First observation of PeV-energy neutrinos with IceCube
read the original abstract
We report on the observation of two neutrino-induced events which have an estimated deposited energy in the IceCube detector of 1.04 $\pm$ 0.16 and 1.14 $\pm$ 0.17 PeV, respectively, the highest neutrino energies observed so far. These events are consistent with fully contained particle showers induced by neutral-current $\nu_{e,\mu,\tau}$ ($\bar\nu_{e,\mu,\tau}$) or charged-current $\nu_{e}$ ($\bar\nu_{e}$) interactions within the IceCube detector. The events were discovered in a search for ultra-high energy neutrinos using data corresponding to 615.9 days effective livetime. The expected number of atmospheric background is $0.082 \pm 0.004 \text{(stat)}^{+0.041}_{-0.057} \text{(syst)}$. The probability to observe two or more candidate events under the atmospheric background-only hypothesis is $2.9\times10^{-3}$ ($2.8\sigma$) taking into account the uncertainty on the expected number of background events. These two events could be a first indication of an astrophysical neutrino flux, the moderate significance, however, does not permit a definitive conclusion at this time.
This paper has not been read by Pith yet.
Forward citations
Cited by 9 Pith papers
-
Charged Lepton Flavor Violation at Neutrino Telescopes
Proposes a new CLFV search in IceCube using cosmic-ray muons, deriving sensitivities for EFT operators and a Z' model, with comparisons to other experiments and projections for future telescopes.
-
Electron stability constrains neutrino time delays
Electron stability observations rule out the subluminal LIV parameters previously used to explain high-energy neutrino time delays.
-
Complex Analysis of Askaryan Radiation: UHE-$\nu$ Identification and Reconstruction using the Hilbert Envelope of Observed Signals
A new analytic Askaryan model including ice propagation and RF response matches Monte Carlo simulations with correlations above 0.94 and rejects thermal noise at very low rates.
-
The Delta Resonance in the Neutrino Sky
A proton spectrum with index -3.1 interacting with 0.3 keV X-rays via the Delta resonance reproduces the observed 30 TeV neutrino break and limits the accompanying gamma-ray cascade contribution to ~10% of the isotrop...
-
Ultrahigh-energy cosmogenic neutrino emissions in the high-redshift universe
High-redshift AGN emitting UHE protons up to 10^19 eV generate a 50 PeV cosmogenic neutrino bump consistent with IceCube data from their JWST-measured average properties without fine-tuning.
-
Interplay between Escaping Cosmic Rays and Interstellar Medium: Driving of Galactic Winds and Shaping the Local Proton Spectrum
Escaping cosmic rays accelerate and heat the ISM in CR-hydro simulations, driving galactic winds comparable to the star formation rate and providing alternative explanations for the local proton spectrum under locally...
-
Nuclei in high-energy neutrino sources: A multimessenger study of in-source propagation
Monte Carlo simulations of nuclear cascades in NGC 1068 demonstrate that injected nuclear composition imprints on neutrino and gamma-ray spectra, supported by a re-analysis of archival COMPTEL observations.
-
Carpet results on astrophysical gamma rays above 100 TeV
Carpet reports first results from a search for astrophysical gamma rays with energies above 100 TeV using an air-shower array equipped with muon discrimination.
-
Particle Astrophysics with High and Ultrahigh Energy Neutrinos
Recent high and ultrahigh energy neutrino detections open a new observational window to the universe by revealing sources and processes inaccessible via photons.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.