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Probing invisible neutrino decay with the first six detection units of KM3NeT/ORCA
The KM3NeT collaboration; Aiello, S.; Albert, A.; Alhebsi, A. R.; Alshamsi, M.; Alves Garre, S.; Ambrosone, A.; Ameli, F.; Andre, M.; Aphecetche, L.; Ardid, M.; Ardid, S.; Aublin, J.; Badaracco, F.; Bailly-Salins, L.; Bardačová, Z.; Baret, B.; Bariego-Quintana, A.; Becherini, Y.; Bendahman, M.; Benfenati Gualandi, F.; Benhassi, M.; Bennani, M.; Benoit, D. M.; Berbee, E.; Bertin, V.; Biagi, S.; Boettcher, M.; Bonanno, D.; Bouasla, A. B.; Boumaaza, J.; Bouta, M.; Bouwhuis, M.; Bozza, C.; Bozza, R. M.; Brânzaş, H.; Bretaudeau, F.; Breuhaus, M.; Bruijn, R.; Brunner, J.; Bruno, R.; Buis, E.; Buompane, R.; Busto, J.; Caiffi, B.; Calvo, D.; Capone, A.; Carenini, F.; Carretero, V.; Cartraud, T.; Castaldi, P.; Cecchini, V.; Celli, S.; Cerisy, L.; Chabab, M.; Chen, A.; Cherubini, S.; Chiarusi, T.; Circella, M.; Clark, R.; Cocimano, R.; Coelho, J. A. B.; Coleiro, A.; Condorelli, A.; Coniglione, R.; Coyle, P.; Creusot, A.; Cuttone, G.; Dallier, R.; De Benedittis, A.; De Wasseige, G.; Decoene, V.; Deguire, P.; Del Rosso, I.; Di Mauro, L. S.; Di Palma, I.; Díaz, A. F.; Diego-Tortosa, D.; Distefano, C.; Domi, A.; Donzaud, C.; Dornic, D.; Drakopoulou, E.; Drouhin, D.; Ducoin, J.-G.; Duverne, P.; Dvornický, R.; Eberl, T.; Eckerová, E.; Eddymaoui, A.; van Eeden, T.; Eff, M.; van Eijk, D.; El Bojaddaini, I.; El Hedri, S.; El Mentawi, S.; Ellajosyula, V.; Enzenhöfer, A.; Ferrara, G.; Filipović, M. D.; Filippini, F.; Franciotti, D.; Fusco, L. A.; Gagliardini, S.; Gal, T.; García Méndez, J.; Garcia Soto, A.; Gatius Oliver, C.; Geißelbrecht, N.; Genton, E.; Ghaddari, H.; Gialanella, L.; Gibson, B. K.; Giorgio, E.; Goos, I.; Goswami, P.; Gozzini, S. R.; Gracia, R.; Guidi, C.; Guillon, B.; Gutiérrez, M.; Haack, C.; van Haren, H.; Heijboer, A.; Hennig, L.; Hernández-Rey, J. J.; Idrissi, A.; Idrissi Ibnsalih, W.; Illuminati, G.; Joly, D.; de Jong, M.; de Jong, P.; Jung, B. J.; Kalaczyński, P.; Kikvadze, V.; Kistauri, G.; Kopper, C.; Kouchner, A.; Kovalev, Y. Y.; Krupa, L.; Kueviakoe, V.; Kulikovskiy, V.; Kvatadze, R.; Labalme, M.; Lahmann, R.; Lamoureux, M.; Larosa, G.; Lastoria, C.; Lazar, J.; Lazo, A.; Le Stum, S.; Lehaut, G.; Lemaître, V.; Leonora, E.; Lessing, N.; Levi, G.; Lindsey Clark, M.; Longhitano, F.; Magnani, F.; Majumdar, J.; Malerba, L.; Mamedov, F.; Manfreda, A.; Manousakis, A.; Marconi, M.; Margiotta, A.; Marinelli, A.; Markou, C.; Martin, L.; Mastrodicasa, M.; Mastroianni, S.; Mauro, J.; Mehta, K. C. K.; Meskar, A.; Miele, G.; Migliozzi, P.; Migneco, E.; Mitsou, M. L.; Mollo, C. M.; Morales-Gallegos, L.; Moussa, A.; Mozun Mateo, I.; Muller, R.; Musone, M. R.; Musumeci, M.; Navas, S.; Nayerhoda, A.; Nicolau, C. A.; Nkosi, B.; Fearraigh, B. Ó; Oliviero, V.; Orlando, A.; Oukacha, E.; Paesani, D.; Palacios González, J.; Papalashvili, G.; Parisi, V.; Parmar, A.; Pastor Gomez, E. J.; Pastore, C.; Păun, A. M.; Păvălaş, G. E.; Peña Martínez, S.; Perrin-Terrin, M.; Pestel, V.; Pestes, R.; Piattelli, P.; Plavin, A.; Poirè, C.; Popa, V.; Pradier, T.; Prado, J.; Pulvirenti, S.; Quiroz-Rangel, C. A.; Randazzo, N.; Ratnani, A.; Razzaque, S.; Rea, I. C.; Real, D.; Riccobene, G.; Romanov, A.; Ros, E.; Šaina, A.; Salesa Greus, F.; Samtleben, D. F. E.; Sánchez Losa, A.; Sanfilippo, S.; Sanguineti, M.; Santonocito, D.; Sapienza, P.; Scarnera, M.; Schnabel, J.; Schumann, J.; Schutte, H. M.; Seneca, J.; Sennan, N.; Sevle, P.; Sgura, I.; Shanidze, R.; Sharma, A.; Shitov, Y.; Šimkovic, F.; Simonelli, A.; Sinopoulou, A.; Spisso, B.; Spurio, M.; Stavropoulos, D.; Štekl, I.; Taiuti, M.; Takadze, G.; Tayalati, Y.; Thiersen, H.; Thoudam, S.; Tosta, I.; Melo; Trocmé, B.; Tsourapis, V.; Tudorache, A.; Tzamariudaki, E.; Ukleja, A.; Vacheret, A.; Valsecchi, V.; Van Elewyck, V.; Vannoye, G.; Vasileiadis, G.; Vazquez de Sola, F.; Veutro, A.; Viola, S.; Vivolo, D.; van Vliet, A.; de Wolf, E.; Lhenry-Yvon, I.; Zavatarelli, S.; Zegarelli, A.; Zito, D.; Zornoza, J. D.; Zúñiga, J.; Zywucka, N. (2025). Probing invisible neutrino decay with the first six detection units
In: Journal of High Energy Physics. Springer: New York. ISSN 1029-8479; e-ISSN 1029-8479, more
Peer reviewed article  

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Author keywords
    Beyond Standard Model; Neutrino Detectors and Telescopes (experiments); Oscillation

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  • van Haren, H., more

Abstract
    n the era of precision measurements of neutrino oscillation parameters, it is necessary for experiments to disentangle discrepancies that may indicate physics beyond the Standard Model in the neutrino sector. KM3NeT/ORCA is a water Cherenkov neutrino detector under construction and anchored at the bottom of the Mediterranean Sea. The detector is designed to study the oscillations of atmospheric neutrinos and determine the neutrino mass ordering. This paper focuses on the initial configuration of ORCA, referred to as ORCA6, which comprises six out of the foreseen 115 detection units of photosensors. A high-purity neutrino sample was extracted during 2020 and 2021, corresponding to an exposure of 433 kton-years. This sample is analysed following a binned log-likelihood approach to search for invisible neutrino decay, in a three-flavour neutrino oscillation scenario, where the third neutrino mass state ν3 decays into an invisible state, e.g. a sterile neutrino. The resulting best fit of the invisible neutrino decay parameter is eV2, corresponding to a scenario with θ23 in the second octant and normal neutrino mass ordering. The results are consistent with the Standard Model, within a 2.1 σ interval.

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