Spectral analysis of the high-energy IceCube neutrinos

Abstract

A full energy and flavor-dependent analysis of the three-year high-energy IceCube neutrino events is presented. By means of multidimensional fits, we derive the current preferred values of the high-energy neutrino flavor ratios, the normalization and spectral index of the astrophysical fluxes, and the expected atmospheric background events, including a prompt component. A crucial assumption resides on the choice of the energy interval used for the analyses, which significantly biases the results. When restricting ourselves to the ~30 TeV - 3 PeV energy range, which contains all the observed IceCube events, we find that the inclusion of the spectral information improves the fit to the canonical flavor composition at Earth, (1:1:1), with respect to a single-energy bin analysis. Increasing both the minimum and the maximum deposited energies has dramatic effects on the reconstructed flavor ratios as well as on the spectral index. Imposing a higher threshold of 60 TeV yields a slightly harder spectrum by allowing a larger muon neutrino component, since above this energy most atmospheric tracklike events are effectively removed. Extending the high-energy cutoff to fully cover the Glashow resonance region leads to a softer spectrum and a preference for tau neutrino dominance, as none of the expected electron antineutrino induced showers have been observed so far. The lack of showers at energies above 2 PeV may point to a broken power-law neutrino spectrum. Future data may confirm or falsify whether or not the recently discovered high-energy neutrino fluxes and the long-standing detected cosmic rays have a common origin.

arXiv comment33 pages, 13 figures. v3: one extra figure (fig. 13), some references updated and some formulae moved to the Appendix. It matches version published in PRD

References in corpus (146)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• A Unified Approach to the Classical Statistical Analysis of Small Signals
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Multimodal nested sampling: an efficient and robust alternative to MCMC methods for astronomical data analysis
• Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
• Observation of High-Energy Astrophysical Neutrinos in Three Years of IceCube Data
• Importance Nested Sampling and the MultiNest Algorithm
• First observation of PeV-energy neutrinos with IceCube
• Ultrahigh-Energy Neutrino Interactions
• Neutrino Interactions at Ultrahigh Energies
• Updated fit to three neutrino mixing: status of leptonic CP violation
• Neutrino oscillations refitted
• Calculation of atmospheric neutrino flux using the interaction model calibrated with atmospheric muon data
• Detecting Nutau Oscillations as PeV Energies
• Detecting Tau Neutrino Oscillations at PeV Energies
• Status of three-neutrino oscillation parameters, circa 2013
• Testing the Hadronuclear Origin of PeV Neutrinos Observed with IceCube
• Photohadronic Neutrinos from Transients in Astrophysical Sources
• Spectrum of cosmic-ray nucleons and the atmospheric muon charge ratio
• Prompt neutrino fluxes from atmospheric charm
• Flux of Atmospheric Neutrinos
• Atmospheric and Astrophysical Neutrinos above 1 TeV Interacting in IceCube
• TeV-PeV Neutrinos from Low-Power Gamma-Ray Burst Jets inside Stars
• Measuring Flavor Ratios of High-Energy Astrophysical Neutrinos
• Decay of High-Energy Astrophysical Neutrinos
• Flavor Composition and Energy Spectrum of Astrophysical Neutrinos
• Tau Neutrino Appearance with a 1000 Megaparsec Baseline
• Flavoring Astrophysical Neutrinos: Flavor Ratios Depend on Energy
• Probing the Galactic Origin of the IceCube Excess with Gamma-Rays
• Star-forming galaxies as the origin of diffuse high-energy backgrounds: Gamma-ray and neutrino connections, and implications for starburst history
• Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube
• Neutrinos at IceCube from Heavy Decaying Dark Matter
• Effects of neutrino mixing on high-energy cosmic neutrino flux
• Cosmic neutrino cascades from secret neutrino interactions
• Propagation of Muons and Taus at High Energies
• Parton Distributions and the Strong Coupling Strength: CTEQ6AB PDFs
• Are IceCube neutrinos unveiling PeV-scale decaying dark matter?
• Cosmic Neutrino Pevatrons: A Brand New Pathway to Astronomy, Astrophysics, and Particle Physics
• Neutrinos from WIMP Annihilations Obtained Using a Full Three-Flavor Monte Carlo Approach
• Pseudo-Dirac Neutrinos, a Challenge for Neutrino Telescopes
• Three component model of cosmic ray spectra from 10 GeV to 100 PeV
• Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events?
• Ice Cube Observed PeV Neutrinos from AGN Cores
• Neutrino Decays over Cosmological Distances and the Implications for Neutrino Telescopes
• Pinpointing Extragalactic Neutrino Sources in Light of Recent IceCube Observations
• Vetoing atmospheric neutrinos in a high energy neutrino telescope
• IceCube PeV-EeV Neutrinos and Secret Interactions of Neutrinos
• A Galactic Halo Origin of the Neutrinos Detected by IceCube
• Galactic Point Sources of TeV Antineutrinos
• Probing Planck scale physics with IceCube
• Neutrino Observatories Can Characterize Cosmic Sources and Neutrino Properties
• Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 59-string configuration
• Sensitivity to ${\theta }_{13}$ and $\delta$ in the Decaying Astrophysical Neutrino Scenario
• On the flavor composition of the high-energy neutrino events in IceCube
• PeV neutrinos from intergalactic interactions of cosmic rays emitted by active galactic nuclei
• A generalized self-veto probability for atmospheric neutrinos
• IceCube events and decaying dark matter: hints and constraints
• Flavor Ratios of Astrophysical Neutrinos: Implications for Precision Measurements
• Demystifying the PeV Cascades in IceCube: Less (Energy) is More (Events)
• Energy dependent neutrino flavor ratios from cosmic accelerators on the Hillas plot
• The Galactic Center Origin of a Subset of IceCube Neutrino Events
• PeV neutrinos from interactions of cosmic rays with the interstellar medium in the Galaxy
• Tau Neutrinos Underground: Signals of ${\nu }_{\mu }\to {\nu }_{\tau }$ Oscillations with Extragalactic Neutrinos
• Searching for Traces of Planck-Scale Physics with High Energy Neutrinos
• Which is the flavor of cosmic neutrinos seen by IceCube?
• Diffuse PeV neutrinos from EeV cosmic ray sources: semi-relativistic hypernova remnants in star-forming galaxies
• Propagation of tau neutrinos and tau leptons through the Earth and their detection in underwater/ice neutrino telescopes
• Structured jets in BL Lac objects: efficient PeV neutrino factories?
• Enhanced signal of astrophysical tau neutrinos propagating through Earth
• Sub-PeV Neutrinos from TeV Unidentified Sources in the Galaxy
• Cosmic-Ray Neutrinos from the Decay of Long-Lived Particle and the Recent IceCube Result
• High-energy neutrinos from radio galaxies
• On The Origin of IceCube's PeV Neutrinos
• Mind the gap on Icecube: Cosmic neutrino spectrum and muon anomalous magnetic moment in the gauged L_μ - L_τ model
• Penetration of the Earth by ultrahigh energy neutrinos predicted by low x QCD
• Neutrinos in IceCube from AGN's
• Neutrino Events at IceCube and the Fermi Bubbles
• Pinning down the cosmic ray source mechanism with new IceCube data
• What IceCube data tell us about neutrino emission from star-forming galaxies (so far)
• Glashow resonance as a window into cosmic neutrino sources
• The Direct Detection of Boosted Dark Matter at High Energies and PeV events at IceCube
• CνB absorption line in the neutrino spectrum at IceCube
• Standard Model Explanation of the Ultra-high Energy Neutrino Events at IceCube
• Pseudo-Dirac Neutrino Scenario: Cosmic Neutrinos at Neutrino Telescopes
• Flavor Composition of UHE Neutrinos at Source and at Neutrino Telescopes
• Atmospheric neutrino flux supported by recent muon experiments
• An Analysis of Cosmic Neutrinos: Flavor Composition at Source and Neutrino Mixing Parameters
• TANAMI Blazars in the IceCube PeV Neutrino Fields
• Neutrino Propagation Through Matter
• Probing the 2-3 leptonic mixing at high-energy neutrino telescopes
• Propagation of Superluminal PeV IceCube Neutrinos: A High Energy Spectral Cutoff or New Constraints on Lorentz Invariance Violation
• The diffuse gamma-ray flux associated with sub-PeV/PeV neutrinos from starburst galaxies
• Dips in the Diffuse Supernova Neutrino Background
• Superheavy Particle Origin of IceCube PeV Neutrino Events
• Tau neutrino propagation and tau energy loss
• High energy neutrino yields from astrophysical sources I: Weakly magnetized sources
• Possible Interpretations of IceCube High-Energy Neutrino Events
• Galactic PeV neutrinos from dark matter annihilation
• GeV - PeV Neutrino Production and Oscillation in hidden jets from GRBs
• Long-lived PeV-EeV Neutrinos from GRB Blastwave
• Explanation for the low flux of high energy astrophysical muon-neutrinos
• Propagation of Extremely-high Energy Leptons in the Earth: Implications to their detection by the IceCube Neutrino Telescope
• Implications of a PeV neutrino spectral cutoff in GRB models
• Neutrino Mixing and Neutrino Telescopes
• Oscillation effects on high-energy neutrino fluxes from astrophysical hidden sources
• Discovering Long Wavelength Neutrino Oscillations in the Distorted Neutrino Spectrum of Galactic Supernova Remnants
• Stringent constraint on neutrino Lorentz-invariance violation from the two IceCube PeV neutrinos
• IceCube astrophysical neutrinos without a spectral cutoff and (10^15-10^17) eV cosmic gamma radiation
• Cosmo MSW effect for mass varying neutrinos
• Searching for ${\nu }_{\mu }\to {\nu }_{\tau }$ Oscillations with Extragalactic Neutrinos
• Cosmological Implications of High-Energy Neutrino Emission from the Decay of Long-Lived Particle
• Cosmic PeV Neutrinos and the Sources of Ultrahigh Energy Protons
• Tracing very high energy neutrinos from cosmological distances in ice
• The energy spectrum of tau leptons induced by the high energy Earth-skimming neutrinos
• Secondary Neutrinos from Tau Neutrino Interactions in Earth
• Neutrino Lighthouse at Sagittarius A*
• High-energy neutrino fluxes and flavor ratio in the Earth's atmosphere
• Ultra-high neutrino fluxes as a probe for non-standard physics
• Extreme Energy nu_tau Propagation Through the Earth
• End of the cosmic neutrino energy spectrum
• Pseudo-Dirac neutrinos via mirror-world and depletion of UHE neutrinos
• Determination of the Neutrino Flavor Ratio at the Astrophysical Source
• Possible High-Energy Neutrino and Photon Signals from Gravitational Wave Bursts due to Double Neutron Star Mergers
• Aspects of the Flavor Triangle for Cosmic Neutrino Propagation
• TeV gravity at neutrino telescopes
• Estimating the contribution of Galactic sources to the diffuse neutrino flux
• Shadowing of Ultrahigh Energy Neutrinos
• Diffuse Ultra-High Energy Neutrino Fluxes and Physics Beyond the Standard Model
• Constraining Astrophysical Neutrino Flavor Composition from Leptonic Unitarity
• Neutron β-decay as the origin of IceCube's PeV (anti)neutrinos
• Cosmic Neutrino Flavor Ratios with Broken ${\nu }_{\mu }-{\nu }_{\tau }$ Symmetry
• Describing the Observed Cosmic Neutrinos by Interactions of Nuclei with Matter
• PeV-EeV neutrinos from GRB blastwave in IceCube and future neutrino telescopes
• Cosmogenic neutrinos and signals of TeV gravity in air showers and neutrino telescopes
• Probing CP violation with the three years ultra-high energy neutrinos from IceCube
• Testing neutrino magnetic moments with AGNs
• Cosmic UHE Neutrino Signatures
• Implications of Fermi-LAT observations on the origin of IceCube neutrinos
• Energy and Angular Distribution of Upward UHE Neutrinos and Signals of Low Scale Gravity: Role of Tau Decay
• The Glashow resonance in neutrino-photon scattering
• The fraction of muon tracks in cosmic neutrinos
• Origin Of The High Energy Cosmic Neutrino Background
• A new physics interpretation of the IceCube data
• Signatures of cosmic tau-neutrinos
• Leptonic CP violation at neutrino telescopes
• On the transport equations of cosmic neutrinos passing through Earth and secondary nu_mu fluxes

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• The IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data
• Hidden Cosmic-Ray Accelerators as an Origin of TeV-PeV Cosmic Neutrinos
• The Giant Radio Array for Neutrino Detection (GRAND): Science and Design
• Theoretically palatable flavor combinations of astrophysical neutrinos
• Ultra-High-Energy Cosmic Rays
• An All-Sky Search for Three Flavors of Neutrinos from Gamma-Ray Bursts with the IceCube Neutrino Observatory
• New Physics in Astrophysical Neutrino Flavor
• Probing BSM Neutrino Physics with Flavor and Spectral Distortions: Prospects for Future High-Energy Neutrino Telescopes
• Extracting the Energy-Dependent Neutrino-Nucleon Cross Section Above 10 TeV Using IceCube Showers
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• Galactic Neutrinos in the TeV to PeV Range
• Boosted Dark Matter in IceCube and at the Galactic Center
• Invisible Neutrino Decay Resolves IceCube's Track and Cascade Tension
• MeV scale leptonic force for cosmic neutrino spectrum and muon anomalous magnetic moment
• Inferring the flavor of high-energy astrophysical neutrinos at their sources
• A Possible Two-component Flux for the High Energy Neutrino Events at IceCube
• The Future of High-Energy Astrophysical Neutrino Flavor Measurements
• Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor
• Discrepancies in simultaneous explanation of Flavor Anomalies and IceCube PeV Events using Leptoquarks
• Astrophysical neutrinos flavored with Beyond the Standard Model physics
• Heavy right-handed neutrino dark matter and PeV neutrinos at IceCube
• Analysis of the 4-year IceCube high-energy starting events
• Bounds on secret neutrino interactions from high-energy astrophysical neutrinos
• Universe's Worth of Electrons to Probe Long-Range Interactions of High-Energy Astrophysical Neutrinos
• Testing neutrino decay scenarios with IceCube data
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• Prompt neutrinos from atmospheric charm in the general-mass variable-flavor-number scheme
• Unifying leptogenesis, dark matter and high-energy neutrinos with right-handed neutrino mixing via Higgs portal
• Flavor of cosmic neutrinos preserved by ultralight dark matter
• Neutrino propagation in the galactic dark matter halo
• IceCube Events from Heavy DM decays through the Right-handed Neutrino Portal
• Pairwise sums in colourings of the reals
• A Combined Astrophysical and Dark Matter Interpretation of the IceCube HESE and Throughgoing Muon Events
• Multi-component Fermionic Dark Matter and IceCube PeV scale Neutrinos in Left-Right Model with Gauge Unification
• High-energy neutrino attenuation in the Earth and its associated uncertainties
• The natural parametrization of cosmic neutrino oscillations
• Update on decaying and annihilating heavy dark matter with the 6-year IceCube HESE data
• Sterile Neutrinos and Flavor Ratios in IceCube
• Echo Technique to Distinguish Flavors of Astrophysical Neutrinos
• Non-standard neutrino interactions in the Earth and the flavor of astrophysical neutrinos
• Decaying dark matter at IceCube and its signature on High Energy gamma experiments
• Unitarity Bounds of Astrophysical Neutrinos
• Probing decaying heavy dark matter with the 4-year IceCube HESE data
• Seeking leptoquarks in IceCube
• Probing Cosmic-Ray Accelerated Light Dark Matter with IceCube
• Multi-PeV Signals from a New Astrophysical Neutrino Flux Beyond the Glashow Resonance
• R-parity Violating Supersymmetry at IceCube
• Evidence for a break in the spectrum of astrophysical neutrinos
• Hidden Glashow resonance in neutrino-nucleus collisions
• Using High-Energy Neutrinos As Cosmic Magnetometers
• The flavor composition of astrophysical neutrinos after 8 years of IceCube: an indication of neutron decay scenario?
• A Model for Pseudo-Dirac Neutrinos: Leptogenesis and Ultra-High Energy Neutrinos
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• IceCube Flavor Ratios with Identified Astrophysical Sources: Towards Improving New Physics Testability
• Signatures of microscopic black holes and extra dimensions at future neutrino telescopes
• White paper on EUSO-SPB2
• How Unequal Fluxes of High Energy Astrophysical Neutrinos and Antineutrinos can Fake New Physics
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• A comparative study of the $S_1$ and $U_1$ leptoquark effects in the light quark regime
• Neutrino Oscillation in Dense Matter
• Neutrino lighthouse powered by Sagittarius A* disk dynamo
• Flavors of Astrophysical Neutrinos with Active-Sterile Mixing
• Probing strong dynamics with cosmic neutrinos
• Leptoquarks: 750 GeV Diphoton Resonance and IceCube Events
• Cutoff of IceCube Neutrino Spectrum due to t-channel Resonant Absorption by C$\nu$B
• The flavor composition of ultra-high-energy cosmic neutrinos: measurement forecasts for in-ice radio-based EeV neutrino telescopes
• Constraining the Mass Scale of a Lorentz-Violating Hamiltonian with the Measurement of Astrophysical Neutrino-Flavor Composition
• The spectrum and flavor composition of the astrophysical neutrinos in IceCube
• Early Decay of Peccei-Quinn Fermion and the IceCube Neutrino Events
• Supergravity Model of Inflation and Explaining IceCube HESE Data via PeV Dark Matter Decay
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• The Flavour Composition of the High-Energy IceCube Neutrinos
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• No Flavor Anisotropy in the High-Energy Neutrino Sky Upholds Lorentz Invariance