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Bound on 3+1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN

Aker, M.; Altenmüller, K.; Beglarian, A.; Behrens, J.; Berlev, A.; Besserer, U.; Bieringer, B.; Blaum, K.; Block, F.; Bornschein, B.; Bornschein, L.; Böttcher, M.; Brunst, T.; Caldwell, T. S.; La Cascio, L.; Chilingaryan, S.; Choi, W.; Díaz Barrero, D.; Debowski, K.; Deffert, M.; ... mehr

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. The analysis is sensitive to the mass, m$_{4}$ f the fourth mass state for m$_{4}$$^{2}$ ≲1000 eV$^{2}$ and to active-to-sterile neutrino mixing down to |U$_{e4}$|$^{2}$≳2×10$^{-2}$. No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results for m$_{4}$$^{2}$ ≲1000 eV$^{2}$ and improve the Troitsk bound for m$_{4}$$^{2}$< 30 eV$^{2}$. he reactor and gallium anomalies are constrained for 100<Δ m$_{41}$$^{2}$< 1000 eV$^{2}$.

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Verlagsausgabe §
DOI: 10.5445/IR/1000130796
Veröffentlicht am 24.03.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Astroteilchenphysik (IAP)
Projekt-, Prozess- und Qualitätsmanagement (PPQ)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen-ID: 1000130796
Erschienen in Physical Review Letters
Verlag American Physical Society (APS)
Band 126
Heft 9
Seiten Art.-Nr.: 091803
Nachgewiesen in Web of Science
Scopus
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