arxiv: 2102.07797 · v2 · ★pith:V6U2DMIInew · submitted 2021-02-15 · ✦ hep-ex
Measurement of the fluctuations in the number of muons in extensive air showers with the Pierre Auger Observatory
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We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower simulations. This observation provides new insights into the origin of the previously reported deficit of muons in air shower simulations and constrains models of hadronic interactions at ultrahigh energies. Our measurement is compatible with the muon deficit originating from small deviations in the predictions from hadronic interaction models of particle production that accumulate as the showers develop.
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Average universal shower profile reconstruction using radio interferometry
astro-ph.HE 2026-05 unverdicted novelty 5.0
Monte Carlo simulations show radio interferometry reconstructs average Gaisser-Hillas parameters of air shower profiles with enhanced separation of primary masses and hadronic models compared to fluorescence profiles.
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