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

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

2006-01-19

arxiv.org/abs/astro-ph/0601449v1

Phys.Rev.D73:063009,2006

Astronomy and Astrophysics

Astrophysics

revtex, 8 pages, 4 figures

Scientific paper

10.1103/PhysRevD.73.063009

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.

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