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, T M James, 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 Kovalík, 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 Guzmán, 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 Ryšavý, 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 Slezák, A Špalek, 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 Vénos, K Valerius, B A VanDevender, R Vianden, A P Vizcaya Hernández, 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 Zbořil, G Zeller
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 end point at 18.57 keV gives an effective neutrino mass square value of (-1.0_{-1.1}^{+0.9}) eV^{2}. From this, we derive an upper limit of 1...
November 29, 2019: Physical Review Letters