학술논문
Bound on 3+1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN
Document Type
article
Author
Aker, M; Altenmüller, K; Beglarian, A; Behrens, J; Berlev, A; Besserer, U; Bieringer, B; Blaum, K; Block, F; Bornschein, B; Bornschein, L; Böttcher, M; Brunst, T; Caldwell, TS; La Cascio, L; Chilingaryan, S; Choi, W; Barrero, D Díaz; Debowski, K; Deffert, M; Descher, M; Doe, PJ; Dragoun, O; Drexlin, G; Dyba, S; Edzards, F; Eitel, K; Ellinger, E; Engel, R; Enomoto, S; Fedkevych, M; Felden, A; Formaggio, JA; Fränkle, FM; Franklin, GB; Friedel, F; Fulst, A; Gauda, K; Gil, W; Glück, F; Grössle, R; Gumbsheimer, R; Höhn, T; Hannen, V; Haußmann, N; Helbing, K; Hickford, S; Hiller, R; Hillesheimer, D; Hinz, D; Houdy, T; Huber, A; Jansen, A; Köllenberger, L; Karl, C; Kellerer, J; Kippenbrock, L; Klein, M; Kopmann, A; Korzeczek, M; Kovalík, A; Krasch, B; Krause, H; Lasserre, T; Le, TL; Lebeda, O; Le Guennic, N; Lehnert, B; Lokhov, A; Poyato, JM Lopez; Müller, K; Machatschek, M; Malcherek, E; Mark, M; Marsteller, A; Martin, EL; Melzer, C; Mertens, S; Niemes, S; Oelpmann, P; Osipowicz, A; Parno, DS; Poon, AWP; Priester, F; Röllig, M; Röttele, C; Rest, O; Robertson, RGH; Rodenbeck, C; Ryšavý, M; Sack, R; Saenz, A; Schaller, A; Schäfer, P; Schimpf, L; Schlösser, M; Schlösser, K; Schlüter, L; Schrank, M; Schulz, B
Source
Physical Review Letters. 126(9)
Subject
Language
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. The analysis is sensitive to the mass, m_{4}, of the fourth mass state for m_{4}^{2}≲1000 eV^{2} and to active-to-sterile neutrino mixing down to |U_{e4}|^{2}≳2×10^{-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 for m_{4}^{2}≲1000 eV^{2} and improve the Troitsk bound for m_{4}^{2}