{"paper":{"title":"Search for photons with energies above 10$^{18}$ eV using the hybrid detector of the Pierre Auger Observatory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"astro-ph.HE","authors_text":"A. Almela, A.A. Watson, A. Balaceanu, A. Blanco, A. Bridgeman, A. Bueno, A. Cancio, A. Castellina, A.C. Fauth, A. Coleman, A.C. Rovero, A. Di Matteo, A.D. Supanitsky, A. Dundovic, A.E. Herve, A. Etchegoyen, A.F. Grillo, A. Filip\\v{c}i\\v{c}, A. Fuster, A.G. Chavez, A. Gherghel-Lascu, A.G. Mariazzi, A. Gorgi, A. Haungs, A. Insolia, A. K\\\"a\\\"ap\\\"a, A. Kuotb Awad, A. Letessier-Selvon, A.L. M\\\"uller, A. L\\'opez Casado, A. Lucero, A.M. Badescu, A.M. Botti, A. Menshikov, A.M. van den Berg, A. Olinto, A. Parra, A. Saftoiu, A. Saleh, A. Schulz, A. Segreto, A. Shadkam, A. \\'Smia{\\l}kowski, A. Taboada, A. Tapia, A. van Vliet, A. Weindl, A. Yushkov, A. Zepeda, B. Andrada, B. Daniel, B. Fick, B. Garc\\'ia, B. Keilhauer, B. Mitrica, B.R. Dawson, B. Revenu, B. Tom\\'e, B. Vargas C\\'ardenas, B. Wundheiler, B. Zimmermann, C. Aramo, C.A. Sarmiento, C. Berat, C. Bleve, C. Bonifazi, C. Di Giulio, C. Dobrigkeit, C.E. Covault, C. Glaser, C. Hojvat, C.J. Todero Peixoto, C. Medina, C. Morello, C.O. Escobar, C. Peters, C. Porowski, C. Timmermans, D. Boncioli, D. Garcia-Pinto, D. G{\\l}as, D. Harari, D. Heck, D. Kuempel, D. LaHurd, D. Mandat, D. Martello, D. Melo, D. Mockler, D. Nitz, D. Nosek, D. Ravignani, D. Rogozin, D. Schmidt, D. Stanca, D. Veberi\\v{c}, D. Walz, D. Wittkowski, D. Yelos, D. Zavrtanik, E. Holt, E.J. Quel, E. Kemp, E. Mayotte, E.M. Santos, E. Roulet, E. Santos, E. Varela, E. Zas, F. Arqueros, F. Canfora, F. Contreras, F. Diogo, F. Gat\\'e, F.G. Schr\\\"oder, F. Guarino, F.L. Briechle, F. Montanet, F. Oikonomou, F. Pedreira, F. Salamida, F. Salesa Greus, F. S\\'anchez, F. Sarazin, F. Strafella, F. Suarez, F. Zuccarello, G.A. Anastasi, G. Avila, G. Cataldi, G.C. Hill, G. De Mauro, G. Farrar, G. Golup, G. Kukec Mezek, G. Marsella, G. Matthiae, G. Medina-Tanco, G. M\\\"uller, G. Parente, G.P. Guedes, G. Rodriguez Fernandez, G.R. Snow, G. Salina, G. Sigl, G. Silli, G. Torralba Elipe, G. van Aar, G. Varner, H. Asorey, H. Falcke, H. Gemmeke, H.J. Mathes, H. Martinez, H. No\\v{z}ka, H.O. Klages, H. Salazar, H. Schieler, H. Wahlberg, H. Wilczy\\'nski, I. Allekotte, I. Al Samarai, I.A. Minaya, I. Brancus, I.C. Mari\\c{s}, I. De Mitri, I.D. Vergara Quispe, I.F.M. Albuquerque, I. Jandt, I. Katkov, I. Lhenry-Yvon, I. Naranjo, I. Vali\\~no, J.A. Bellido, J.A. Chinellato, J.A.J. Matthews, J.A. Johnsen, J. Alvarez Castillo, J. Alvarez-Mu\\~niz, J. Aublin, J. Biteau, J. Blazek, J. Brack, J.C. D'Olivo, J. Chudoba, J. Cronin, J. Debatin, J. de Oliveira, J. Ebr, J. Espadanal, J.F. Vald\\'es Galicia, J. Hulsman, J.J. Beatty, J.J. Mas\\'ias Meza, J. Kemp, J. Kleinfeller, J.L. Harton, J. Matthews, J.M. Figueira, J. Pallotta, J. Pe\\~na-Rodriguez, J. Phuntsok, J. P\\k{e}kala, J. Rautenberg, J.R. H\\\"orandel, J. Ridky, J. Rodriguez Rojo, J.R.T. de Mello Neto, J.R. V\\'azquez, J. Schulz, J. Schumacher, J. Sorokin, J. Stasielak, J. Swain, J. Vicha, K. Daumiller, K.H. Becker, K.H. Kampert, K. Link, K.S. Caballero-Mora, L. Anchordoqui, L.A. N\\'u\\~nez, L. A. S. Pereira, L. Caccianiga, L. Caramete, L. Cazon, L. Collica, L. Lopes, L. Middendorf, L. Miramonti, L. Nellen, L. Niemietz, L. Ochilo, L. Perrone, L. Tomankova, L. Valore, L. Villase\\~nor, L. Wiencke, L. Yang, M. Aglietta, M.A. Leigui de Oliveira, M.A. Muller, M. Boh\\'a\\v{c}ov\\'a, M. Buscemi, M.E. Bertaina, M. Erdmann, M. Erfani, M. Giammarchi, M. Giller, M. G\\'omez Berisso, M. Hrabovsk\\'y, M.I. Micheletti, M.J. Cooper, M. Josebachuili, M.J. Roncoroni, M. Kleifges, M. Lauscher, M.L. D\\'iaz Castro, M. Malacari, M. Mallamaci, M.M. Freire, M. Mostaf\\'a, M. Niculescu-Oglinzanu, M. Niechciol, M. Palatka, M. Pech, M. Perl\\'in, M. Pimenta, M. Platino, M. Plum, M. Prouza, M.R. Coluccia, M.R. Hampel, M. Risse, M. Roth, M. Schauer, M. Schimp, M. Settimo, M. Suarez Dur\\'an, M.T. Dova, M. Trini, M. Unger, M. Urban, M. Weber, M. Wirtz, M. Zavrtanik, M. Ziolkowski, N. Arsene, N. Borodai, N. Fazzini, N. Gonz\\'alez, N. Krohm, N. Kunka, O.A. Taborda, O. Deligny, O. Fratu, O. Kambeitz, O. Mart\\'inez Bravo, O. Scholten, O. Sima, O. Wainberg, P. Abreu, P. Assis, P. Billoir, P. Buchholz, P.F. G\\'omez Vitale, P.G. Isar, P. Gorham, P. Hansen, P. Heimann, P.H. Nguyen, P. Homola, P. Horvath, P.L. Biermann, P.L. Ghia, P. Mantsch, P.O. Mazur, P. Papenbreer, P. Pieroni, P. Privitera, P. Ristori, P. Ruehl, P. Sanchez-Lucas, P. Schov\\'anek, P. Sommers, P. Stassi, P. Travnicek, P. van Bodegom, Q. Dorosti, Q. Luce, R.A. V\\'azquez, R. Caruso, R.C. dos Anjos, R. Colalillo, R. Concei\\c{c}\\~ao, R.C. Shellard, R. Engel, R. Gaior, R.J. Barreira Luz, R. Krause, R. Legumina, R. L\\'opez, R.M. de Almeida, R.M. Kieckhafer, R. Mussa, R. Pelayo, R. Piegaia, R. Ramos-Pollan, R.R. Prado, R. Sarmento, R. Sato, R. Squartini, R. Ulrich, R. \\v{S}m\\'ida, R.W. Clay, S. Andringa, S. Buitink, S. Coutu, S. D'Amico, S. Dasso, S.G. Blaess, S. Jansen, S.J. De Jong, S.J. Saffi, S.J. Sciutto, S. Mathys, S. Mollerach, S. M\\\"uller, S. Petrera, S. Querchfeld, S. Quinn, S. Sonntag, S. Stani\\v{c}, S. Vorobiov, T.A. Harrison, T. Bretz, T.D. Grubb, T. Fujii, T. Hebbeker, The Pierre Auger Collaboration: A. Aab, T. Huege, T. Niggemann, T. Paul, T. Pierog, T. Sudholz, T. Suomij\\\"arvi, T. Winchen, U. Giaccari, V. de Souza, V.M. Theodoro, V. Novotny, V. Pirronello, V. Rizi, V. Scherini, V. Verzi, W. Rodrigues de Carvalho, X. Bertou, Z. Szadkowski, Z. Zong","submitted_at":"2016-12-05T20:59:34Z","abstract_excerpt":"A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1 - 2 EeV are found, which is compatible with the expected hadron-induced background. Upper limits on the integral flux of ultra-high e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.01517","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1612.01517/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}