<p>Recently, the KM3NeT experiment reported the detection of a neutrino with exceptionally high energy <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(E = 220\)</EquationSource> <!--JETPLet2561006Kuznetsov-m1--> </InlineEquation> PeV, whose origin remains unclear. The corresponding value of the neutrino flux is in tension with the results of other high-energy neutrino experiments. In this study, we discuss the possibility that this neutrino is cosmogenic, i.e., produced by ultra-high energy cosmic rays during their propagation through the intergalactic medium. We adopt the ultra-high energy cosmic rays flux models derived by the Telescope Array experiment, which features a predominantly light mass composition. We show that the predictions of the cosmogenic neutrino flux in these models are consistent with the measurements of the KM3NeT-only and with that of the “global neutrino observatory” at approximately <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(2\sigma \)</EquationSource> <!--JETPLet2561006Kuznetsov-m2--> </InlineEquation> level. Notably, this result is achieved in a minimal version of the ultra-high energy cosmic rays flux models, that assume one source population with a standard cosmological evolution. We also estimate the corresponding cosmogenic gamma-ray flux and show that it is consistent with Fermi-LAT Isotropic Diffuse Gamma-Ray Background measurements and ultra-high energy gamma-ray limits; the improvement of the latter can probe these predictions in future.</p>

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Ultra-High Energy Event KM3-230213A as a Cosmogenic Neutrino in Light of Minimal UHECR Flux Models

  • M. Yu. Kuznetsov,
  • N. A. Petrov,
  • Y. S. Savchenko

摘要

Recently, the KM3NeT experiment reported the detection of a neutrino with exceptionally high energy \(E = 220\) PeV, whose origin remains unclear. The corresponding value of the neutrino flux is in tension with the results of other high-energy neutrino experiments. In this study, we discuss the possibility that this neutrino is cosmogenic, i.e., produced by ultra-high energy cosmic rays during their propagation through the intergalactic medium. We adopt the ultra-high energy cosmic rays flux models derived by the Telescope Array experiment, which features a predominantly light mass composition. We show that the predictions of the cosmogenic neutrino flux in these models are consistent with the measurements of the KM3NeT-only and with that of the “global neutrino observatory” at approximately \(2\sigma \) level. Notably, this result is achieved in a minimal version of the ultra-high energy cosmic rays flux models, that assume one source population with a standard cosmological evolution. We also estimate the corresponding cosmogenic gamma-ray flux and show that it is consistent with Fermi-LAT Isotropic Diffuse Gamma-Ray Background measurements and ultra-high energy gamma-ray limits; the improvement of the latter can probe these predictions in future.