The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau neutrinos that interact in Earth’s crust. Tau leptons from ντ charged-current interactions can emerge and decay in the atmosphere to produce a nearly horizontal shower with a significant electromagnetic component. The data collected between 1 January 2004 and 31 August 2007 are used to place an upper limit on the diffuse flux of ντ at EeV energies. Assuming an Eν-2 differential energy spectrum the limit set at 90% C.L. is Eν^2dNντ/dEν<1.3×10^-7  GeV cm-2 s-1 sr-1 in the energy range 2×10^17  eV<Eν<2×10^19  eV.
Upper limit on the diffuse flux of ultrahigh energy tau neutrinos from the Pierre Auger Observatory / Guarino, Fausto; D'Urso, Domenico; M., Ambrosio; Aramo, Carla; DELLA SELVA, Angelo; Miele, Gennaro; Pisanti, Ofelia; Valore, Laura; Auger, Collaboration. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 100:(2008), pp. 211101-1-211101-7. [10.1103/PhysRevLett.100.211101]
Upper limit on the diffuse flux of ultrahigh energy tau neutrinos from the Pierre Auger Observatory
GUARINO, FAUSTO;D'URSO, DOMENICO;ARAMO, CARLA;DELLA SELVA, ANGELO;MIELE, GENNARO;PISANTI, OFELIA;VALORE, LAURA;
2008
Abstract
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau neutrinos that interact in Earth’s crust. Tau leptons from ντ charged-current interactions can emerge and decay in the atmosphere to produce a nearly horizontal shower with a significant electromagnetic component. The data collected between 1 January 2004 and 31 August 2007 are used to place an upper limit on the diffuse flux of ντ at EeV energies. Assuming an Eν-2 differential energy spectrum the limit set at 90% C.L. is Eν^2dNντ/dEν<1.3×10^-7 GeV cm-2 s-1 sr-1 in the energy range 2×10^17 eV| File | Dimensione | Formato | |
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