= Muon storage-ring time-dilation experiment
Accelerator-produced <muons> circulating in a magnetic storage ring allow a direct comparison between their measured laboratory <mean lifetime> and $\gamma$ times the rest lifetime. The 1977 experiment at $\gamma=29.33$ measured positive- and negative-muon lifetimes near $64.4\,\mathrm{\mu s}$, consistent with <time dilation>. This is a controlled complement to atmospheric survival measurements, with different systematic effects.<Measurements of relativistic time dilatation for positive and negative muons in a circular orbit by J. Bailey and others>[1977 abstract, Lorentz factor, lifetimes and comparison with the lifetime at rest]{ref}
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