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

Nature volume 268, pages 301305 (28 July 1977) | Download Citation

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Abstract

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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Author information

Affiliations

  1. Daresbury Laboratory, Warrington, Lancashire, UK

    • J. Bailey
  2. Physikalisches Institut, Universität Beon, Bern, Switzerland

    • K. Borer
  3. Department of Physics, University of Sheffield, Sheffield, UK

    • F. Combley
  4. European Organization for Nuclear Research, Geneva

    • H. Drumm
  5. European Organization for Nuclear Research, Geneva

    • F. Krienen
  6. Institut für Physik der Universität Mainz, Mainz, FRG

    • F. Lange
  7. European Organization for Nuclear Research, Geneva

    • E. Picasso
  8. Institut für Physik der Universität Mainz, Mainz, FRG

    • W. von Ruden
  9. Royal Military College of Science, Shrivenham, Wiltshire, UK

    • F. J. M. Farley
  10. European Organization for Nuclear Research, Geneva

    • J. H. Field
  11. European Organization for Nuclear Research, Geneva

    • W. Flegel
  12. Department of Physics, University of Birmingham, Birmingham, UK

    • P. M. Hattersley

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https://doi.org/10.1038/268301a0

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