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.
- Carney, R.
- Chilingaryan, S.
- Choi, W.
- Debowski, K.
- Descher, M.
- Diaz Barrero, D.
- Doe, P.
- Dragoun, O.
- Drexlin, G.
- Edzards, F.
- Eitel, K.
- Ellinger, E.
- Engel, R.
- Enomoto, S.
- Felden, A.
- Formaggio, J.
- Fraenkle, F.
- Franklin, G.
- Friedel, F.
- Fulst, A.
- Gauda, K.
- Gavin, A.
- 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.
- Lebeda, O.
- Lehnert, B.
- Lokhov, A.
- Machatschek, M.
- Malcherek, E.
- Mark, M.
- Marsteller, A.
- Martin, E.
- Melzer, C.
- Mertens, S.
- Mostafa, J.
- Muller, K.
- Neumann, H.
- Niemes, S.
- Oelpmann, P.
- Parno, D.
- Poon, A.
- Poyato, J.
- Priester, F.
- Ralis, J.
- Ramachandran, S.
- Robertson, R.
- 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.
- Thorne, L.
- Thummler, T.
- Titov, N.
- Tkachev, I.
- Urban, K.
- Valerius, K.
- Venos, D.
- Hernandez, A.
- Weinheimer, C.
- Welte, S.
- Wendel, J.
- Wetter, M.
- Wiesinger, C.
- Wilkerson, J.
- Wolf, J.
- Wuestling, S.
- Wydra, J.
- Xu, W.
- Zadoroghny, S.
- Zeller, G.
DOIAbstract
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 Troit...
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