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On the need for unbiasing azimuthal asymmetry in signals measured by surface detector arrays

Luce, Quentin 1; Roth, Markus 1; Schmidt, David 2; Veberič, Darko 1
1 Institut für Astroteilchenphysik (IAP), Karlsruher Institut für Technologie (KIT)
2 Institut für Experimentelle Teilchenphysik (ETP), Karlsruher Institut für Technologie (KIT)


A surface detector array samples the lateral distribution of an extensive air-shower (EAS) at the ground, i.e. the density of particles as a function of the distance from the axis of the shower. The azimuthal symmetry of this measured lateral distribution is broken for EAS with a non-zero zenith angle. The resulting asymmetry, caused by atmospheric attenuation and geometrical effects, increases with the inclination of the shower and introduces a bias in the reconstruction of the shower parameters. Using simulated sets of air-showers, we present a model to correct the azimuthal asymmetry in signals measured by water-Cherenkov detectors and exemplified using the geometry and detector response of the Pierre Auger Observatory. Testing showers initiated by proton and iron primaries using EPOS-LHC and QGSJetII-04 as hadronic models, we developed a fine-tuned model of the amplitude of the asymmetry as a function of the zenith angle, shower size and distance of a detector from the shower axis. The improvements resulting from the application of the correction are quantified in terms of the biases and resolutions in the impact-point and arrival direction.

Verlagsausgabe §
DOI: 10.5445/IR/1000138545
Veröffentlicht am 11.10.2021
DOI: 10.22323/1.395.0435
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 18.03.2022
Sprache Englisch
Identifikator ISSN: 1824-8039
KITopen-ID: 1000138545
HGF-Programm 51.13.03 (POF IV, LK 01) Kosmische Strahlung Auger
Erschienen in Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)
Veranstaltung 37th International Cosmic Ray Conference (ICRC 2021), Online, 12.07.2021 – 23.07.2021
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Seiten Art.-Nr.: 435
Serie Proceedings of Science / International School for Advanced Studies ; 395
Vorab online veröffentlicht am 05.07.2021
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