Published May 26, 2015
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Improved limit to the diffuse flux of ultrahigh energy neutrinos from the Pierre Auger Observatory

Creators

  • 1. University of Siegen
  • 2. University of Lisbon
  • 3. University of Turin
  • 4. Fermilab
  • 5. Université Paris-Saclay
  • 6. University of São Paulo
  • 7. Ohio State University
  • 8. National Technological University
  • 9. National University of General San Martín
  • 10. National Autonomous University of Mexico
  • 11. University of Santiago de Compostela
  • 12. University of Hamburg
  • 13. University of Naples Federico II
  • 14. Radboud University Nijmegen
  • 15. City University of New York
  • 16. Complutense University of Madrid
  • 17. University of Bucharest
  • 18. Industrial University of Santander
  • 19. University of Grenoble
  • 20. New York University
  • 21. Politehnica University of Bucharest
  • 22. University of Adelaide
  • 23. Karlsruhe Institute of Technology
  • 24. University of Wuppertal
  • 25. Max Planck Society
  • 26. University of Salento
  • 27. Academy of Sciences of the Czech Republic
  • 28. Federal University of Rio de Janeiro
  • 29. Polish Academy of Sciences
  • 30. Colorado State University
  • 31. Colorado State University–Pueblo
  • 32. University of Granada
  • 33. University of Milan
  • 34. University of Rome Tor Vergata
  • 35. University of Catania
  • 36. Universidad Michoacana de San Nicolás de Hidalgo
  • 37. State University of Campinas
  • 38. Pennsylvania State University
  • 39. Case Western Reserve University
  • 40. University of Chicago
  • 41. Centre national de la recherche scientifique
  • 42. University of Nantes
  • 43. University of Buenos Aires
  • 44. Federal Fluminense University
  • 45. University of Alcalá
  • 46. Michigan Technological University
  • 47. University of L'Aquila
  • 48. University of Groningen
  • 49. National University of La Plata
  • 50. RWTH Aachen University
  • 51. ASTRON
  • 52. University of Nova Gorica
  • 53. State University of Feira de Santana
  • 54. Colorado School of Mines
  • 55. University of New Mexico
  • 56. Universidade Federal do ABC
  • 57. Benemérita Universidad Autónoma de Puebla
  • 58. University of Leeds
  • 59. CINVESTAV
  • 60. Louisiana State University
  • 61. Universidade Federal de Pelotas
  • 62. Charles University in Prague
  • 63. Northeastern University
  • 64. Instituto Politécnico Nacional
  • 65. Federal University of Bahia
  • 66. University of Nebraska–Lincoln
  • 67. INAF

Description

Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with the Surface Detector array (SD) of the Pierre Auger Observatory. We report here on searches through Auger data from 1 January 2004 until 20 June 2013. No neutrino candidates were found, yielding a limit to the diffuse flux of ultrahigh energy neutrinos that challenges the Waxman-Bahcall bound predictions. Neutrino identification is attempted using the broad time structure of the signals expected in the SD stations, and is efficiently done for neutrinos of all flavors interacting in the atmosphere at large zenith angles, as well as for "Earth-skimming" neutrino interactions in the case of tau neutrinos. In this paper the searches for downward-going neutrinos in the zenith angle bins 60°-75°and 75°-90°as well as for upward-going neutrinos, are combined to give a single limit. The 90% C.L. single-flavor limit to the diffuse flux of ultrahigh energy neutrinos with an E-2 spectrum in the energy range 1.0×1017eV-2.5×1019eV is Eν2dNν/dEν<6.4×10-9GeVcm-2s-1sr-1.
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