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${}^2$.

8 pages, 4 figures

References in corpus (8)

• The Reactor Antineutrino Anomaly
• Measurement of the solar neutrino capture rate with gallium metal. III: Results for the 2002--2007 data-taking period
• Final Results of GERDA on the Search for Neutrinoless Double-$\beta$ Decay
• Light Sterile Neutrinos: Models and Phenomenology
• Focal-plane detector system for the KATRIN experiment
• The gallium anomaly revisited
• Detecting sterile neutrinos with KATRIN like experiments
• KATRIN Sensitivity to Sterile Neutrino Mass in the Shadow of Lightest Neutrino Mass

Cited by in corpus (23)

• Sterile Neutrinos
• Results from the Baksan Experiment on Sterile Transitions (BEST)
• Direct Measurements of Neutrino Mass
• A Search for Electron Neutrino Transitions to Sterile States in the BEST Experiment
• Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor
• Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data
• Analysis methods for the first KATRIN neutrino-mass measurement
• Large Extra Dimensions and neutrino experiments
• Improved eV-scale Sterile-Neutrino Constraints from the Second KATRIN Measurement Campaign
• BEST Impact on Sterile Neutrino Hypothesis
• KATRIN: Status and Prospects for the Neutrino Mass and Beyond
• Cosmology-friendly time-varying neutrino masses via the sterile neutrino portal
• Two sides of the same coin: sterile neutrinos and dark radiation. Status and perspectives
• PROSPECT-II Physics Opportunities
• Review of sterile neutrino searches at very short-baseline reactor experiments
• The Result of the Neutrino-4 Experiment and the Cosmological Constraints on the Sterile Neutrino
• Future searches for light sterile neutrinos at nuclear reactors
• Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors
• Light Sterile Neutrinos
• New Physics searches in a low threshold scintillating argon bubble chamber measuring coherent elastic neutrino-nucleus scattering in reactors
• Restricting Sterile Neutrinos by Neutrinoless Double Beta Decay
• Status and Perspectives of Neutrino Physics
• New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs