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25 April 2024

» arxiv » astro-ph/0601449

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Upper limit on the ultra-high-energy photon flux from AGASA and Yakutsk data
G.I. Rubtsov ; L.G. Dedenko ; G.F. Fedorova ; E.Yu. Fedunin ; A.V. Glushkov ; D.S. Gorbunov ; I.T. Makarov ; M.I. Pravdin ; T.M. Roganova ; I.E. Sleptsov ; S.V. Troitsky ;
Date:	19 Jan 2006
Journal:	Phys.Rev. D73 (2006) 063009
Abstract:	We 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.
Source:	arXiv, astro-ph/0601449
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