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ORCA sensitivity for ∆m 2 41 > 0.1 eV 2 , with 3 years of data taking, on the sterile mixing angles at 90% C.L. (a) and 99% C.L. (b) compared with the upper limits from other neutrino telescopes. Dashed lines correspond to analyses made by fixing δ 24 . Continuous lines for ORCA and ANTARES correspond to an analysis with δ 24 free. Since there is a degeneracy between δ 24 and mass ordering, upper limits from IceCube including IO are also shown which can be compared with the continuous lines from ORCA and ANTARES.
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... In the sterile neutrino analysis, we find that MicroBooNE's 3σ exclusion does not cover the entire 1σ preferred region by MiniBooNE. Our findings highlight the importance of running the full SBN program, and of complementing it with the worldwide efforts to search for light sterile neutrinos in reactor [56][57][58][59][60], radioactive source [39], accelerator [61][62][63][64], solar [44,65], and atmospheric neutrino [53,[66][67][68][69][70] experiments. Together, these experiments will have sufficient sensitivity to answer this decades-old puzzle once and for all. ...
A new generation of neutrino experiments is testing the anomalous excess of electron-like events observed in MiniBooNE. This is of huge importance for particle physics, astrophysics, and cosmology, not only because of the potential discovery of physics beyond the Standard Model, but also because the lessons we will learn about neutrino-nucleus interactions will be crucial for the worldwide neutrino program. MicroBooNE has recently released results that appear to disfavor several explanations of the MiniBooNE anomaly. Here, we show quantitatively that MicroBooNE results, while a promising start, unquestionably do not probe the full parameter space of sterile neutrino models hinted at by MiniBooNE and other data, nor do they probe the interpretation of the MiniBooNE excess in a model-independent way.
A bstract
KM3NeT/ORCA is a water Cherenkov neutrino detector under construction and anchored at the bottom of the Mediterranean Sea. The detector is designed to study oscillations of atmospheric neutrinos and determine the neutrino mass ordering. This paper focuses on an initial configuration of ORCA, referred to as ORCA6, which comprises six out of the foreseen 115 detection units of photo-sensors. A high-purity neutrino sample was extracted, corresponding to an exposure of 433 kton-years. The sample of 5828 neutrino candidates is analysed following a binned log-likelihood method in the reconstructed energy and cosine of the zenith angle. The atmospheric oscillation parameters are measured to be sin 2 θ 23 = 0.51 − 0.05 + 0.04 , and Δ m 31 2 = 2.18 − 0.35 + 0.25 × 10 − 3 eV 2 ∪ − 2.25 − 1.76 × 10 − 3 eV ² at 68% CL. The inverted neutrino mass ordering hypothesis is disfavoured with a p-value of 0.25.