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An upper limit to the photon fraction in cosmic rays above 10^19 eV from the Pierre Auger Observatory

By J. Abraham, M. Aglietta, C. Aguirre, D. Allard, I. Allekotte, P. Allison, C. Alvarez, J. Alvarez-Muniz, M. Ambrosio, L. Anchordoqui, J.C. Anjos, C. Aramo, K. Arisaka, E. Armengaud, F. Arneodo, F. Arqueros, T. Asch, H. Asorey, B.S. Atulugama, J. Aublin, M. Ave, G. Avila, J. Bacelar, T. Backer, D. Badagnani, A.F. Barbosa, H.M.J. Barbosa, M. Barkhausen, D. Barnhill, S.L.C. Barroso, P. Bauleo, J. Beatty, T. Beau, B.R. Becker, K.H. Becker, J.A. Bellido, S. Benzvi, C. Berat, T. Bergmann, P. Bernardini, X. Bertou, P.L. Biermann, P. Billoir, O. Blanch-Bigas, F. Blanco, P. Blasi, C. Bleve, H. Blumer, P. Boghrat, M. Bohacova, C. Bonifazi, R. Bonino, M. Boratav, J. Brack, J.M. Brunet, P. Buchholz, N.G. Busca, K.S. Caballero-Mora, B. Cai, D.V. Camin, J.-N. Capdevielle, R. Caruso, A. Castellina, G. Cataldi, L. Cazon, R. Cester, J. Chauvin, A. Chiavassa, J.A. Chinellato, A. Chou, J. Chye, D. Claes, P.D.J. Clark, R.W. Clay, S.B. Clay, B. Connolly, A. Cordier, U. Cotti, S. Coutu, C.E. Covault, J. Cronin, S. Dagoret-Campagne, T. Dang Quang, P. Darriulat, K. Daumiller, B.R. Dawson, R.M. De Almeida, L.A. De Carvalho, C. De Donato, S.J. De Jong, W.J.M. De Mello Junior, J.R.T. De Mello Neto, I. De Mitri, M.A.L. De Oliveira, V. De Souza, L. Del Peral, O. Deligny, A. Della Selva, C. Delle Fratte, H. Dembinski, C. Di Giulio, J.C. Diaz, C. Dobrigkeit, J.C. D'Olivo, D. Dornic, A. Dorofeev, M.T. Dova, D. D'Urso, M.A. Duvernois, R. Engel, L. Epele, M. Erdmann, C.O. Escobar, A. Etchegoyen, A. Ewers, P. Facal San Luis, H. Falcke, A.C. Fauth, D. Fazio, N. Fazzini, Arnaud Fernandez, F. Ferrer, S. Ferry, B. Fick, A. Filevich, A. Filipcic, I. Fleck, E. Fokitis, R. Fonte, D. Fuhrmann, W. Fulgione, B. Garcia, D. Garcia-Pinto, L. Garrard, X. Garrido, H. Geenen, G. Gelmini, H. Gemmeke, A. Geranios, P.L. Ghia, M. Giller, J. Gitto, H. Glass, F. Gobbi, M.S. Gold, F. Gomez Albarracin, M. Gomez Berisso, R. Gomez Herrero, M. Goncalves Do Amaral, J.P. Gongora, D. Gonzalez, J.G. Gonzalez, M. Gonzalez, D. Gora, A. Gorgi, P. Gouffon, V. Grassi, A. Grillo, C. Grunfeld, C. Grupen, F. Guarino, G.P. Guedes, J. Gutierrez, J.D. Hague, J.-C. Hamilton, M.N. Harakeh, D. Harari, S. Harmsma, S. Hartmann, J.L. Harton, M.D. Healy, T. Hebbeker, D. Heck, C. Hojvat, P. Homola, J. Horandel, A. Horneffer, M. Horvat, M. Hrabovsky, M. Iarlori, A. Insolia, M. Kaducak, O. Kalashev, K.H. Kampert, B. Keilhauer, E. Kemp, H.O. Klages, M. Kleifges, J. Kleinfeller, R. Knapik, J. Knapp, D.H. Koang, Y. Kolotaev, A. Kopmann, O. Kromer, S. Kuhlman, J. Kuijpers, N. Kunka, A. Kusenko, C. Lachaud, B.L. Lago, D. Lebrun, P. Lebrun, J. Lee, A. Letessier-Selvon, M. Leuthold, I. Lhenry-Yvon, G. Longo, R. Lopez, A. Lopez Aguera, A. Lucero, S. Maldera, M. Malek, S. Maltezos, G. Mancarella, M.E. Mancenido, D. Mandat, P. Mantsch, A.G. Mariazzi, I.C. Maris, D. Martello, N. Martinez, J. Martinez, O. Martinez, H.J. Mathes, J. Matthews, J.A.J. Matthews, G. Matthiae, G. Maurin, D. Maurizio, P.O. Mazur, T. McCauley, M. McEwen, R.R. McNeil, G. Medina, M.C. Medina, G. Medina Tanco, A. Meli, D. Melo, E. Menichetti, A. Menshikov, Chr. Meurer, R. Meyhandan, M.I. Micheletti, G. Miele, W. Miller, S. Mollerach, M. Monasor, D. Monnier Ragaigne, F. Montanet, B. Morales, C. Morello, E. Moreno, C. Morris, M. Mostafa, M.A. Muller, R. Mussa, G. Navarra, L. Nellen, C. Newman-Holmes, D. Newton, T. Nguyen Thi, R. Nichol, N. Nierstenhofer, D. Nitz, H. Nogima, D. Nosek, L. Nozka, J. Oehlschlager, T. Ohnuki, A. Olinto, L.F.A. Oliveira, V.M. Olmos-Gilbaja, M. Ortiz, S. Ostapchenko, L. Otero, M. Palatka, J. Pallotta, G. Parente, E. Parizot, S. Parlati, M. Patel, T. Paul, K. Payet, M. Pech, J. Pekala, R. Pelayo, I.M. Pepe, L. Perrone, S. Petrera, P. Petrinca, Y. Petrov, D. Pham Ngoc, T.N. Pham Thi, R. Piegaia, T. Pierog, O. Pisanti, T.A. Porter, J. Pouryamout, L. Prado Junior, P. Privitera, M. Prouza, E.J. Quel, J. Rautenberg, H.C. Reis, S. Reucroft, Benoît Revenu, J. Ridky, A. Risi, M. Risse, C. Rivière, V. Rizi, S. Robbins, M. Roberts, C. Robledo, G. Rodriguez, D. Rodriguez Frias, J. Rodriguez Martino, J. Rodriguez Rojo, G. Ros, J. Rosado, M. Roth, C. Roucelle, B. Rouille-D'Orfeuil, E. Roulet, A.C. Rovero, F. Salamida, H. Salazar, G. Salina, F. Sanchez, M. Santander, E.M. Santos, S. Sarkar, R. Sato, V. Scherini, T. Schmidt, O. Scholten, P. Schovanek, F. Schussler, S.J. Sciutto, M. Scuderi, D.V. Semikoz, G. Sequeiros, R.C. Shellard, B.B. Siffert, G. Sigl, P. Skelton, W. Slater, N. Smetniansky De Grande, A. Smialkowski, R. Smida, B.E. Smith, G.R. Snow, P. Sokolsky, P. Sommers, J. Sorokin, H. Spinka, E. Strazzeri, A. Stutz, F. Suarez, T. Suomijarvi, A.D. Supanitsky, J. Swain, Z. Szadkowski, A. Tamashiro, A. Tamburro, O. Tascau, R. Ticona, C. Timmermans, W. Tkaczyk, C.J. Todero Peixoto, A. Tonachini, D. Torresi, P. Travnicek, A. Tripathi, G. Tristram, D. Tscherniakhovski, M. Tueros, V. Tunnicliffe, R. Ulrich, M. Unger, Martin Urban, J.F. Valdes Galicia, I. Valino, L. Valore, A.M. Van Den Berg, V. Van Elewyck, R.A. Vazquez, D. Veberic, A. Veiga, A. Velarde, T. Venters, V. Verzi, M. Videla, L. Villasenor, T. Vo Van, S. Vorobiov, L. Voyvodic, H. Wahlberg, O. Wainberg, T. Waldenmaier, P. Walker, D. Warner, A.A. Watson, S. Westerhoff, C. Wiebusch, G. Wieczorek, L. Wiencke, B. Wilczynska, H. Wilczynski, C. Wileman, M.G. Winnick, J. Xu, T. Yamamoto, P. Younk, E. Zas, D. Zavrtanik, M. Zavrtanik, A. Zech, A. Zepeda, M. Zha and M. Ziolkowski

Abstract

31 pages, 11 figures, 2 tables. Minor changes, appendix expanded, conclusions unchanged; accepted by Astroparticle PhysicsAn upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10^19 eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by observing the fluorescence light profile of air showers. This upper limit confirms and improves on previous results from the Haverah Park and AGASA surface arrays. Additional data recorded with the Auger surface detectors for a subset of the event sample, support the conclusion that a photon origin of the observed events is not favored

Topics: [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [SDU.ASTR.CO] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]
Publisher: Elsevier
Year: 2007
DOI identifier: 10.1016/j.astropartphys.2006.10.004
OAI identifier: oai:HAL:in2p3-00121304v1
Provided by: Hal-Diderot
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