Bound on 3+1 active-sterile neutrino mixing from the first four-week science run of KATRIN

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 $m_4^2\lesssim$ 1000 eV${}^2$ and to active-to-sterile neutrino mixing down to $|U_{e4}{|}^2\gtrsim 2\cdot 10^{-2}$. 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 $m_4^2<$ 30 eV${}^2$. The reactor and gallium anomalies are constrained for $100<\Delta m_{41}^2<1000$ eV${}^2$.

arXiv comment8 pages, 4 figures

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