New oscillation and scattering constraints on the tau row matrix elements without assuming unitarity

Denton, Peter B.; Gehrlein, Julia

doi:10.1007/jhep06(2022)135

Cited by 12 publications

(6 citation statements)

References 90 publications

(198 reference statements)

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“…However, when new physics affects the oscillation probabilities, it has been shown in refs. [51,86,88,89] that the NUNM parameters α 33 and |α 32 | constraints can be improved even by the small number of ν τ events.…”

Section: Improvement Due To the ν τ Sample In Dunementioning

confidence: 99%

Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments

Agarwalla

Das

Giarnetti

et al. 2022

J. High Energ. Phys.

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Our knowledge on the active 3ν mixing angles (θ12, θ13, and θ23) and the CP phase δCP is becoming accurate day-by-day enabling us to test the unitarity of the leptonic mixing matrix with utmost precision. Future high-precision long-baseline experiments are going to play an important role in this direction. In this work, we study the impact of possible non-unitary neutrino mixing (NUNM) in the context of next-generation long-baseline experiments DUNE and T2HKK/JD+KD having one detector in Japan (T2HK/JD) and a second detector in Korea (KD). We estimate the sensitivities of these setups to place direct, model-independent, and competitive constraints on various NUNM parameters. We demonstrate the possible correlations between the NUNM parameters, θ23, and δCP. Our numerical results obtained using only far detector data and supported by simple approximate analytical expressions of the oscillation probabilities in matter, reveal that JD+KD has better sensitivities for |α21| and α22 as compared to DUNE, due to its larger statistics in the appearance channel and less systematic uncertainties in the disappearance channel, respectively. For |α31|, |α32|, and α33, DUNE gives better constraints as compared to JD+KD, due to its larger matter effect and wider neutrino energy spectrum. For α11, both DUNE and JD+KD give similar bounds. We also show how much the bounds on the NUNM parameters can be improved by combining the prospective data from DUNE and JD+KD setups. We find that due to zero-distance effects, the near detectors alone can also constrain α11, |α21|, and α22 in both these setups. Finally, we observe that the ντ appearance sample in DUNE can improve the constraints on |α32| and α33.

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Section: Improvement Due To the ν τ Sample In Dunementioning

confidence: 99%

Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments

Agarwalla

Das

Giarnetti

et al. 2022

J. High Energ. Phys.

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“…There are numerous new physics scenarios affecting neutrino oscillations [12,13] including neutrino decay , Lorentz invariance violation and CPT violation [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50], background dark matter fields [51][52][53][54][55][56][57][58][59][60][61][62][63][64], neutrino decoherence or wave-packet separation [65][66][67][68][69][70][71][72][73], unitary violation [74][75][76], non-standard neutrino interactions (NSI) [5,[77][78][79][80]…”

Section: New Physics Scenariosmentioning

confidence: 99%

How to identify different new neutrino oscillation physics scenarios at DUNE

Denton

Giarnetti

Meloni

2023

J. High Energ. Phys.

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Next generation neutrino oscillation experiments are expected to measure the remaining oscillation parameters with very good precision. They will have unprecedented capabilities to search for new physics that modify oscillations. DUNE, with its broad band beam, good particle identification, and relatively high energies will provide an excellent environment to search for new physics. If deviations from the standard three-flavor oscillation picture are seen however, it is crucial to know which new physics scenario is found so that it can be verified elsewhere and theoretically understood. We investigate several benchmark new physics scenarios by looking at existing long-baseline accelerator neutrino data from NOvA and T2K and determine at what sensitivity DUNE can differentiate among them. We consider sterile neutrinos and both vector and scalar non-standard neutrino interactions, all with new complex phases, the latter of which could conceivably provide absolute neutrino mass scale information. We find that, in many interesting cases, DUNE will have good model discrimination. We also perform a new fit to NOvA and T2K data with scalar NSI.

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“…Detecting the oscillated tau neutrinos, thus, is an additional confirmation of the theory of neutrino oscillations. These measurements of tau neutrino appearance help set bounds on the unitary of the 3 × 3 PMNS matrix which governs the neutrino oscillations, for which the tau neutrino row is the least constrained [5].…”

Section: Tau Neutrino Appearance At Super-kamiokandementioning

confidence: 99%

The Appearance of Tau Neutrinos in the Flux of Atmospheric Neutrinos at Super-Kamiokande

Mandal

2023

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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We present the latest results on the appearance of tau neutrinos from neutrino oscillations in the flux of atmospheric neutrinos recorded at Super-Kamiokande. The dataset is for a live-time of 6511.3 days recorded from 1996 to 2020, and accounts for all of the pure-water runs at Super-Kamiokande. The exposure of the detector is 484.2 kT-years. 428 ± 92 oscillated tau neutrino events have been observed. The measured tau neutrino normalisation is 1.36 ± 0.29. We exclude the hypothesis of no tau neutrino appearance with a significance of 4.8𝜎.

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New oscillation and scattering constraints on the tau row matrix elements without assuming unitarity

Cited by 12 publications

References 90 publications

Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments

Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments

How to identify different new neutrino oscillation physics scenarios at DUNE

The Appearance of Tau Neutrinos in the Flux of Atmospheric Neutrinos at Super-Kamiokande

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