Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with theSurface Detector array of the Pierre Auger Observatory. We report here on searches through Augerdata from 1 January 2004 until 20 June 2013. No neutrino candidates were found, yielding a limitto the diffuse flux of ultra-high energy neutrinos that challenges the Waxman-Bahcall benchmarkpredictions. Neutrino identification is attempted using the broad time-structure of the signalsexpected in the SD stations, and is effciently done for neutrinos of all flavors interacting in the atmosphere at large zenith angles, as well as for "Earth-skimming" neutrino interactions in the caseof tau neutrinos. In this paper the searches for downward-going neutrinos in the zenith angle bins60°-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 ultra-high energy neutrinos with an E^-2 spectrum in the energy range 1.0 x 10^17 eV - 2.5 x 10^19 eV is Enu^2dNnu/dEnu < 6.4 x 10^-9 GeV cm^-2 s^-1 sr^-1.

Improved limit to the diffuse flux of ultrahigh energy neutrinos from the Pierre Auger Observatory

De Mitri I.;
2015

Abstract

Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with theSurface Detector array of the Pierre Auger Observatory. We report here on searches through Augerdata from 1 January 2004 until 20 June 2013. No neutrino candidates were found, yielding a limitto the diffuse flux of ultra-high energy neutrinos that challenges the Waxman-Bahcall benchmarkpredictions. Neutrino identification is attempted using the broad time-structure of the signalsexpected in the SD stations, and is effciently done for neutrinos of all flavors interacting in the atmosphere at large zenith angles, as well as for "Earth-skimming" neutrino interactions in the caseof tau neutrinos. In this paper the searches for downward-going neutrinos in the zenith angle bins60°-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 ultra-high energy neutrinos with an E^-2 spectrum in the energy range 1.0 x 10^17 eV - 2.5 x 10^19 eV is Enu^2dNnu/dEnu < 6.4 x 10^-9 GeV cm^-2 s^-1 sr^-1.
Ultra-high-energy cosmic rays and neutrinos; high-energy showers; ground detector arrays; Pierre Auger Observatory
File in questo prodotto:
File Dimensione Formato  
2015_PhysRevD_91_Aab.pdf

non disponibili

Descrizione: Articolo
Tipologia: Versione Editoriale (PDF)
Licenza: Non pubblico
Dimensione 553.05 kB
Formato Adobe PDF
553.05 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12571/2935
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 157
  • ???jsp.display-item.citation.isi??? 124
social impact