Double Pair Production by Ultra High Energy Cosmic Ray Photons

Abstract

With use of CompHEP package we've made the detailed estimate of the influence of double e+e- pair production by photons (DPP) on the propagation of ultra high energy electromagnetic cascade. We show that in the models in which cosmic ray photons energy reaches few thousand EeV refined DPP analysis may lead to substantial difference in predicted photon spectrum compared to previous rough estimates.

12 pages, 5 figures (misprints removed, 2 additional figures added in ver. 2)

References in corpus (2)

• Upper limit on the ultra-high-energy photon flux from AGASA and Yakutsk data
• Constraining the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk extensive-air-shower array

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• Neutrinos from muon-rich ultra high energy electromagnetic cascades: The MUNHECA code
• Revisiting the propagation of highly-energetic gamma rays in the Galaxy