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American Physical Society, Physical Review Letters, 19(117), 2016

DOI: 10.1103/physrevlett.117.192001

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Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory

Journal article published in 2016 by Alexander Aab, Andrzej Śmiałkowski, Radomir Šmída, Pedro Abreu, Marco Aglietta, Eun-Joo Ahn, I. Al Samarai, Imen Al Samarai, Ivone F. M. Albuquerque, Ingomar Allekotte, Jeffrey D. Allen, Patrick Allison, Alejandro Almela, J. Alvarez Castillo, Jaime Alvarez-Muñiz and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Published version. Added journal reference and DOI. Added Report Number ; International audience ; Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (E_CM = 110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory. The average hadronic shower is 1.33 +- 0.16 (1.61 +- 0.21) times larger than predicted using the leading LHC-tuned models EPOS-LHC (QGSJetII-04), with a corresponding excess of muons.