{
  "id": "1407.3591",
  "version": "v2",
  "published": "2014-07-14T10:17:24.000Z",
  "updated": "2014-12-17T12:22:21.000Z",
  "title": "High-energy neutrino fluxes and flavor ratio in the Earth atmosphere",
  "authors": [
    "T. S. Sinegovskaya",
    "A. D. Morozova",
    "S. I. Sinegovsky"
  ],
  "comment": "8 pages, 6 eps figures, 4 tables, LaTeX; revised version expanded to 12 pages, added new section, one figure, 19 references; updated abstract, sections 1-4, figures 1,4-6; corrected uncovered errors and typos; unchanged results and conclusions",
  "categories": [
    "astro-ph.HE",
    "hep-ex",
    "hep-ph"
  ],
  "abstract": "We calculate the atmospheric neutrino fluxes in the energy range 100 GeV - 10 PeV with usage of several known hadronic models and few parametrizations of the cosmic ray spectra which take into account the knee. The calculations are compared with the atmospheric neutrino measurements by Frejus, AMANDA, IceCube and ANTARES. An analitic description is presented for the zenith-angle averaged conventional ($\\nu_\\mu+\\bar\\nu_\\mu$) and ($\\nu_e+\\bar\\nu_e$) energy spectra, which can be used to obtain test data of the neutrino event reconstruction in neutrino telescopes. The sum of the calculated atmospheric $\\nu_\\mu$ flux and the IceCube best-fit astrophysical flux gives the evidently higher flux as compared to the IceCube59 data, giving rise the question concerning the hypothesis of the equal flavor composition of the high-energy astrophysical neutrino flux. Calculations show that the transition from the atmospheric electron neutrino flux to the predominance of the astrophysical neutrinos occurs probably at 30-100 TeV, if the prompt neutrino component is taken into consideration. The neutrino flavor ratio, extracted from the IceCube data, does not reveal a trend to rise as it is expected for the conventional neutrino flux in the energy range 100 GeV - 30 TeV. The depression of the ratio $R_{\\nu_\\mu/\\nu_e}$ probably indicates that the atmospheric electron neutrino flux obtained in the IceCube experiment contains an admixture of the astrophysical neutrinos in the range 10-50 TeV.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-07-14T10:17:24.000Z",
      "abstract": "High-energy neutrinos from decays of mesons, produced in collisions of cosmic-ray particles with air nuclei, form unavoidable background for detection of astrophysical neutrinos. More precise calculations of the high-energy neutrino spectrum are required since measurements in the IceCube experiment reach the intriguing energy range where a contribution of the prompt neutrinos and/or astrophysical ones should be uncovered. The calculation of muon and electron neutrino fluxes in the energy range 100 GeV - 10 PeV is performed for three hadronic models, QGSJET II, SIBYll 2.1 and Kimel & Mokhov, taking into consideration the \"knee\" of the cosmic-ray spectrum. All calculations are compared with the atmospheric neutrino measurements by Frejus, AMANDA, IceCube and ANTARES. The prompt neutrino flux predictions obtained with the quark-gluon string model (QGSM) for the charm production by Kaidalov & Piskunova do not contradict to the measurements and upper limits on the astrophysical muon neutrino flux obtained with neutrino telescopes. The diffuse flux of astrophysical neutrinos related to the high-energy neutrino events in the IceCube experiment leads presumably to the flavor ratio decrease at the energy above 10 TeV. An extrapolation of the diffuse PeV neutrino flux to the energy range below 30 TeV shows the consistency of calculated neutrino flavor ratio and that of obtained from the IceCube data. The computation makes it clear that confirmation of astrophysical origin for high-energy neutrino events might be obtained from little progress in measurement of $\\nu_e$ spectrum above 10 TeV, where the flavor ratio, responsive to changes in the electron neutrino flux, allows to reveal a small fraction from astrophysical sources.",
      "comment": "8 pages, 6 figures, 4 tables",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2014-12-17T12:22:21.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "95.85.Ry",
      "13.85.-t",
      "95.55.Vj"
    ],
    "keywords": [
      "flavor ratio",
      "high-energy neutrino fluxes",
      "earth atmosphere",
      "high-energy neutrino events",
      "energy range"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1103/PhysRevD.91.063011",
      "journal": "Physical Review D",
      "year": 2015,
      "month": "Mar",
      "volume": 91,
      "number": 6,
      "pages": "063011"
    },
    "note": {
      "typesetting": "LaTeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1306255,
      "adsabs": "2015PhRvD..91f3011S"
    }
  }
}