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Bound on 3+1 active-sterile neutrino mixing from the first four-week science run of KATRIN
- Source :
- Phys. Rev. Lett. 126, 091803 (2021)
- Publication Year :
- 2020
-
Abstract
- We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in~2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino of mass $m_{4}$. The analysis is sensitive to a fourth mass state $m^2_{4} \lesssim$ 1000 eV$^2$ and to active-to-sterile neutrino mixing down to $|U_{e4}|^2 \gtrsim 2\cdot10^{-2}$. No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results and improve the Troitsk bound for $m^2_{4} <$ 30 eV$^2$. The reactor and gallium anomalies are constrained for $ 100 < \Delta{m}^2_{41} < 1000$ eV$^2$.<br />Comment: 8 pages, 4 figures
- Subjects :
- High Energy Physics - Experiment
Nuclear Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 126, 091803 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2011.05087
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.126.091803