Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
Affiliations
- 1 Institute for Nuclear Physics (IKP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 2 Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 3 Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
- 4 IRFU (DPhP & APC), CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
- 5 Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany.
- 6 Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Nussallee 14-16, 53115 Bonn, Germany.
- 7 Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany.
- 8 Laboratory for Nuclear Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
- 9 Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9, 48149 Münster, Germany.
- 10 Institut für Physik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz, Germany.
- 11 Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 12 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
- 13 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
- 14 Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA.
- 15 Department of Physics, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany.
- 16 Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, Washington 98195, USA.
- 17 Nuclear Physics Institute of the CAS, v. v. i., CZ-250 68 Řež, Czech Republic.
- 18 Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
- 19 Institute for Nuclear Research of Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312 Moscow, Russia.
- 20 Institute for Nuclear and Particle Astrophysics and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
- 21 University of Applied Sciences (HFD) Fulda, Leipziger Straße 123, 36037 Fulda, Germany.
- 22 Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA.
- 23 Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany.
- 24 Departamento de Química Física Aplicada, Universidad Autonoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain.
- 25 Project, Process, and Quality Management (PPQ), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- PMID: 31868426
- DOI: 10.1103/PhysRevLett.123.221802
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
Authors
Affiliations
- 1 Institute for Nuclear Physics (IKP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 2 Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 3 Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
- 4 IRFU (DPhP & APC), CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
- 5 Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany.
- 6 Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Nussallee 14-16, 53115 Bonn, Germany.
- 7 Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany.
- 8 Laboratory for Nuclear Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
- 9 Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9, 48149 Münster, Germany.
- 10 Institut für Physik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz, Germany.
- 11 Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 12 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
- 13 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
- 14 Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA.
- 15 Department of Physics, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany.
- 16 Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, Washington 98195, USA.
- 17 Nuclear Physics Institute of the CAS, v. v. i., CZ-250 68 Řež, Czech Republic.
- 18 Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
- 19 Institute for Nuclear Research of Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312 Moscow, Russia.
- 20 Institute for Nuclear and Particle Astrophysics and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
- 21 University of Applied Sciences (HFD) Fulda, Leipziger Straße 123, 36037 Fulda, Germany.
- 22 Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA.
- 23 Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany.
- 24 Departamento de Química Física Aplicada, Universidad Autonoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain.
- 25 Project, Process, and Quality Management (PPQ), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- PMID: 31868426
- DOI: 10.1103/PhysRevLett.123.221802
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.