Upper limit on the flux of photons with energies above 10^19 eV using the Telescope Array surface detector
T. Abu-Zayyad, R. Aida, M. Allen, R. Anderson, R. Azuma, E., Barcikowski, J.W. Belz, D.R. Bergman, S.A. Blake, R. Cady, B.G. Cheon, J., Chiba, M. Chikawa, E.J. Cho, W.R. Cho, H. Fujii, T. Fujii, T. Fukuda, M., Fukushima, D. Gorbunov, W. Hanlon, K. Hayashi, Y. Hayashi
TL;DR
This paper establishes upper limits on the flux of ultra-high energy photons above 10^19 eV using data from the Telescope Array surface detector, employing a statistical analysis of shower front geometries.
Contribution
It introduces a novel event-by-event statistical method to constrain the photon flux at energies above 10^19 eV, based on three years of observational data.
Findings
Set upper limits on photon flux above 10^19 eV
Set upper limits on photon flux above 10^19.5 eV
Set upper limits on photon flux above 10^20 eV
Abstract
We search for ultra-high energy photons by analyzing geometrical properties of shower fronts of events registered by the Telescope Array surface detector. By making use of an event-by-event statistical method, we derive upper limits on the absolute flux of primary photons with energies above 10^19, 10^19.5 and 10^20 eV based on the first three years of data taken.
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