Final Results from the High Resolution Fly's Eye (HiRes) Experiment
P. Sokolsky (for the HiRes Collaboration)
TL;DR
The HiRes experiment's final results confirm the GZK cutoff in the cosmic ray spectrum with high significance, and explore cosmic ray composition and correlations with astronomical objects.
Contribution
This paper provides the definitive observation of the GZK cutoff and analyzes cosmic ray composition and source correlations at ultra-high energies.
Findings
GZK cutoff observed with five sigma significance
Cosmic ray composition near the cutoff discussed
Potential correlations with AGNs and large-scale structures
Abstract
Final results from the High Resolution Fly's Eye (HiRes) on the observation of the Greisen-Zatsepin-Kuzmin cutoff in the cosmic ray spectrum are presented. We observe a cutoff consistent with the GZK predictions with a five sigma significance. The nature of the cosmic ray composition near the GZK cutoff is also discussed as well as possible correlations of the highest energy cosmic rays with AGNs and LSS in the Northern sky.
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