Observation of an ultra-high-energy cosmic neutrino with KM3NeT

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2025年2月12日

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S. Aiello,
A. Albert,
A. R. Alhebsi,
M. Alshamsi,
S. Alves Garre,
A. Ambrosone,
F. Ameli,
M. Andre,
M. Anghinolfi,
L. Aphecetche,
M. Ardid,
S. Ardid,
C. Argüelles,
H. Atmani,
J. Aublin,
F. Badaracco,
L. Bailly-Salins,
Z. Bardačová,
B. Baret,
A. Bariego-Quintana,
Y. Becherini,
M. Bendahman,
F. Benfenati Gualandi,
M. Benhassi,
M. Bennani,
D. M. Benoit,
E. Berbee,
V. Bertin,
S. Biagi,
M. Boettcher,
D. Bonanno,
A. B. Bouasla,
J. Boumaaza,
M. Bouta,
M. Bouwhuis,
C. Bozza,
R. M. Bozza,
H. Brânzaş,
F. Bretaudeau,
M. Breuhaus,
R. Bruijn,
J. Brunner,
R. Bruno,
E. Buis,
R. Buompane,
S. Buson,
J. Busto,
B. Caiffi,
D. Calvo,
A. Capone,
F. Carenini,
V. Carretero,
T. Cartraud,
P. Castaldi,
V. Cecchini,
S. Celli,
L. Cerisy,
M. Chabab,
A. Chen,
S. Cherubini,
T. Chiarusi,
M. Circella,
R. Cocimano,
J. A. B. Coelho,
A. Coleiro,
S. Colonges,
A. Condorelli,
R. Coniglione,
P. Coyle,
A. Creusot,
G. Cuttone,
A. D’Amico,
R. Dallier,
A. De Benedittis,
B. De Martino,
G. De Wasseige,
V. Decoene,
I. Del Rosso,
L. S. Di Mauro,
I. Di Palma,
A. F. Diaz,
D. Diego-Tortosa,
C. Distefano,
A. Domi,
C. Donzaud,
D. Dornic,
E. Drakopoulou,
D. Drouhin,
J.-G. Ducoin,
R. Dvornický,
T. Eberl,
E. Eckerová,
A. Eddymaoui,
T. van Eeden,
M. Eff,
D. van Eijk,
I. El Bojaddaini,
S. El Hedri,
V. Ellajosyula,
A. Enzenhöfer,
G. Ferrara,
M. D. Filipović,
F. Filippini,
D. Franciotti,
L. A. Fusco,
S. Gagliardini,
T. Gal,
J. García Méndez,
A. Garcia Soto,
C. Gatius Oliver,
N. Geißelbrecht,
E. Genton,
H. Ghaddari,
L. Gialanella,
B. K. Gibson,
E. Giorgio,
I. Goos,
P. Goswami,
S. R. Gozzini,
R. Gracia,
K. Graf,
C. Guidi,
B. Guillon,
M. Gutiérrez,
C. Haack,
H. van Haren,
A. Heijboer,
L. Hennig,
S. Henry,
J. J. Hernández-Rey,
W. Idrissi Ibnsalih,
A. Ilioni,
G. Illuminati,
D. Joly,
M. de Jong,
P. de Jong,
B. J. Jung,
P. Kalaczyński,
O. Kalekin,
N. Kamp,
U. F. Katz,
G. Kistauri,
C. Kopper,
A. Kouchner,
Y. Y. Kovalev,
V. Kueviakoe,
V. Kulikovskiy,
R. Kvatadze,
M. Labalme,
R. Lahmann,
M. Lamoureux,
S. Lancelin,
G. Larosa,
C. Lastoria,
J. Lazar,
A. Lazo,
S. Le Stum,
G. Lehaut,
V. Lemaitre,
E. Leonora,
N. Lessing,
G. Levi,
M. Lincetto,
M. Lindsey Clark,
F. Longhitano,
N. Lumb,
F. Magnani,
J. Majumdar,
L. Malerba,
F. Mamedov,
A. Manfreda,
M. Marconi,
A. Margiotta,
A. Marinelli,
C. Markou,
L. Martin,
F. Marzaioli,
M. Mastrodicasa,
S. Mastroianni,
J. Mauro,
G. Miele,
P. Migliozzi,
E. Migneco,
M. L. Mitsou,
C. M. Mollo,
M. Mongelli,
L. Morales-Gallegos,
A. Moussa,
I. Mozun Mateo,
R. Muller,
M. R. Musone,
M. Musumeci,
S. Navas,
A. Nayerhoda,
C. A. Nicolau,
B. Nkosi,
B. Ó Fearraigh,
V. Oliviero,
A. Orlando,
E. Oukacha,
D. Paesani,
J. Palacios González,
G. Papalashvili,
C. Paries,
V. Parisi,
E. J. Pastor Gomez,
C. Pastore,
A. M. Păun,
G. E. Păvălaş,
S. Peña Martínez,
M. Perrin-Terrin,
V. Pestel,
R. Pestes,
L. Pfeiffer,
P. Piattelli,
A. Plavin,
C. Poirè,
V. Popa,
T. Pradier,
J. Prado,
S. Pulvirenti,
C. A. Quiroz-Rangel,
N. Randazzo,
S. Razzaque,
I. C. Rea,
D. Real,
G. Riccobene,
J. Robinson,
A. Romanov,
E. Ros,
A. Šaina,
F. Salesa Greus,
D. F. E. Samtleben,
A. Sánchez Losa,
S. Sanfilippo,
M. Sanguineti,
D. Santonocito,
P. Sapienza,
J. Schmelling,
J. Schnabel,
J. Schumann,
H. M. Schutte,
J. Seneca,
N. Sennan,
P. Sevle,
I. Sgura,
R. Shanidze,
A. Sharma,
Y. Shitov,
F. Šimkovic,
A. Simonelli,
A. Sinopoulou,
B. Spisso,
M. Spurio,
D. Stavropoulos,
I. Štekl,
M. Taiuti,
Y. Tayalati,
H. Thiersen,
S. Thoudam,
I. Tosta e Melo,
B. Trocmé,
V. Tsourapis,
A. Tudorache,
E. Tzamariudaki,
A. Ukleja,
A. Vacheret,
V. Valsecchi,
V. Van Elewyck,
G. Vannoye,
G. Vasileiadis,
F. Vazquez de Sola,
C. Verilhac,
A. Veutro,
S. Viola,
D. Vivolo,
A. van Vliet,
A. Y. Wen,
E. de Wolf,
I. Lhenry-Yvon,
S. Zavatarelli,
A. Zegarelli,
D. Zito,
J. D. Zornoza,
J. Zúñiga,
N. Zywucka

摘要

The detection of cosmic neutrinos with energies above a teraelectronvolt (TeV) offers a unique exploration into astrophysical phenomena^1–3. Electrically neutral and interacting only by means of the weak interaction, neutrinos are not deflected by magnetic fields and are rarely absorbed by interstellar matter: their direction indicates that their cosmic origin might be from the farthest reaches of the Universe. High-energy neutrinos can be produced when ultra-relativistic cosmic-ray protons or nuclei interact with other matter or photons, and their observation could be a signature of these processes. Here we report an exceptionally high-energy event observed by KM3NeT, the deep-sea neutrino telescope in the Mediterranean Sea⁴, which we associate with a cosmic neutrino detection. We detect a muon with an estimated energy of $12{0}_{-60}^{+110}$ $12 0_{- 60}^{+ 110}$ petaelectronvolts (PeV). In light of its enormous energy and near-horizontal direction, the muon most probably originated from the interaction of a neutrino of even higher energy in the vicinity of the detector. The cosmic neutrino energy spectrum measured up to now^5–7 falls steeply with energy. However, the energy of this event is much larger than that of any neutrino detected so far. This suggests that the neutrino may have originated in a different cosmic accelerator than the lower-energy neutrinos, or this may be the first detection of a cosmogenic neutrino⁸, resulting from the interactions of ultra-high-energy cosmic rays with background photons in the Universe.