KATRIN bound on 3+1 active-sterile neutrino mixing and the reactor antineutrino anomaly
Abstract
We present the bounds on 3+1 active-sterile neutrino mixing obtained from the first results of the KATRIN experiment. We show that the KATRIN data extend the Mainz and Troitsk bound to smaller values of Δ m412 for large mixing and improves the exclusion of the large-Δ m412 solution of the Huber-Muller reactor antineutrino anomaly. We also show that the combined bound of the Mainz, Troitsk, and KATRIN tritium experiments and the Bugey-3, NEOS, PROSPECT, and DANSS reactor spectral ratio measurements exclude most of the region in the (sin22ϑee,Δ m412) plane allowed by the Huber-Muller reactor antineutrino anomaly. Considering two new calculations of the reactor antineutrino fluxes, we show that one, that predicts a lower 235U antineutrino flux, is in agreement with the tritium and reactor spectral ratio measurements, whereas the other leads to a larger tension than the Huber-Muller prediction. We also show that the combined reactor spectral ratio and tritium measurements disfavor the Neutrino-4 indication of large active-sterile mixing. We finally discuss the constraints on the gallium neutrino anomaly.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- May 2020
- DOI:
- 10.1007/JHEP05(2020)061
- arXiv:
- arXiv:1912.12956
- Bibcode:
- 2020JHEP...05..061G
- Keywords:
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- Neutrino Physics;
- Beyond Standard Model;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 10 pages