Searches for Ultra-High-Energy Photons at the Pierre Auger Observatory
The Pierre Auger Collaboration: P. Abreu, M. Aglietta, I. Allekotte,, K. Almeida Cheminant, A. Almela, J. Alvarez-Mu\~niz, J. Ammerman Yebra, G.A., Anastasi, L. Anchordoqui, B. Andrada, S. Andringa, C. Aramo, P.R. Ara\'ujo, Ferreira, E. Arnone, J. C. Arteaga Vel\'azquez

TL;DR
This paper reviews 18 years of searches for ultra-high-energy photons at the Pierre Auger Observatory, summarizing results on diffuse flux, point sources, and transient events to understand their origins and properties.
Contribution
It provides a comprehensive summary of all UHE photon searches conducted at the Pierre Auger Observatory over 18 years, highlighting current constraints and findings.
Findings
No significant detection of UHE photons so far
Stringent upper limits on diffuse UHE photon flux
Constraints on sources of transient UHE photon signals
Abstract
The Pierre Auger Observatory, being the largest air-shower experiment in the world, offers an unprecedented exposure to neutral particles at the highest energies. Since the start of data taking more than 18 years ago, various searches for ultra-high-energy (UHE, ) photons have been performed: either for a diffuse flux of UHE photons, for point sources of UHE photons or for UHE photons associated with transient events like gravitational wave events. In the present paper, we summarize these searches and review the current results obtained using the wealth of data collected by the Pierre Auger Observatory.
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