Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory
Creators: name: The Pierre Auger Collaboration
name: Aab, A.
name: Abreu, P.
name: Aglietta, M.
name: Ahn, E. J.
name: Samarai, I. Al
name: Albuquerque, I. F. M.
name: Allekotte, I.
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name: Castillo, J. Alvarez
name: Alvarez-Muñiz, J.
name: Ambrosio, M.
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name: Anchordoqui, L.
name: Andrada, B.
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name: de Almeida, R. M.
name: de Jong, S. J.
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name: Neto, J. R. T. de Mello
name: De Mitri, I.
name: de Oliveira, J.
name: de Souza, V.
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name: del Peral, L.
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Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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.
description: Published version. Added journal reference and DOI. Added Report Number