Resolving<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>θ</mml:mi><mml:mn>23</mml:mn></mml:msub></mml:math>degeneracy by accelerator and reactor neutrino oscillation experiments

Hiraide, K.; Minakata, Hisakazu; Nakaya, T.; Nunokawa, Hiroshi; Sugiyama, Hiroaki; Teves, W.J.C.; Funchal, R. Zukanovich

doi:10.1103/physrevd.73.093008

Cited by 52 publications

(75 citation statements)

References 84 publications

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“…We took the neutrino fluxes from the letter of intent of the Hyper-Kamiokande project [29] and the background from [9]. The cross sections and energy dependent efficiencies for charged current quasielastic (CC-QE) and non quasi-elastic (CC-NQE) events are simulated in a similar manner as in [5] to reproduce the energy spectra given in [29].…”

Section: Accelerator Experiments: T2k and Minosmentioning

confidence: 99%

“…[9], we have simulated the T2K signal in the ν µ → ν e appearance channel in a similar way as done in ref. [5]. We took the neutrino fluxes from the letter of intent of the Hyper-Kamiokande project [29] and the background from [9].…”

Section: Accelerator Experiments: T2k and Minosmentioning

confidence: 99%

“…For CC-NQE events, following the procedure described in the appendix of [5], a shift of 350 MeV was introduced in the Gaussian smearing function in order to take into account the significant difference between true and reconstructed neutrino energy. In reproducing the current T2K result we assumed 1.43 × 10 20 POT and 23% systematic uncertainly in the absolute normalization.…”

Section: Accelerator Experiments: T2k and Minosmentioning

confidence: 99%

“…It must be stressed that the experimental redundancy for measuring θ 13 may be justified because of the complementary nature of the two types of experiments, as discussed, for example, in [3,5]. While the reactor experiments provide a clean measurement of θ 13 which is free from degeneracy [6][7][8], the accelerator measurement can enjoy the interplay with the CP phase δ CP , which connotes the possibility of extension of the experiment to an upgraded phase to search for CP violation.…”

Section: Introductionmentioning

confidence: 99%

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Combining accelerator and reactor measurements of θ 13: the first result

Machado

Minakata

Nunokawa

et al. 2012

J. High Energ. Phys.

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Abstract:The lepton mixing angle θ 13 , the only unknown angle in the standard threeflavor neutrino mixing scheme, is finally measured by the recent reactor and accelerator neutrino experiments. We perform a combined analysis of the data coming from T2K, MINOS, Double Chooz, Daya Bay and RENO experiments and find sin 2 2θ 13 = 0.096 ± 0.013(±0.040) at 1 σ (3 σ) CL and that the hypothesis θ 13 = 0 is now rejected at a significance level of 7.7 σ. We also discuss the near future expectation on the precision of the θ 13 determination by using expected data from these ongoing experiments.

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Section: Accelerator Experiments: T2k and Minosmentioning

confidence: 99%

Section: Accelerator Experiments: T2k and Minosmentioning

confidence: 99%

Section: Accelerator Experiments: T2k and Minosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Combining accelerator and reactor measurements of θ 13: the first result

Machado

Minakata

Nunokawa

et al. 2012

J. High Energ. Phys.

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“…Let us first discuss the possibility to resolve this degeneracy by combining accelerator and reactor neutrinos [1], based on the suggestion in [10]. As a concrete example, we consider the second phase of the T2K experiment [3] with upgraded beam power of 4 MW and Hyper-Kamiokande (HK) detector, and high statistics second generation reactor experiment, e.g.…”

Section: Combining Accelerator and Reactormentioning

confidence: 99%

Resolving the octant degeneracy by neutrino oscillation experiments

Nunokawa

2007

Nuclear Physics B - Proceedings Supplements

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A close look on 2-3 mixing angle with DUNE in light of current neutrino oscillation data

Agarwalla

Kundu

Prakash

et al. 2022

J. High Energ. Phys.

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Recent global fit analyses of 3ν oscillation data show a preference for normal mass ordering (NMO) at 2.5σ and provide 1.6σ indications for lower θ23 octant (sin2θ23< 0.5) and leptonic CP violation (sin δCP< 0). In this work, we study in detail the capabilities of DUNE to establish the deviation from maximal θ23 and to resolve its octant in light of the current data. Introducing for the first time, a bi-events plot in the plane of total ν and $$ \overline{\nu} $$ ν ¯ disappearance events, we discuss the impact of sin2θ23 – ∆$$ {m}_{31}^2 $$ m 31 2 degeneracy in establishing non-maximal θ23 and show how this degeneracy can be resolved with the help of spectral analysis. A 3σ (5σ) determination of non-maximal θ23 is possible in DUNE with an exposure of 336 kt·MW·years if the true value of sin2θ23 ≲ 0.465 (0.450) or sin2θ23 ≳ 0.554 (0.572). We study the role of appearance and disappearance channels, systematic uncertainties, marginalization over oscillation parameters, and the importance of spectral analysis in establishing non-maximal θ23. We observe that both ν and $$ \overline{\nu} $$ ν ¯ data are essential to settle the θ23 octant at a high confidence level. DUNE can resolve the octant of θ23 at 4.2σ (5σ) using 336 (480) kt·MW·years of exposure for the present best-fit values of oscillation parameters. DUNE can improve the current relative 1σ precision on sin2θ23 (∆$$ {m}_{31}^2 $$ m 31 2 ) by a factor of 4.4 (2.8) using 336 kt·MW·years of exposure.

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Resolvingθ23degeneracy by accelerator and reactor neutrino oscillation experiments

Cited by 52 publications

References 84 publications

Combining accelerator and reactor measurements of θ 13: the first result

Combining accelerator and reactor measurements of θ 13: the first result

Resolving the octant degeneracy by neutrino oscillation experiments

A close look on 2-3 mixing angle with DUNE in light of current neutrino oscillation data

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