Abstract

Reactor and accelerator-based neutrino experiments have played a critical role in the understanding of neutrino oscillations and are currently dominating the high-precision measurements of neutrino oscillation parameters. The discovery of a non-zero θ13 by the reactor experiments has opened the possibility of observing CP violation in the lepton sector by long-baseline accelerator experiments. The current knowledge of the neutrino oscillation parameters will be expanded upon in the near future through more precise measurements, including the discovery of the neutrino mass ordering and the CP-violating phase. This review summarizes the distinct and complementary approach of reactor and accelerator-based neutrino experiments to measure neutrino oscillations. The main scientific achievements of the Double Chooz reactor neutrino experiment and the science program to be developed by the DUNE long-baseline neutrino experiment with the world’s most intense neutrino beam are presented in this article. Spain has strongly contributed to these results and will continue to play a prominent role in the neutrino oscillation program in the coming years.

Highlights

  • Neutrino physics is one of the fundamental areas in particle physics, with a big impact on astroparticle physics and cosmology, which is still to be explored

  • In this article we review the role of reactor and accelerator neutrino experiments in the determination of the neutrino oscillation parameters

  • The study of the oscillation patterns of high-intensity νμ and νμ beams over a baseline of ∼1300 km in Deep Underground Neutrino Experiment (DUNE) will permit a detailed study of neutrino mixing, definitive resolution of the neutrino mass ordering, and a sensitive search for charge-parity symmetry violation (CPV) in the lepton sector in a single experiment [39]

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Summary

Introduction

Neutrino physics is one of the fundamental areas in particle physics, with a big impact on astroparticle physics and cosmology, which is still to be explored. Great improvements in the experimental field have contributed to understand the neutrino oscillation phenomenon This is only possible if neutrinos are massive, which is the first indication of new physics beyond the standard model of particle physics. Reactor, atmospheric and accelerator neutrino experiments have measured with precision the three mixing angles θ23, θ12 and θ13 and the mass differences |∆m232| and ∆m221. Short-baseline reactor and accelerator neutrino experiments are of huge importance in the era of neutrino oscillation precision measurements. The precise determination of θ23, and the measurements of δCP and neutrino mass ordering by long-baseline accelerator experiments could provide insight into models behind neutrino mass and lepton mixing. The very precise reactor determination of θ13 can result on an improvement of the accelerator experiments sensitivity to δCP. The main results and contributions of Spain to these projects are summarized

Reactor Neutrino Experiments
Double Chooz
The Measurement of the θ13 Mixing Angle
Spanish Contribution to Double Chooz
Long-Baseline Neutrino Experiments
The DUNE Experiment
Long-Baseline Neutrino Oscillation Physics in DUNE
Spanish Contribution to DUNE
Findings
Conclusions
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