a far detector in Oki Island along the T2K baseline

The earth matter effects in neutrino oscillation experiments from Tokai to Kamioka and Korea

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