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Ahn, E. J.; Albuquerque, I. F. M.; Allekotte, I.; Ave, M.; Avenier, M.; Bäuml, J.; Berat, C.; Bertaina, M. E.; Brancus, I.; Caballero-Mora, K. S.; Caccianiga, B.; Chudoba, J.; Cocciolo, G.; Collica, L.; Contreras, F.; Dallier, R.; Daumiller, K.; Dawson, B. R.; de Jong, S. J.; del Peral, L.; Deligny, O.; Dobrigkeit, C.; Erdmann, M.; Farrar, G.; Fernandes, M.; Fox, B. D.; García, B.; Gómez Vitale, P. F.; Gookin, B.; Griffith, N.; Hansen, P.; Harton, J. L.; Holt, E.; Homola, P.; Jandt, I.; Johnsen, J. A.; Kasper, P.; Kégl, B.; Keivani, A.; Kemp, E.; Klages, H. O.; Krause, R.; Krohm, N.; Latronico, L.; Lauscher, M.; Lautridou, P.; Le Coz, S.; Letessier-Selvon, A.; Lhenry-Yvon, I.; López, R.; Lu, L.; Malacari, M.; Mariazzi, A. G.; Mariş, I. C.; Martin, L.; Matthews, J.; Matthiae, G.; Medina, C.; Menshikov, A.; Müller, S.; Nguyen, P. H.; Nitz, D.; Novotny, V.; Oikonomou, F.; Palatka, M.; Pech, M.; Pepe, I. M.; Piegaia, R.; Pierog, T.; Porcelli, A.; Prouza, M.; Roulet, E.; Rovero, A. C.; Salamida, F.; Santos, E. M.; Sarmento, R.; Scarso, C.; Schauer, M.; Schieler, H.; Scholten, O.; Sciutto, S. J.; Segreto, A.; Shadkam, A.; Sidelnik, I.; Sima, O.; Squartini, R.; Stapleton, J.; Tepe, A.; Theodoro, V. M.; Tomé, B.; Travnicek, P.; van Aar, G.; van Velzen, S.; Vargas Cárdenas, B.; Vázquez, J. R.; Vlcek, B.; Yushkov, A.; Zavrtanik, M.; Zepeda, A.; Ziolkowski, M.
Physical review. D, Particles, fields, gravitation, and cosmology, 05/2015, Letnik: 91, Številka: 9Journal Article
The Pierre Auger Collaboration reports on its search for ultra high energy (UHE) neutrinos in the EeV range, three orders of magnitude above the highest energy neutrino events reported by IceCube. Analyzing over 9 years of data, the collaboration found no events, setting the strictest limits to date on the diffuse flux of UHE neutrinos. Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with the Surface Detector array (SD) of the Pierre Auger Observatory. We report here on searches through Auger data from 1 January 2004 until 20 June 2013. No neutrino candidates were found, yielding a limit to the diffuse flux of ultrahigh energy neutrinos that challenges the Waxman-Bahcall bound predictions. Neutrino identification is attempted using the broad time structure of the signals expected in the SD stations, and is efficiently done for neutrinos of all flavors interacting in the atmosphere at large zenith angles, as well as for "Earth-skimming" neutrino interactions in the case of tau neutrinos. In this paper the searches for downward-going neutrinos in the zenith angle bins 60degrees-75degrees and 75degrees-90degrees 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 ultrahigh energy neutrinos with an E super(-2) spectrum in the energy range 1.0 x 10 super(17) eV -2.5 x 10 super(19) eV is (ProQuest: Formulae and/or non-USASCII text omitted) GeV cm super(-2) s super(-1) sr super(-1).
