2016/06/30 by Jan Ebr, Petr Nečesal, Petr Necesal +2
Physics and Astronomy · #Air shower #Astrophysics #Astrophysics and Cosmic Phenomena #Atomic physics #Auger #Cosmic ray #Dark Matter and Cosmic Phenomena #Hadron #Muon #Nuclear physics #Observatory #Particle physics #Particle physics theoretical and experimental studies #Physics #Pierre Auger Observatory #Ultra-high-energy cosmic ray #astro-ph.HE
paper · pdf · doi:10.1016/j.astropartphys.2017.02.001
Submitted to Astroparticle Physics
arxiv created 2017/02/01 · openalex publication_date 2017/02/13 · arxiv updated 2017/03/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Indications of a discrepancy between simulations and data on the number of muons in cosmic ray (CR) showers exist over a large span of energies. We focus in particular on the excess of multi-muon bundles observed by the DELPHI detector at LEP and on the excess in the muon number in general reported by the Pierre Auger Observatory. Even though the primary CR energies relevant for these experiments differ by orders of magnitude, we can find a single mechanism which can simultaneously increase predicted muon counts for both, while not violating constraints from accelerators or from the longitudinal shower development as observed by the Pierre Auger Observatory. We present a brief theoretical motivation and describe a practical implementation of such a model, based on the addition of soft particles to interactions above a chosen energy threshold. Results of an extensive set of simulations show the behavior of this model in various parts of a simplified parameter space.