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Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign

KATRIN Collaboration; Aker, M. 1; Batzler, D. 1; Beglarian, A. 2; Behrens, J. 1; Berlev, A.; Besserer, U. 1; Bieringer, B.; Block, F. 3; Bobien, S. 4; Bornschein, B. 1; Bornschein, L. 1; Böttcher, M.; Brunst, T.; Caldwell, T. S.; Carney, R. M. D.; Chilingaryan, S. ORCID iD icon 2; Choi, W. 3; Debowski, K.; ... mehr

Abstract:

We present the results of the light sterile neutrino search from the second Karlsruhe Tritium Neutrino (KATRIN) measurement campaign in 2019. Approaching nominal activity, 3.76×106 tritium β-electrons are analyzed in an energy window extending down to 40 eV below the tritium end point at E0=18.57  keV. We consider the 3ν+1 framework with three active and one sterile neutrino flavors. The analysis is sensitive to a fourth mass eigenstate m24≲1600  eV2 and active-to-sterile mixing |Ue4|2≳6×10−3. As no sterile-neutrino signal was observed, we provide improved exclusion contours on m24 and |Ue4|2 at 95% C.L. Our results supersede the limits from the Mainz and Troitsk experiments. Furthermore, we are able to exclude the large Δm241 solutions of the reactor antineutrino and gallium anomalies to a great extent. The latter has recently been reaffirmed by the BEST Collaboration and could be explained by a sterile neutrino with large mixing. While the remaining solutions at small Δm241 are mostly excluded by short-baseline reactor experiments, KATRIN is the only ongoing laboratory experiment to be sensitive to relevant solutions at large Δm241 through a robust spectral shape analysis.


Verlagsausgabe §
DOI: 10.5445/IR/1000146322
Veröffentlicht am 13.05.2022
Originalveröffentlichung
DOI: 10.1103/PhysRevD.105.072004
Scopus
Zitationen: 27
Web of Science
Zitationen: 21
Dimensions
Zitationen: 22
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 04.2022
Sprache Englisch
Identifikator ISSN: 2470-0010, 2470-0029
KITopen-ID: 1000146322
HGF-Programm 51.13.01 (POF IV, LK 01) Neutrinophysik und Dunkle Materie
Erschienen in Physical Review D
Verlag American Physical Society (APS)
Band 105
Heft 7
Seiten Art.-Nr.: 072004
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 19.04.2022
Nachgewiesen in Scopus
Web of Science
Dimensions
arXiv
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