https://doi.org/10.1140/epjc/s10052-021-09893-0
Regular Article - Experimental Physics
Determining the neutrino mass ordering and oscillation parameters with KM3NeT/ORCA
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INFN, Sezione di Catania, Via Santa Sofia 64, 95123, Catania, Italy
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Université de Strasbourg, CNRS, IPHC UMR 7178, 67000, Strasbourg, France
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IFIC-Instituto de Física Corpuscular (CSIC-Universitat de València), c/Catedrático José Beltrán, 2, 46980, Paterna, Valencia, Spain
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Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
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INFN, Sezione di Napoli, Complesso Universitario di Monte S. Angelo, Via Cintia ed. G, 80126, Naples, Italy
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Università di Napoli “Federico II”, Dip. Scienze Fisiche “E. Pancini”, Complesso Universitario di Monte S. Angelo, Via Cintia ed. G, 80126, Naples, Italy
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INFN, Sezione di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy
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Laboratori d’Aplicacions Bioacústiques, Centre Tecnològic de Vilanova i la Geltrú, Universitat Politècnica de Catalunya, Avda. Rambla Exposició, s/n, 08800, Vilanova i la Geltrú, Spain
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Institute of Nuclear and Particle Physics, NCSR Demokritos, Ag. Paraskevi Attikis, 15310, Athens, Greece
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INFN, Sezione di Genova, Via Dodecaneso 33, 16146, Genoa, Italy
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Department of Computer Architecture and Technology/CITIC, University of Granada, 18071, Granada, Spain
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Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Straße 1, 91058, Erlangen, Germany
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Instituto de Investigación para la Gestión Integrada de las Zonas Costeras, Universitat Politècnica de València, C/ Paranimf, 1, 46730, Gandia, Spain
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Astroparticule et Cosmologie, Université de Paris, CNRS, 75013, Paris, France
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Nikhef, National Institute for Subatomic Physics, PO Box 41882, 1009 DB, Amsterdam, The Netherlands
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Faculty of Sciences, University Mohammed V in Rabat, B.P. 1014, 4 av. Ibn Battouta, R.P. 10000, Rabat, Morocco
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INFN, Sezione di Bologna, v.le C. Berti-Pichat, 6/2, 40127, Bologna, Italy
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Dipartimento di Fisica e Astronomia, Università di Bologna, v.le C. Berti-Pichat, 6/2, 40127, Bologna, Italy
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KVI-CART University of Groningen, Groningen, The Netherlands
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Laboratori Nazionali del Sud, INFN, Via S. Sofia 62, 95123, Catania, Italy
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Centre for Space Research, North-West University, Private Bag X6001, 2520, Potchefstroom, South Africa
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Instituto Español de Oceanografía, Unidad Mixta IEO-UPV, C/ Paranimf, 1, 46730, Gandia, Spain
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Faculty of Sciences, University Mohammed I, B.P. 717, BV Mohammed VI, R.P. 60000, Oujda, Morocco
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Dipartimento di Matematica, Università di Salerno e INFN Gruppo Collegato di Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, Italy
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ISS, Atomistilor 409, 077125, Măgurele, Romania
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Institute of Physics/IHEF, University of Amsterdam, PO Box 94216, 1090 GE, Amsterdam, The Netherlands
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Technical Sciences, TNO, PO Box 155, 2600 AD, Delft, The Netherlands
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Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli”, viale Lincoln 5, 81100, Caserta, Italy
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Dipartimento di Fisica, Università La Sapienza, Piazzale Aldo Moro 2, 00185, Rome, Italy
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Dipartimento di Ingegneria dell’Energia Elettrica e dell’Informazione “Guglielmo Marconi”, Università di Bologna, Via dell’Università 50, 47522, Cesena, Italy
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Physics Department, Faculty of Science Semlalia, Cadi Ayyad University, P.O.B. 2390, Av. My Abdellah, 40000, Marrakech, Morocco
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School of Physics, University of the Witwatersrand, Private Bag 3, Wits, 2050, Johannesburg, South Africa
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Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, Via Santa Sofia 64, 95123, Catania, Italy
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INFN, LNF, Via Enrico Fermi, 40, 00044, Frascati, Italy
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INFN, Sezione di Bari, Via Amendola 173, 70126, Bari, Italy
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International Centre for Radio Astronomy Research, Curtin University, 6102, Bentley, WA, Australia
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Subatech, IMT Atlantique, IN2P3-CNRS, Université de Nantes, BP 20722, 4 rue Alfred Kastler-La Chantrerie, 44307, Nantes, France
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University of Bari, Via Amendola 173, 70126, Bari, Italy
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Dipartimento di Fisica, Università di Salerno e INFN Gruppo Collegato di Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, Italy
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Università di Genova, Via Dodecaneso 33, 16146, Genoa, Italy
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University Würzburg, Emil-Fischer-Straße 31, 97074, Würzburg, Germany
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School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, 2751, Penrith, NSW, Australia
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Laboratoire Univers et Particules de Montpellier, Place Eugène Bataillon-CC 72, 34095, Montpellier Cédex 05, France
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Physics Department, University La Sapienza, Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy
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NIOZ (Royal Netherlands Institute for Sea Research), PO Box 59, Den Burg, 1790 AB, Texel, The Netherlands
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National Centre for Nuclear Research, 02-093, Warsaw, Poland
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Department of Physics, Tbilisi State University, 3, Chavchavadze Ave., 0179, Tbilisi, Georgia
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Institut Universitaire de France, 1 rue Descartes, 75005, Paris, France
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Dpto. de Física Teórica y del Cosmos & C.A.F.P.E., University of Granada, 18071, Granada, Spain
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Department Physics, University of Johannesburg, PO Box 524, 2006, Auckland Park, South Africa
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Institut für Astronomie und Astrophysik, Eberhard Karls Universität Tübingen, Sand 1, 72076, Tübingen, Germany
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Leiden Institute of Physics, Leiden University, PO Box 9504, 2300 RA, Leiden, The Netherlands
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Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, 56127, Pisa, Italy
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Friedrich-Alexander-Universität Erlangen-Nürnberg, Remeis Sternwarte, Sternwartstraße 7, 96049, Bamberg, Germany
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Université de Strasbourg, Université de Haute Alsace, GRPHE, 34, Rue du Grillenbreit, 68008, Colmar, France
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INFN, Sezione di Pisa, Largo Bruno Pontecorvo 3, 56127, Pisa, Italy
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Institut für Kernphysik, University of Münster, Wilhelm-Klemm-Str. 9, 48149, Münster, Germany
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Department of Physics and Astronomy, Utrecht University, PO Box 80000, 3508 TA, Utrecht, The Netherlands
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Accademia Navale di Livorno, Viale Italia 72, 57100, Livorno, Italy
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INFN, CNAF, v.le C. Berti-Pichat, 6/2, 40127, Bologna, Italy
dj
steffen.hallmann@fau.de
ds
jannik.hofestaedt@fau.de
gv
mathieu.perrin-terrin@cppm.in2p3.fr
Received:
19
March
2021
Accepted:
30
November
2021
Published online:
11
January
2022
The next generation of water Cherenkov neutrino telescopes in the Mediterranean Sea are under construction offshore France (KM3NeT/ORCA) and Sicily (KM3NeT/ARCA). The KM3NeT/ORCA detector features an energy detection threshold which allows to collect atmospheric neutrinos to study flavour oscillation. This paper reports the KM3NeT/ORCA sensitivity to this phenomenon. The event reconstruction, selection and classification are described. The sensitivity to determine the neutrino mass ordering was evaluated and found to be 4.4
if the true ordering is normal and 2.3 if inverted, after 3 years of data taking. The precision to measure 
and 
were also estimated and found to be 
and 
for normal neutrino mass ordering and, 
and 
for inverted ordering. Finally, a unitarity test of the leptonic mixing matrix by measuring the rate of tau neutrinos is described. Three years of data taking were found to be sufficient to exclude 
event rate variations larger than 20% at 
level.
Deceased: Giorgos Androulakis.
© The Author(s) 2022
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