INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Limits on the diffuse flux of ultra high energy neutrinos set using the Pierre Auger Observatory
THE PIERRE AUGER COLLABORATION (AUTOR 434 DE 474); M. TUEROS
Conferencia; 31st International Cosmic Ray Conference; 2009
The array of water-Cherenkov detectors of the Pierre Auger Observatory is sensitive to neutrinos of > 1 EeV of all flavours. These interact through charged and neutral currents in the atmosphere (down-going) and, for tau neutrinos, through the Earth skimming mechanism (up-going). Both types of neutrinos can be identified by the presenceof a broad time structure of signals in the water-Cherenkov detectors in the inclined showers that they induce when interacting close to ground. Using data collected from 1 January 2004 to 28 February 2009, we present for the first time an analysis based on down-going neutrinos and place a competitive limit on the all-flavour diffuse neutrino flux. We alsoupdate the previous limit for up-going tau neutrinos. Sources of possible backgrounds and systematic uncertainties are discussed.