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arXiv:1909.06048hep-ex

An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN

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

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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.

arXiv comments
Journal reference
Phys. Rev. Lett. 123, 221802 (2019)
DOI
doi:10.1103/PhysRevLett.123.221802
Subjects
hep-exHigh Energy Physics, Experiment astro-ph.COCosmology and Nongalactic Astrophysics nucl-exNuclear Experiment physics.ins-detInstrumentation and Detectors

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