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Article
Nature 268, 301 - 305 (28 July 1977); doi:10.1038/268301a0

Measurements of relativistic time dilatation for positive and negative muons in a circular orbit

J. Bailey1, K. Borer2, F. Combley3, H. Drumm4, F. Krienen5, F. Lange6, E. Picasso7, W. von Ruden8, F. J. M. Farley9, J. H. Field10, W. Flegel11 & P. M. Hattersley12

1Daresbury Laboratory, Warrington, Lancashire, UK
2Physikalisches Institut, Universität Beon, Bern, Switzerland
3Department of Physics, University of Sheffield, Sheffield, UK
4European Organization for Nuclear Research, Geneva
5European Organization for Nuclear Research, Geneva
6Institut für Physik der Universität Mainz, Mainz, FRG
7European Organization for Nuclear Research, Geneva
8Institut für Physik der Universität Mainz, Mainz, FRG
9Royal Military College of Science, Shrivenham, Wiltshire, UK
10European Organization for Nuclear Research, Geneva
11European Organization for Nuclear Research, Geneva
12Department of Physics, University of Birmingham, Birmingham, UK

The lifetimes of both positive and negative relativistic (γ = 29.33) muons have been measured in the CERN Muon Storage Ring with the results τ+ = 64.419 (58) µs, τ = 64.368 (29) µs The value for positive muons is in accordance with special relativity and the measured lifetime at rest: the Einstein time dilation factor agrees with experiment with a fractional error of 2×10−3 at 95% confidence. Assuming special relativity, the mean proper lifetime for μ is found to be τ0 = 2.1948(10) µs the most accurate value reported to date. The agreement of this value with previously measured values of τ0 + confirms CPT invariance for the weak interaction in muon decay.

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