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23 April 2024

» arxiv » 2011.05087

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Bound on 3+1 active-sterile neutrino mixing from the first four-week science run of KATRIN
M. Aker ; K. Altenmueller ; A. Beglarian ; J. Behrens ; A. Berlev ; U. Besserer ; B. Bieringer ; K. Blaum ; F. Block ; B. Bornschein ; L. Bornschein ; M. Boettcher ; T. Brunst ; T. S. Caldwell ; L. La Cascio ; S. Chilingaryan ; W. Choi ; D. Diaz Barrero ; K. Debowski ; M. Deffert ; M. Descher ; P. J. Doe ; O. Dragoun ; G. Drexlin ; S. Dyba ; F. Edzards ; K. Eitel ; E. Ellinger ; R. Engel ; S. Enomoto ; M. Fedkevych A. Felden ; J. A. Formaggio ; F. M. Fraenkle ; G. B. Franklin ; F. Friedel ; A. Fulst ; K. Gauda ; W. Gil ; F. Glueck ; R. Groessle ; R. Gumbsheimer ; T. Hoehn ; V. Hannen ; N. Haussmann ; K. Helbing ; S. Hickford ; R. Hiller ; D. Hillesheimer ; D. Hinz ; T. Houdy ; A. Huber ; A. Jansen ; L. Koellenberger ; C. Karl ; J. Kellerer ; L. Kippenbrock ; M. Klein ; A. Kopmann ; M. Korzeczek ; A. Kovalik ; B. Krasch ; H. Krause ; T. Lasserre ; T. L. Le ; O. Lebeda ; N. Le Guennic ; B. Lehnert ; A. Lokhov ; J. M. Lopez Poyato ; K. Mueller ; M. Machatschek ; E. Malcherek ; M. Mark ; A. Marsteller ; E. L. Martin ; C. Melzer ; S. Mertens ; S. Niemes ; P. Oelpmann ; A. Osipowicz ; D. S. Parno ; A. W. P. Poon ; F. Priester ; M. Roellig ; C. Roettele ; O. Rest ; R. G. H. Robertson ; C. Rodenbeck ; M. Rysavy ; R. Sack ; A. Saenz ; A. Schaller ; P. Schaefer ; L. Schimpf ; M. Schloesser ; K. Schloesser ; L. Schlueter ; M. Schrank ; B. Schulz ; M. Sefcik ; H. Seitz-Moskaliuk ; V. Sibille ; D. Siegmann ; M. Slezak ; F. Spanier ; M. Steidl ; M. Sturm ; M. Sun ; H. H. Telle ; T. Thuemmler ; L. A. Thorne ; N. Titov ; I. Tkachev ; N. Trost ; D. Venos ; K. Valerius ; A. P. Vizcaya Hernandez ; S. Wuestling ; M. Weber ; C. Weinheimer ; C. Weiss ; S. Welte ; J. Wendel ; J. F. Wilkerson ; J. Wolf ; W. Xu ; Y.-R. Yen ; S. Zadoroghny ; G. Zeller ;
Date:	10 Nov 2020
Abstract:	We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in~2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino of mass $m_{4}$. The analysis is sensitive to a fourth mass state $m^2_{4} lesssim$ 1000 eV$^2$ and to active-to-sterile neutrino mixing down to $\|U_{e4}\|^2 gtrsim 2cdot10^{-2}$. No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results and improve the Troitsk bound for $m^2_{4} <$ 30 eV$^2$. The reactor and gallium anomalies are constrained for $ 100 < Delta{m}^2_{41} < 1000$ eV$^2$.
Source:	arXiv, 2011.05087
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