Bound on 3 + 1 Active-Sterile Neutrino Mixing from the First Four-Week Science 
Run of KATRIN

Aker, M.; Altenmueller, K.; Beglarian, A.; Behrens, J.; Berlev, A.; Besserer, U.; Bieringer, B.; Blaum, K.; Block, F.; Bornschein, B.; Bornschein, L.; Boettcher, M.; Brunst, T.; Caldwell, T. S.; La Cascio, L.; Chilingaryan, S.; Choi, W.; Barrero, D. Diaz; Debowski, K.; Deffert, M.; Descher, M.; Doe, P. J.; Dragoun, O.; Drexlin, G.; Dyba, S.; Edzards, F.; Eitel, K.; Ellinger, E.; Engel, R.; Enomoto, S.; Felden, M. Fedkevych A.; Formaggio, J. A.; Fraenkle, F. M.; Franklin, G. B.; Friedel, F.; Fulst, A.; Gauda, K.; Gil, W.; Glueck, F.; Groessle, R.; Gumbsheimer, R.; Hoehn, T.; Hannen, V.; Haussmann, N.; Helbing, K.; Hickford, S.; Hiller, R.; Hillesheimer, D.; Hinz, D.; Houdy, T.; Huber, A.; Jansen, A.; Koellenberger, L.; Karl, C.; Kellerer, J.; Kippenbrock, L.; Klein, M.; Kopmann, A.; Korzeczek, M.; Kovalik, A.; Krasch, B.; Krause, H.; Lasserre, T.; Le, T. L.; Lebeda, O.; Guennic, N. Le; Lehnert, B.; Lokhov, A.; Poyato, J. M. Lopez; Mueller, K.; Machatschek, M.; Malcherek, E.; Mark, M.; Marsteller, A.; Martin, E. L.; Melzer, C.; Mertens, S.; Niemes, S.; Oelpmann, P.; Osipowicz, A.; Parno, D. S.; Poon, A. W. P.; Priester, F.; Roellig, M.; Roettele, C.; Rest, O.; Robertson, R. G. H.; Rodenbeck, C.; Rysavy, M.; Sack, R.; Saenz, A.; Schaller, A.; Schaefer, P.; Schimpf, L.; Schloesser, M.; Schloesser, K.; Schlueter, L.; Schrank, M.; Schulz, B.; Sefcik, M.; Seitz-Moskaliuk, H.; Sibille, V.; Siegmann, D.; Slezak, M.; Spanier, F.; Steidl, M.; Sturm, M.; Sun, M.; Telle, H. H.; Thuemmler, T.; Thorne, L. A.; Titov, N.; Tkachev, I.; Trost, N.; Venos, D.; Valerius, K.; Hernandez, A. P. Vizcaya; Wuestling, S.; Weber, M.; Weinheimer, C.; Weiss, C.; Welte, S.; Wendel, J.; Wilkerson, J. F.; Wolf, J.; Xu, W.; Yen, Y. -R.; Zadoroghny, S.; Zeller, G.

doi:10.1103/PhysRevLett.126.091803

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Bound on 3 + 1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN

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Blaum, K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Aker, M., Altenmueller, K., Beglarian, A., Behrens, J., Berlev, A., Besserer, U., et al. (2021). Bound on 3 + 1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN. Physical Review Letters, 126(9): 091803. doi:10.1103/PhysRevLett.126.091803.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1A3E-7

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$^2$.