Improved eV-scale sterile-neutrino constraints from the second KATRIN 
measurement campaign

Aker, M.; Batzler, D.; Beglarian, A.; Behrens, J.; Berlev, A.; Besserer, U.; Bieringer, B.; Block, F.; Bobien, S.; Bornschein, B.; Bornschein, L.; Bottcher, M.; Brunst, T.; Caldwell, T. S.; Carney, R. M. D.; Chilingaryan, S.; Choi, W.; Debowski, K.; Descher, M.; Diaz Barrero, D.; Doe, P. J.; Dragoun, O.; Drexlin, G.; Edzards, F.; Eitel, K.; Ellinger, E.; Engel, R.; Enomoto, S.; Felden, A.; Formaggio, J. A.; Fraenkle, F. M.; Franklin, G. B.; Friedel, F.; Fulst, A.; Gauda, K.; Gavin, A. S.; Gil, W.; Glueck, F.; Groessle, R.; Gumbsheimer, R.; Hannen, V; Haussmann, N.; Helbing, K.; Hickford, S.; Hiller, R.; Hillesheimer, D.; Hinz, D.; Hoehn, T.; Houdy, T.; Huber, A.; Jansen, A.; Karl, C.; Kellerer, J.; Kleifges, M.; Klein, M.; Koehler, C.; Koellenberger, L.; Kopmann, A.; Korzeczek, M.; Kovalik, A.; Krasch, B.; Krause, H.; La Cascio, L.; Lasserre, T.; Le, T. L.; Lebeda, O.; Lehnert, B.; Lokhov, A.; Machatschek, M.; Malcherek, E.; Mark, M.; Marsteller, A.; Martin, E. L.; Melzer, C.; Mertens, S.; Mostafa, J.; Muller, K.; Neumann, H.; Niemes, S.; Oelpmann, P.; Parno, D. S.; Poon, A. W. P.; Poyato, J. M. L.; Priester, F.; Ralis, J.; Ramachandran, S.; Robertson, R. G. H.; Rodejohann, W.; Rodenbeck, C.; Rollig, M.; Roettele, C.; Rysavy, M.; Sack, R.; Saenz, A.; Salomon, R.; Schafer, P.; Schimpf, L.; Schloesser, M.; Schloesser, K.; Schlueter, L.; Schneidewind, S.; Schrank, M.; Schwemmer, A.; Sibille, V; Siegmann, D.; Slezak, M.; Spanier, F.; Steidl, M.; Sturm, M.; Telle, H. H.; Thorne, L. A.; Thummler, T.; Titov, N.; Tkachev, I; Urban, K.; Valerius, K.; Venos, D.; Hernandez, A. P. Vizcaya; Weinheimer, C.; Welte, S.; Wendel, J.; Wetter, M.; Wiesinger, C.; Wilkerson, J. F.; Wolf, J.; Wuestling, S.; Wydra, J.; Xu, W.; Zadoroghny, S.; Zeller, G.

doi:10.1103/PhysRevD.105.072004

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Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign

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Rodejohann, W.
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Aker, M., Batzler, D., Beglarian, A., Behrens, J., Berlev, A., Besserer, U., et al. (2022). Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign. Physical Review D, 105(7): 072004. doi:10.1103/PhysRevD.105.072004.

Cite as: https://hdl.handle.net/21.11116/0000-000A-E4D3-6

Abstract

We present the results of the light sterile neutrino search from the second Karlsruhe Tritium Neutrino (KATRIN) measurement campaign in 2019. Approaching nominal activity, 3.76 x 10(6) tritium ss-electrons are analyzed in an energy window extending down to 40 eV below the tritium end point at E-0 = 18.57 keV. We consider the 3 nu + 1 framework with three active and one sterile neutrino flavors. The analysis is sensitive to a fourth mass eigenstate m(4)(2) less than or similar to 1600 eV(2) and active-to-sterile mixing |U-e4|(2) greater than or similar to 6 x 10(-3). As no sterile-neutrino signal was observed, we provide improved exclusion contours on m(4)(2) and |U-e4|(2) at 95% C.L. Our results supersede the limits from the Mainz and Troitsk experiments. Furthermore, we are able to exclude the large Delta m(41)(2) solutions of the reactor antineutrino and gallium anomalies to a great extent. The latter has recently been reaffirmed by the BEST Collaboration and could be explained by a sterile neutrino with large mixing. While the remaining solutions at small Delta m(41)(2) are mostly excluded by short-baseline reactor experiments, KATRIN is the only ongoing laboratory experiment to be sensitive to relevant solutions at large Delta m(41)(2) through a robust spectral shape analysis.