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◆ Physical review letters2026-08-21

Characterization of the Three-Flavor Composition of Cosmic Neutrinos with IceCube.

R Abbasi, M Ackermann, J Adams, S K Agarwalla, J A Aguilar, M Ahlers, J M Alameddine, S Ali, N M Amin, K Andeen, C Argüelles, Y Ashida, S Athanasiadou, S N Axani, R Babu, X Bai, J Baines-Holmes, A Balagopal V, S W Barwick, S Bash, V Basu, R Bay, J J Beatty, J Becker Tjus, P Behrens, J Beise, C Bellenghi, B Benkel, S BenZvi, D Berley, E Bernardini, D Z Besson, E Blaufuss, L Bloom, S Blot, I Bodo, F Bontempo, J Y Book Motzkin, C Boscolo Meneguolo, S Böser, O Botner, J Böttcher, J Braun, B Brinson, Z Brisson-Tsavoussis, R T Burley, D Butterfield, M A Campana, K Carloni, J Carpio, S Chattopadhyay, N Chau, Z Chen, D Chirkin, S Choi, B A Clark, A Coleman, P Coleman, G H Collin, D A Coloma Borja, A Connolly, J M Conrad, D F Cowen, C De Clercq, J J DeLaunay, D Delgado, T Delmeulle, S Deng, P Desiati, K D de Vries, G de Wasseige, T DeYoung, J C Díaz-Vélez, S DiKerby, T Ding, M Dittmer, A Domi, L Draper, L Dueser, D Durnford, K Dutta, M A DuVernois, T Ehrhardt, L Eidenschink, A Eimer, P Eller, E Ellinger, D Elsässer, R Engel, H Erpenbeck, W Esmail, S Eulig, J Evans, P A Evenson, K L Fan, K Fang, K Farrag, A R Fazely, A Fedynitch, N Feigl, C Finley, L Fischer, D Fox, A Franckowiak, S Fukami, P Fürst, J Gallagher, E Ganster, A Garcia, M Garcia, G Garg, E Genton, L Gerhardt, A Ghadimi, T Glüsenkamp, J G Gonzalez, S Goswami, A Granados, D Grant, S J Gray, S Griffin, S Griswold, K M Groth, D Guevel, C Günther, P Gutjahr, C Ha, C Haack, A Hallgren, L Halve, F Halzen, L Hamacher, M Ha Minh, M Handt, K Hanson, J Hardin, A A Harnisch, P Hatch, A Haungs, J Häußler, K Helbing, J Hellrung, B Henke, L Hennig, F Henningsen, L Heuermann, R Hewett, N Heyer, S Hickford, A Hidvegi, C Hill, G C Hill, R Hmaid, K D Hoffman, D Hooper, S Hori, K Hoshina, M Hostert, W Hou, M Hrywniak, T Huber, K Hultqvist, K Hymon, A Ishihara, W Iwakiri, M Jacquart, S Jain, O Janik, M Jansson, M Jeong, M Jin, N Kamp, D Kang, W Kang, A Kappes, L Kardum, T Karg, M Karl, A Karle, A Katil, M Kauer, J L Kelley, M Khanal, A Khatee Zathul, A Kheirandish, H Kimku, J Kiryluk, C Klein, S R Klein, Y Kobayashi, A Kochocki, R Koirala, H Kolanoski, T Kontrimas, L Köpke, C Kopper, D J Koskinen, P Koundal, M Kowalski, T Kozynets, A Kravka, N Krieger, J Krishnamoorthi, T Krishnan, K Kruiswijk, E Krupczak, A Kumar, E Kun, N Kurahashi, N Lad, C Lagunas Gualda, L Lallement Arnaud, M Lamoureux, M J Larson, F Lauber, J P Lazar, K Leonard DeHolton, A Leszczyńska, J Liao, C Lin, Q R Liu, Y T Liu, M Liubarska, C Love, L Lu, F Lucarelli, W Luszczak, Y Lyu, M Macdonald, J Madsen, E Magnus, Y Makino, E Manao, S Mancina, A Mand, I C Mariş, S Marka, Z Marka, L Marten, I Martinez-Soler, R Maruyama, J Mauro, F Mayhew, F McNally, J V Mead, K Meagher, S Mechbal, A Medina, M Meier, Y Merckx, L Merten, J Mitchell, L Molchany, S Mondal, T Montaruli, R W Moore, Y Morii, A Mosbrugger, M Moulai, D Mousadi, E Moyaux, T Mukherjee, R Naab, M Nakos, U Naumann, J Necker, L Neste, M Neumann, H Niederhausen, M U Nisa, K Noda, A Noell, A Novikov, A Obertacke, V O'Dell, A Olivas, R Orsoe, J Osborn, E O'Sullivan, V Palusova, H Pandya, A Parenti, N Park, V Parrish, E N Paudel, L Paul, C Pérez de Los Heros, T Pernice, T C Petersen, J Peterson, M Plum, A Pontén, V Poojyam, Y Popovych, M Prado Rodriguez, B Pries, R Procter-Murphy, G T Przybylski, L Pyras, C Raab, J Rack-Helleis, N Rad, M Ravn, K Rawlins, Z Rechav, A Rehman, I Reistroffer, E Resconi, S Reusch, C D Rho, W Rhode, L Ricca, B Riedel, A Rifaie, E J Roberts, M Rongen, A Rosted, C Rott, T Ruhe, L Ruohan, D Ryckbosch, J Saffer, D Salazar-Gallegos, P Sampathkumar, A Sandrock, G Sanger-Johnson, M Santander, S Sarkar, M Scarnera, P Schaile, M Schaufel, H Schieler, S Schindler, L Schlickmann, B Schlüter, F Schlüter, N Schmeisser, T Schmidt, F G Schröder, L Schumacher, S Schwirn, S Sclafani, D Seckel, L Seen, M Seikh, S Seunarine, P A Sevle Myhr, R Shah, S Shah, S Shefali, N Shimizu, B Skrzypek, R Snihur, J Soedingrekso, A Søgaard, D Soldin, P Soldin, G Sommani, C Spannfellner, G M Spiczak, C Spiering, J Stachurska, M Stamatikos, T Stanev, T Stezelberger, T Stürwald, T Stuttard, G W Sullivan, I Taboada, S Ter-Antonyan, A Terliuk, A Thakuri, M Thiesmeyer, W G Thompson, J Thwaites, S Tilav, K Tollefson, S Toscano, D Tosi, A Trettin, A K Upadhyay, K Upshaw, A Vaidyanathan, N Valtonen-Mattila, J Valverde, J Vandenbroucke, T Van Eeden, N van Eijndhoven, L Van Rootselaar, J van Santen, J Vara, F Varsi, M Venugopal, M Vereecken, S Vergara Carrasco, S Verpoest, D Veske, A Vijai, J Villarreal, C Walck, A Wang, E H S Warrick, C Weaver, P Weigel, A Weindl, J Weldert, A Y Wen, C Wendt, J Werthebach, M Weyrauch, N Whitehorn, C H Wiebusch, D R Williams, L Witthaus, M Wolf, G Wrede, X W Xu, J P Yanez, Y Yao, E Yildizci, S Yoshida, R Young, F Yu, S Yu, T Yuan, S Yun-Cárcamo, A Zander Jurowitzki, A Zegarelli, S Zhang, Z Zhang, P Zhelnin, P Zilberman, IceCube Collaboration

原始摘要(英文原文)· Original abstract
The flavor composition of cosmic neutrinos probes both the physical properties of their sources and oscillations over energies and distances unreachable by terrestrial experiments. Using 11.4 yr of IceCube data, we analyze the flavor composition of the all-sky neutrino flux from 5 TeV-10 PeV, significantly lowering the analysis threshold from a previous minimum of 35 TeV. The best-fit flavor fractions are f_{e},f_{μ},f_{τ}=0.30_{-0.15}^{+0.20}, 0.37_{-0.16}^{+0.14}, 0.33_{-0.25}^{+0.24}. For the first time, we report that neutrinos of all three flavors are present in the observed cosmic neutrino flux at >90% confidence level. We infer the flavor composition at their sources, finding good agreement with pion decay while pure neutron decay is disfavored, with posterior probability 2.7×10^{-5} (∼4σ).
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Characterization of the Three-Flavor Composition of Cosmic Neutrinos with IceCube. — 科研速览 Science Skim