@article{46526d710ea44b579c1f70baa2fca3a2,
title = "Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN",
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) eV2. 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.",
author = "{KATRIN Collaboration} and M. Aker and K. Altenm{\"u}ller and M. Arenz and M. Babutzka and J. Barrett and S. Bauer and M. Beck and A. Beglarian and J. Behrens and T. Bergmann and U. Besserer and K. Blaum and F. Block and S. Bobien and K. Bokeloh and J. Bonn and B. Bornschein and L. Bornschein and H. Bouquet and T. Brunst and Caldwell, {T. S.} and {La Cascio}, L. and S. Chilingaryan and W. Choi and Corona, {T. J.} and K. Debowski and M. Deffert and M. Descher and Doe, {P. J.} and O. Dragoun and G. Drexlin and Dunmore, {J. A.} and S. Dyba and F. Edzards and L. Eisenbl{\"a}tter and K. Eitel and E. Ellinger and R. Engel and S. Enomoto and M. Erhard and D. Eversheim and M. Fedkevych and A. Felden and S. Fischer and B. Flatt and Formaggio, {J. A.} and Fr{\"a}nkle, {F. M.} and Franklin, {G. B.} and H. Frankrone and S. Mertens",
note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society.",
year = "2019",
month = nov,
day = "25",
doi = "10.1103/PhysRevLett.123.221802",
language = "English",
volume = "123",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "22",
}