Highest Energy Cosmic Rays and results from the HiRes Experiment
P. Sokolsky (University of Utah), G.B. Thomson (Rutgers University)

TL;DR
This paper reviews the latest findings on ultrahigh energy cosmic rays from the HiRes experiment, including spectrum measurements, the GZK cutoff observation, and comparisons with other major experiments.
Contribution
It provides new high-resolution measurements of cosmic ray spectrum and composition, confirming the GZK cutoff and comparing results across multiple leading observatories.
Findings
Confirmation of the GZK cutoff in the cosmic ray spectrum
Measurements of cosmic ray composition and shower profiles
Comparison of HiRes results with AGASA, Telescope Array, and Pierre Auger
Abstract
The status of the field of ultrahigh energy cosmic rays is summarized, from the point of view of the latest results of the High Resolution Fly's Eye (HiRes) Experiment. HiRes results are presented, and compared with those of the Akeno Giant Air Shower Array (AGASA), plus the Telescope Array and Pierre Auger experiments. The HiRes measurements of the cosmic ray spectrum, and the observation of the GZK cutoff are presented. HiRes results on composition, searches for anisotropy, measurement of the proton-air total cross section, and shapes of shower profiles are presented.
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