TY - JOUR
T1 - Event rates of UHE photons cascading in the geomagnetic field at CTA-North
AU - the CREDO Collaboration
AU - Cheminant, Kevin Almeida
AU - Góra, Dariusz
AU - Castillo, David E.Alvarez
AU - Budnev, Nikolay
AU - Gupta, Alok C.
AU - Homola, Piotr
AU - Łozowski, Bartosz
AU - Medvedev, Mikhail V.
AU - Mozgova, Alona
AU - Pawlik, Maciej
AU - Rzecki, Krzysztof
AU - Smolek, Karel
AU - Stasielak, Jaroslaw
AU - Sushchov, Oleksandr
AU - Tursunov, Arman
AU - Wibig, Tadeusz
AU - Zamora-Saa, Jilberto
N1 - Publisher Copyright:
© 2021 Copyright owned by the author(s) under the terms of the Creative Commons.
PY - 2022/3/18
Y1 - 2022/3/18
N2 - Photons in the EeV range and beyond are expected from top-down models of UHECR production and from the GZK effect. As they reach the Earth, they have a non-zero probability of converting into an electron/positron pair in the geomagnetic field and of producing an electromagnetic shower above the atmosphere. In this work, we present a new method to search for cascading UHE photons with gamma-ray telescopes based on Monte-Carlo simulations and multivariate analyses. Considering the future CTA-North experiment in La Palma, Spain, we show that such a method provides an efficient cosmic-ray background rejection with little loss of cascading UHE photon events. We also estimate that if gamma-ray bursts photon emission extends to the EeV regime, the number of expected events in 30 hours of observation time can go up to 0.17.
AB - Photons in the EeV range and beyond are expected from top-down models of UHECR production and from the GZK effect. As they reach the Earth, they have a non-zero probability of converting into an electron/positron pair in the geomagnetic field and of producing an electromagnetic shower above the atmosphere. In this work, we present a new method to search for cascading UHE photons with gamma-ray telescopes based on Monte-Carlo simulations and multivariate analyses. Considering the future CTA-North experiment in La Palma, Spain, we show that such a method provides an efficient cosmic-ray background rejection with little loss of cascading UHE photon events. We also estimate that if gamma-ray bursts photon emission extends to the EeV regime, the number of expected events in 30 hours of observation time can go up to 0.17.
UR - http://www.scopus.com/inward/record.url?scp=85144113043&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:85144113043
SN - 1824-8039
VL - 395
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 726
T2 - 37th International Cosmic Ray Conference, ICRC 2021
Y2 - 12 July 2021 through 23 July 2021
ER -