Four, One, and None: Quantifying the Ultra-High-Energy Neutrino Anomaly Across ANITA-IV, KM3NeT, and IceCube

arXiv:2607.19487 · astro-ph.HE, hep-ex, hep-ph · Submitted 2026-07-21 · Read on arXiv

Dibya S. Chattopadhyay, Carlos A. Argüelles, Vedran Brdar

astro-ph.HE, hep-ex, hep-ph

Submitted: 2026-07-21

Comments: 18+12 pages, 8+7 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Benchmark — 25× in this paper · explained in 2 episodes
• Monte Carlo — 4× in this paper
• Preliminary Reference Earth Model — 2× in this paper
• Abundance — 1× in this paper · explained in 1 episode
• Anisotropy — 1× in this paper · explained in 3 episodes
• Giant Radio Array for Neutrino Detection — 1× in this paper
• Payload for Ultrahigh Energy Observations — 1× in this paper
• Probe of Extreme Multi-Messenger Astrophysics — 1× in this paper

Sources

• The IceCube Neutrino Observatory: Instrumentation and Online Systems
• First observation of PeV-energy neutrinos with IceCube
• Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
• Observation of High-Energy Astrophysical Neutrinos in Three Years of IceCube Data
• The IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data
• Characterization of the Astrophysical Diffuse Neutrino Flux using Starting Track Events in IceCube
• Constraints on the ultra-high energy cosmic neutrino flux from the fourth flight of ANITA
• Differential limit on the extremely-high-energy cosmic neutrino flux in the presence of astrophysical background from nine years of IceCube data
• Search for Extremely-High-Energy Neutrinos and First Constraints on the Ultrahigh-Energy Cosmic-Ray Proton Fraction with IceCube
• The ultra-high-energy event KM3-230213A within the global neutrino landscape
• The Antarctic Impulsive Transient Antenna Ultra-high Energy Neutrino Detector Design, Performance, and Sensitivity for 2006-2007 Balloon Flight
• New Limits on the Ultra-high Energy Cosmic Neutrino Flux from the ANITA Experiment
• Analysis of a Tau Neutrino Origin for the Near-Horizon Air Shower Events Observed by the Fourth Flight of the Antarctic Impulsive Transient Antenna (ANITA)
• Letter of Intent for KM3NeT 2.0
• IceCube-Gen2: The Window to the Extreme Universe
• Baikal-GVD: status and prospects
• The Pacific Ocean Neutrino Experiment
• A multi-cubic-kilometre neutrino telescope in the western Pacific Ocean
• The Payload for Ultrahigh Energy Observations (PUEO): A White Paper
• Design and Sensitivity of the Radio Neutrino Observatory in Greenland (RNO-G)

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