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. 2019 Nov 29;123(22):221802.
doi: 10.1103/PhysRevLett.123.221802.

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

M Aker  1   2 K Altenmüller  3   4   5 M Arenz  6 M Babutzka  7 J Barrett  8 S Bauer  9 M Beck  9   10 A Beglarian  11 J Behrens  1   7   9 T Bergmann  3   11   5 U Besserer  1   2 K Blaum  12 F Block  7 S Bobien  2 K Bokeloh  9 J Bonn  10 B Bornschein  1   2 L Bornschein  1 H Bouquet  11 T Brunst  3   5 T S Caldwell  13   14 L La Cascio  7 S Chilingaryan  11 W Choi  7 T J Corona  8   13   14 K Debowski  7   15 M Deffert  7 M Descher  7 P J Doe  16 O Dragoun  17 G Drexlin  1   7 J A Dunmore  16 S Dyba  9 F Edzards  3   5 L Eisenblätter  11 K Eitel  1 E Ellinger  15 R Engel  1   7 S Enomoto  16 M Erhard  7 D Eversheim  6 M Fedkevych  9 A Felden  1 S Fischer  1   2 B Flatt  10 J A Formaggio  8 F M Fränkle  1   13   14 G B Franklin  18 H Frankrone  11 F Friedel  7 D Fuchs  3   5 A Fulst  9 D Furse  8 K Gauda  9 H Gemmeke  11 W Gil  1 F Glück  1 S Görhardt  1 S Groh  7 S Grohmann  2 R Grössle  1   2 R Gumbsheimer  1 M Ha Minh  3   5 M Hackenjos  1   2   7 V Hannen  9 F Harms  7 J Hartmann  11 N Haußmann  15 F Heizmann  7 K Helbing  15 S Hickford  1   15 D Hilk  7 B Hillen  9 D Hillesheimer  1   2 D Hinz  1 T Höhn  1 B Holzapfel  2 S Holzmann  2 T Houdy  3   5 M A Howe  13   14 A Huber  7 T M James  2 A Jansen  1 A Kaboth  8 C Karl  3   5 O Kazachenko  19 J Kellerer  7 N Kernert  1 L Kippenbrock  16 M Kleesiek  7 M Klein  1   7 C Köhler  3   5 L Köllenberger  1 A Kopmann  11 M Korzeczek  7 A Kosmider  1 A Kovalík  17 B Krasch  1   2 M Kraus  7 H Krause  1 L Kuckert  1 B Kuffner  1 N Kunka  11 T Lasserre  3   4   5 T L Le  1   2 O Lebeda  17 M Leber  16 B Lehnert  20 J Letnev  21 F Leven  7 S Lichter  1 V M Lobashev  19 A Lokhov  9   19 M Machatschek  7 E Malcherek  1 K Müller  1 M Mark  1 A Marsteller  1   2 E L Martin  13   14   16 C Melzer  1   2 A Menshikov  11 S Mertens  1   3   5   20 L I Minter  16 S Mirz  1   2 B Monreal  22 P I Morales Guzmán  3   5 K Müller  1 U Naumann  15 W Ndeke  23 H Neumann  2 S Niemes  1   2 M Noe  2 N S Oblath  8 H-W Ortjohann  9 A Osipowicz  21 B Ostrick  9 E Otten  10 D S Parno  16   18 D G Phillips  13   14 P Plischke  1 A Pollithy  3   5 A W P Poon  20 J Pouryamout  15 M Prall  9 F Priester  1   2 M Röllig  1   2 C Röttele  1   2   7 P C-O Ranitzsch  9 O Rest  9 R Rinderspacher  1 R G H Robertson  16 C Rodenbeck  9 P Rohr  11 Ch Roll  23 S Rupp  1   2   7 M Ryšavý  17 R Sack  9 A Saenz  23 P Schäfer  1   2 L Schimpf  7 K Schlösser  1 M Schlösser  1   2 L Schlüter  3   5 H Schön  2 K Schönung  1   2   12 M Schrank  1 B Schulz  23 J Schwarz  1 H Seitz-Moskaliuk  7 W Seller  21 V Sibille  8 D Siegmann  3   5 A Skasyrskaya  19 M Slezák  5   17 A Špalek  17 F Spanier  1 M Steidl  1 N Steinbrink  9 M Sturm  1   2 M Suesser  2 M Sun  16 D Tcherniakhovski  11 H H Telle  24 T Thümmler  1   9 L A Thorne  18 N Titov  19 I Tkachev  19 N Trost  1 K Urban  3   5 D Vénos  17 K Valerius  1   9 B A VanDevender  16 R Vianden  6 A P Vizcaya Hernández  18 B L Wall  16 S Wüstling  11 M Weber  11 C Weinheimer  9 C Weiss  25 S Welte  1   2 J Wendel  1   2 K J Wierman  13   14 J F Wilkerson  13   14 J Wolf  7 W Xu  8 Y-R Yen  18 M Zacher  9 S Zadorozhny  19 M Zbořil  9   17 G Zeller  1   2 KATRIN Collaboration
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Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN

M Aker et al. Phys Rev Lett. .
Free article

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 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 1.1 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 2 and provides model-independent input to cosmological studies of structure formation.

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