Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign
Entity
UAM. Departamento de Química Física AplicadaPublisher
American Physical SocietyDate
2022-04-19Citation
10.1103/PhysRevD.105.072004
Physical Review D 105.7 (2022): 072004
ISSN
2470-0010 (print); 2470-0029 (online)DOI
10.1103/PhysRevD.105.072004Project
info:eu-repo/grantAgreement/EC/H2020/852845/ERC//SENSEEditor's Version
https://doi.org/10.1103/PhysRevD.105.072004Subjects
Antineutrinos; Neutrino Oscillations; Reactor; QuímicaNote
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMRights
© 2022 authorsAbstract
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 m42 ≲ 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 m42 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 Δm412 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 Δm412 are mostly excluded by short-baseline reactor experiments, KATRIN is the only ongoing laboratory experiment to be sensitive to relevant solutions at large Δm412 through a robust spectral shape analysis
Files in this item
Google Scholar:Aker, M.
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KATRIN Collaboration
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Díaz Barreiro, D.
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López Poyato, J. Manuel
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Telle, Helmut H.
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