Upper limit on the ultra-high-energy photon flux from AGASA and Yakutsk data

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dc.creatorRubtsov, G. I.
dc.creatorDedenko, L. G.
dc.creatorFedorova, G. F.
dc.creatorFedunin, E. Yu.
dc.creatorGlushkov, A. V.
dc.creatorGorbunov, D. S.
dc.creatorMakarov, I. T.
dc.creatorPravdin, M. I.
dc.creatorRoganova, T. M.
dc.creatorSleptsov, I. E.
dc.creatorTroitsky, S. V.
dc.date2006-01-19
dc.date.accessioned2026-07-07T11:42:29Z
dc.date.available2026-07-07T11:42:29Z
dc.descriptionWe present the interpretation of the muon and scintillation signals of ultra-high-energy air showers observed by AGASA and Yakutsk extensive air shower array experiments. We consider case-by-case ten highest energy events with known muon content and conclude that at the 95% confidence level (C.L.) none of them was induced by a primary photon. Taking into account statistical fluctuations and differences in the energy estimation of proton and photon primaries, we derive an upper limit of 36% at 95% C.L. on the fraction of primary photons in the cosmic-ray flux above 10^20 eV. This result disfavors the Z-burst and superheavy dark-matter solutions to the GZK-cutoff problem.
dc.descriptionrevtex, 8 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0601449
dc.identifierhttp://arxiv.org/abs/astro-ph/0601449
dc.identifierPhys.Rev.D73:063009,2006
dc.identifierdoi:10.1103/PhysRevD.73.063009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200901
dc.subjectAstrophysics
dc.titleUpper limit on the ultra-high-energy photon flux from AGASA and Yakutsk data
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