Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by 
KATRIN

KATRIN Collaboration; Aker, M.; Altenmüller, K.; Arenz, M.; Babutzka, M.; Barrett, J.; Bauer, S.; Beck, M.; Beglarian, A.; Behrens, J.; Bergmann, T.; Besserer, U.; Blaum, K.; Block, F.; Bobien, S.; Bokeloh, K.; Bonn, J.; Bornschein, B.; Bornschein, L.; Bouquet, H.; Brunst, T.; Caldwell, T. S.; La Cascio, L.; Chilingaryan, S.; Choi, W.; Corona, T. J.; Debowski, K.; Deffert, M.; Descher, M.; Doe, P. J.; Dragoun, O.; Drexlin, G.; Dunmore, J. A.; Dyba, S.; Edzards, F.; Eisenblätter, L.; Eitel, K.; Ellinger, E.; Engel, R.; Enomoto, S.; Erhard, M.; Eversheim, D.; Fedkevych, M.; Felden, A.; Fischer, S.; Flatt, B.; Formaggio, J. A.; Fränkle, F. M.; Franklin, G. B.; Frankrone, H.; Friedel, F.; Fuchs, D.; Fulst, A.; Furse, D.; Gauda, K.; Gemmeke, H.; Gil, W.; Glück, F.; Görhardt, S.; Groh, S.; Grohmann, S.; Grössle, R.; Gumbsheimer, R.; HaMinh, M.; Hackenjos, M.; Hannen, V.; Harms, F.; Hartmann, J.; Haußmann, N.; Heizmann, F.; Helbing, K.; Hickford, S.; Hilk, D.; Hillen, B.; Hillesheimer, D.; Hinz, D.; Höhn, T.; Holzapfel, B.; Holzmann, S.; Houdy, T.; Howe, M. A.; Huber, A.; Jansen, A.; Kaboth, A.; Karl, C.; Kazachenko, O.; Kellerer, J.; Kernert, N.; Kippenbrock, L.; Kleesiek, M.; Klein, M.; Köhler, C.; Köllenberger, L.; Kopmann, A.; Korzeczek, M.; Kosmider, A.; Kovalí, A.; Krasch, B.; Kraus, M.; Krause, H.; Kuckert, L.; Kuffner, B.; Kunka, N.; Lasserre, T.; Le, T. L.; Lebeda, O.; Leber, M.; Lehnert, B.; Letnev, J.; Leven, F.; Lichter, S.; Lobashev, V. M.; Lokhov, A.; Machatschek, M.; Malcherek, E.; Müller, K.; Mark, M.; Marsteller, A.; Martin, E. L.; Melzer, C.; Menshikov, A.; Mertens, S.; Minter, L. I.; Mirz, S.; Monreal, B.; Morales Guzman, P. I.; Müller, K.; Naumann, U.; Ndeke, W.; Neumann, H.; Niemes, S.; Noe, M.; Oblath, N. S.; Ortjohann, H. -W.; Osipowicz, A.; Ostrick, B.; Otten, E.; Parno, D. S.; Phillips, D. G.; Plischke, P.; Pollithy, A.; Poon, A. W. P.; Pouryamout, J.; Prall, M.; Priester, F.; Röllig, M.; Röttele, C.; Ranitzsch, P. C. -O.; Rest, O.; Rinderspacher, R.; Robertson, R. G. H.; Rodenbeck, C.; Rohr, P.; Roll, Ch.; Rupp, S.; Rysavy, M.; Sack, R.; Saenz, A.; Schäfer, P.; Schimpf, L.; Schlösser, K.; Schlösser, M.; Schlüter, L.; Schön, H.; Schönung, K.; Schrank, M.; Schulz, B.; Schwarz, J.; Seitz-Moskaliuk, H.; Seller, W.; Sibille, V.; Siegmann, D.; Skasyrskaya, A.; Slezak, M.; Spalek, A.; Spanier, F.; Steidl, M.; Steinbrink, N.; Sturm, M.; Suesser, M.; Sun, M.; Tcherniakhovski, D.; Telle, H. H.; Thümmler, T.; Thorne, L. A.; Titov, N.; Tkachev, I.; Trost, N.; Urban, K.; Venos, D.; Valerius, K.; VanDevender, B. A.; Vianden, R.; Vizcaya Hernandez, A. P.; Wall, B. L.; Wüstling, S.; Weber, M.; Weinheimer, C.; Weiss, C.; Welte, S.; Wendel, J.; Wierman, K. J.; Wilkerson, J. F.; Wolf, J.; Xu, W.; Yen, Y. -R.; Zacher, M.; Zadorozhny, S.; Zboril, M.; Zeller, G.

doi:10.1103/PhysRevLett.123.221802

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Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN

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

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

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Citation

KATRIN Collaboration, Aker, M., Altenmüller, K., Arenz, M., Babutzka, M., Barrett, J., et al. (2019). Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN. Physical Review Letters, 123(22): 221802. doi:10.1103/PhysRevLett.123.221802.

Cite as: https://hdl.handle.net/21.11116/0000-0005-4439-F

Abstract

We report on the neutrino mass measurement result from the first four-week
science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019.
Beta-decay electrons from a high-purity gaseous molecular tritium source are
energy analyzed by a high-resolution MAC-E filter. A fit of the integrated
electron spectrum over a narrow interval around the kinematic endpoint at 18.57
keV gives an effective neutrino mass square value of $(-1.0^{+0.9}_{-1.1})$
eV$^2$. From this we derive an upper limit of 1.1 eV (90$\%$ confidence level)
on the absolute mass scale of neutrinos. This value coincides with the KATRIN
sensitivity. It improves upon previous mass limits from kinematic measurements
by almost a factor of two and provides model-independent input to cosmological
studies of structure formation.