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Author  |
KM3NeT Collaboration (Adriani, O. et al); Alves Garre, S.; Bariego-Quintana, A.; Burriel, I.; Calvo, D.; Cecchini, V.; Garcia Soto, A.; Gozzini, S.R.; Hernandez-Rey, J.J.; Jaimes, R.; Lazo, A.; Lessing, N.; Madarapu, S.; Palacios Gonzalez, J.; Prado, J.; Real, D.; Saina, A.; Salesa Greus, F.; Sanchez Losa, A.; Zornoza, J.D.; Zuñiga, J. |
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Title |
Search for an eV-scale sterile neutrino with the first six detection units of KM3NeT/ORCA |
Type |
Journal Article |
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Year |
2026 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
02 |
Issue |
2 |
Pages |
080 - 25pp |
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Keywords |
Neutrino Detectors and Telescopes (experiments); Oscillation; Beyond Standard Model |
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Abstract |
The existence of an eV-scale sterile neutrino has been proposed to explain several anomalous experimental results obtained over the course of the past 25 years. The first search for such a sterile neutrino conducted with data from KM3NeT/ORCA – a water Cherenkov neutrino telescope under construction at the bottom of the Mediterranean Sea – is reported in this paper. GeV-scale atmospheric neutrino oscillations are measured by reconstructing the energy and arrival direction of up-going neutrinos that have traversed the Earth. This study is based on a data sample containing 5828 neutrino candidates collected with 6 detection units (5% of the complete detector), corresponding to an exposure of 433 kton-years. From the expected effect of an eV-scale sterile neutrino on the first nu(mu) -> nu(tau) standard oscillation maximum, simultaneous constraints are put on the magnitude of the U-mu 4 and U-tau 4 mixing elements assuming triangle m(41 )(2)>= 1 eV(2). The results are compatible with the absence of mixing between active neutrinos and a sterile state, with |U-mu 4|(2) < 0.138 and |U-tau 4|(2) < 0.076 at a 90% confidence level. Such constraints are compatible with the results reported by other long-baseline experiments, and indicate that with KM3NeT/ORCA it is possible to bring crucial contributions to sterile neutrino searches in the coming years. |
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Address |
[Adriani, O.] Univ Firenze, Dipartimento Fis & Astron, Via Sansone 1, I-50019 Sesto Fiorentino, Italy, Email: baillysalins@lpsc.in2p3.fr |
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Publisher |
Springer |
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English |
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Notes |
WOS:001684257000001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7066 |
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