Search for ultrahigh energy neutrinos in highly inclined events at the Pierre Auger Observatory Pierre Auger Collaboration Bueno Villar, Antonio Gascón Bravo, Alberto Lozano Bahílo, Julio Molina-Bueno, Laura Navarro, J. L. Navas Concha, Sergio Zamorano García, Bruno Ultra-high energy cosmic rays Pierre Auger Observatory Erratum: Phys. Rev. D 85, 029902(E) (2012) [http://dx.doi.org/10.1103/PhysRevD.85.029902] The Surface Detector of the Pierre Auger Observatory is sensitive to neutrinos of all flavours above 0.1 EeV. These interact through charged and neutral currents in the atmosphere giving rise to extensive air showers. When interacting deeply in the atmosphere at nearly horizontal incidence, neutrinos can be distinguished from regular hadronic cosmic rays by the broad time structure of their shower signals in the water-Cherenkov detectors. In this paper we present for the first time an analysis based on down-going neutrinos. We describe the search procedure, the possible sources of background, the method to compute the exposure and the associated systematic uncertainties. No candidate neutrinos have been found in data collected from 1 January 2004 to 31 May 2010. Assuming an E^-2 differential energy spectrum the limit on the single flavour neutrino is (E^2 * dN/dE) < 1.74x10^-7 GeV cm^-2 s^-1 sr^-1 at 90% C.L. in the energy range 1x10^17 eV < E < 1x10^20 eV. 2013-11-11T13:52:02Z 2013-11-11T13:52:02Z 2011 info:eu-repo/semantics/preprint Pierre Auger Collaboration. Search for ultrahigh energy neutrinos in highly inclined events at the Pierre Auger Observatory. Physical Review D, 84(12): 122005 (2011). [http://hdl.handle.net/10481/29094] 1550-7998 1550-2368 doi: 10.1103/PhysRevD.84.122005 arXiv:1202.1493v1 http://hdl.handle.net/10481/29094 eng info:eu-repo/grantAgreement/EC/FP7/220240 http://creativecommons.org/licenses/by-nc-nd/3.0/ info:eu-repo/semantics/openAccess Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License American Physical Society