Measuring the leptonic 
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 phase in neutrino oscillations with nonunitary mixing

Ge, Shao-Feng; Pasquini, Pedro; Tórtola, Mariam; Valle, J. W. F.

doi:10.1103/physrevd.95.033005

Cited by 51 publications

(35 citation statements)

References 50 publications

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“…Thus, the standard three-family oscillations explored at DUNE (and the other present and near-future oscillation facilities) will be free from the possible ambiguities that could otherwise be induced by this type of new physics [62][63][64][65]. While these bounds on nonunitarity are too strong for these effects to be probed at present and near-future facilities a Neutrino Factory [66,67] could be precise enough to explore these effects [24,29,68].…”

Section: Jhep04(2017)153mentioning

confidence: 99%

Non-unitarity, sterile neutrinos, and non-standard neutrino interactions

Blennow

Coloma

Fernández‐Martínez

et al. 2017

J. High Energ. Phys.

205

310

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Abstract:The simplest Standard Model extension to explain neutrino masses involves the addition of right-handed neutrinos. At some level, this extension will impact neutrino oscillation searches. In this work we explore the differences and similarities between the case in which these neutrinos are kinematically accessible (sterile neutrinos) or not (mixing matrix non-unitarity). We clarify apparent inconsistencies in the present literature when using different parametrizations to describe these effects and recast both limits in the popular neutrino non-standard interaction (NSI) formalism. We find that, in the limit in which sterile oscillations are averaged out at the near detector, their effects at the far detector coincide with non-unitarity at leading order, even in presence of a matter potential. We also summarize the present bounds existing in both limits and compare them with the expected sensitivities of near-future facilities taking the DUNE proposal as a benchmark. We conclude that non-unitarity effects are too constrained to impact present or near future neutrino oscillation facilities but that sterile neutrinos can play an important role at long baseline experiments. The role of the near detector is also discussed in detail.

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Section: Jhep04(2017)153mentioning

confidence: 99%

Non-unitarity, sterile neutrinos, and non-standard neutrino interactions

Blennow

Coloma

Fernández‐Martínez

et al. 2017

J. High Energ. Phys.

205

310

View full text Add to dashboard Cite

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“…This is in contrast with the determination of the CP violation, where the presence of sterile neutrinos could jeopardize the sensitivity [29,34,35].…”

Section: Discussionmentioning

confidence: 55%

Determination of the θ23 octant in long baseline neutrino experiments within and beyond the standard model

Das¹,

Pulido²,

Maalampi³

et al. 2018

Phys. Rev. D

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The recent data indicate that the neutrino mixing angle θ 23 deviates from the maximal-mixing value of 45°, showing two nearly degenerate solutions, one in the lower octant (LO) (θ 23 < 45°) and one in the higher octant (HO) (θ 23 > 45°). We investigate, using numerical simulations, the prospects for determining the octant of θ 23 in the future long baseline oscillation experiments. We present our results as contour plots on the (θ 23 − 45°, δ)-plane, where δ is the CP phase, showing the true values of θ 23 for which the octant can be experimentally determined at 3σ, 2σ and 1σ confidence level. In particular, we study the impact of the possible nonunitarity of neutrino mixing on the experimental determination of θ 23 in those experiments.

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“…[30] and used to determine a benchmark in Refs. [26][27][28][29], which takes into account experimental bounds on lepton flavor universality similar to Eqs. (18) and (23) Finally, we mention constraints from lepton flavor violating processes.…”

Section: Benchmark Modelmentioning

confidence: 99%

“…Such measurement is of practical importance when a hint of heavy neutrino mixing were discovered but were not conclusive. The mass hierarchy and δ C P measurement in the presence of heavy neutrino mixing has been investigated in a general context [25] and for the T2K, T2HK, NOνA and DUNE experiments [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Heavy neutrino mixing in the T2HK, the T2HKK and an extension of the T2HK with a detector at Oki Islands

et al. 2017

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We study the discovery potential for the mixing of heavy isospin-singlet neutrinos in extensions of the Tokai-to-Kamioka (T2K) experiment, the Tokai-to-HyperKamiokande (T2HK), the Tokai-to-Hyper-Kamiokande-toKorea (T2HKK) with a Korea detector with 1000 km baseline length and 1 • off-axis angle, and a plan of adding a small detector at Oki Islands to the T2HK. We further pursue the possibility of measuring the neutrino mass hierarchy and the standard C P-violating phase δ C P in the presence of heavy neutrino mixing by fitting data with the standard oscillation parameters only. We show that the sensitivity to heavy neutrino mixing is highly dependent on δ C P and new C Pviolating phases in the heavy neutrino mixing matrix, and deteriorates considerably when these phases conspire to suppress interference between the standard oscillation amplitude and an amplitude arising from heavy neutrino mixing, at the first oscillation peak. Although this suppression is avoided by the use of a beam with smaller off-axis angle, the T2HKK and the T2HK+small Oki detector do not show improvement over the T2HK. As for the mass hierarchy measurement, the wrong mass hierarchy is possibly favored in the T2HK because heavy neutrino mixing can mimic matter effects. In contrast, the T2HKK and the T2HK+small Oki detector are capable of correctly measuring the mass hierarchy despite heavy neutrino mixing, as measurements with different baselines resolve degeneracy between heavy neutrino mixing and matter effects. Notably, adding a small detector at Oki to the T2HK drastically ameliorates the sensitivity, which is the central appeal of this paper. As for the δ C P measurement, there can be a sizable discrepancy between the true δ C P and the value obtained by fitting data with the standard oscillation parameters only, which can be comparable to 1σ resolution Electronic supplementary material The online version of this article (https://doi.org/10.1140/epjc/s10052-017-5294-7) contains supplementary material, which is available to authorized users. a e-mail: toshifumi@riko.shimane-u.ac.jp of the δ C P measurement. Hence, if a hint of heavy neutrino mixing is discovered, it is necessary to incorporate the effects of heavy neutrino mixing to measure δ C P correctly.

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Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing

Cited by 51 publications

References 50 publications

Non-unitarity, sterile neutrinos, and non-standard neutrino interactions

Non-unitarity, sterile neutrinos, and non-standard neutrino interactions

Determination of the θ23 octant in long baseline neutrino experiments within and beyond the standard model

Heavy neutrino mixing in the T2HK, the T2HKK and an extension of the T2HK with a detector at Oki Islands

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