Two micron-size dark dimensions are consistent with observations only if the compact space has no isometries and the normalcy temperature is fine-tuned to about 2 MeV.
Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory
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abstract
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.
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Two Micron-Size Dark Dimensions
Two micron-size dark dimensions are consistent with observations only if the compact space has no isometries and the normalcy temperature is fine-tuned to about 2 MeV.