Ultra-High Energy Neutrinos at the Pierre Auger Observatory

THE PIERRE AUGER COLLABORATION.; S. J. SCIUTTO

Conferencia; 33rd International Cosmic Ray Conference; 2013

Neutrinos in the sub-EeV energy range and above can be detected with the Surface Detector array (SD)of the Pierre Auger Observatory. They can be identified through the broad time-structure of the signals expected tobe induced in the SD stations. The identification can be efficiently done for neutrinos of all flavours interactingin the atmosphere at large zenith angles, typically above 60 (downward-going), as well as for Earth-skimmingneutrino interactions in the case of tau neutrinos (upward-going). The wide angular range calls naturally for threesets of identification criteria designed to search for downward-going neutrinos in the zenith angle bins 60 􀀀 75and 75 􀀀 90 as well as for upward-going neutrinos. In this contribution the three searches are combined to givea single limit, providing, in the absence of candidates in data from 1 January 04 until 31 December 12, an updatedand stringent limit to the diffuse flux of ultra-high energy neutrinos.