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Study on the combined estimate of the cosmic-ray composition and particle cross-sections at ultrahigh energies

Tkachenko, Olena; Engel, Ralph; Ulrich, Ralf; Unger, Michael

Abstract (englisch):
The mass composition is one of the key observables to understand the nature and origin of ultrahigh-energy cosmic rays (UHECRs). The study of hadronic interactions at energies well beyond human-made accelerators is a fundamental probe of elementary particle physics. In previous analyses, the properties of the hadronic interactions were estimated under the assumption of a certain mass composition, typically proton-dominated, and the cross-sections were calculated by fitting the tail of the Xmax distribution. In such an analysis, the impact of a possible He-contamination on the cross-section measurement is quoted as a systematic uncertainty. Vice versa, the cosmic-ray mass composition is typically determined using air shower simulations by assuming the validity of the considered hadronic interaction models.

In this contribution, we present a fully self-consistent approach of varying the proton-proton cross-sections, with the nucleus-nucleus cross-sections being predicted via the Glauber theory, and making a full Xmax distribution fit to get an independent and simultaneous estimation of the interaction cross-sections and cosmic-ray primary composition. ... mehr

Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Publikationstyp Vortrag
Publikationsmonat/-jahr 07.2021
Sprache Englisch
Identifikator KITopen-ID: 1000132757
HGF-Programm 51.13.03 (POF IV, LK 01) Kosmische Strahlung Auger
Veranstaltung 37th International Cosmic Ray Conference (ICRC 2021), Online, 12.07.2021 – 23.07.2021
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