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New Measurement of (g-2) of the Muon

  • J. Bailey
  • K. Borer
  • F. Combley
  • H. Drumm
  • C. Eck
  • F. J. M. Farley
  • J. H. Field
  • W. Flegel
  • P. M. Hattersley
  • F. Krienen
  • F. Lange
  • G. Petrucci
  • E. Picasso
  • H. I. Pizer
  • O. Runolfsson
  • R. W. Williams
  • S. Wojcicki

Abstract

The electron and the muon are the only charged particles which do not participate in the strong interaction, at present not fully understood nor amenable to rigorous calculation. Therefore measurements on the electron or muon in isolation, and on the μ+e system (muonium) can give information on the fine structure constant α, free of doubts about the underlying theory. For the electron the anomalous magnetic moment ae = (g-2)/2 is a known function of α, and in principle provides the purest determination of this quantity. The corresponding quantity aμ for the muon cannot yet be measured so accurately, and the theory is subject to corrections due to the strong and weak interactions which are not accurately known. Nevertheless aμis important in the discussion of the fundamental constants for three reasons:
  1. (a)

    gμ ≡2(1 + aμ) is needed for calculating a from the hyperfine splitting in muonium;

     
  2. (b)

    aμ verifies quantum electrodynamics (QED) at high q2 ~(20 GeV/c)2 making it very unlikely that the theory will be at fault in the low q2 region appropriate for other measurements of fundamental constants;

     
  3. (c)

    corrections to ae and aμ due to modifications of QED, or to couplings to new fields in most cases satisfy1) the rule △ae = (me/mμ) △aμ. So the verification of aμ to 25 ppm validates ae to a much higher accuracy, thus ensuring that ae gives a good measure of α.

     

Keywords

Hyperfine Splitting Uniform Magnetic Field Fundamental Constant Muon Spin Pure Determination 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1).
    B. E. Lautrup, A. Peterman and E. de Rafael, Physics Reports 3C, 239 (1972).CrossRefGoogle Scholar
  2. 2.
    J. Bailey, K. Borer, F. Combley, H. Drumm, C. Eck, F. J. M. Farley, J. H. Field, W. Flegel, P. M. Hattersley, F. Krienen, F. Lange, G. Petrucci, E. Picasso, H. I. Pizer, O. Runolfsson, R. W. Williams and S. Wojcicki, Physics Letters 55B, 420 (1975).Google Scholar
  3. 3.
    K. M. Crowe, J. F. Hague, J. E. Rothberg, A. Schenck, D. L. Williams, R. W. Williams and K. K. Young, Phys. Rev. D5, 2145 (1972).ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1976

Authors and Affiliations

  • J. Bailey
  • K. Borer
  • F. Combley
  • H. Drumm
  • C. Eck
  • F. J. M. Farley
  • J. H. Field
  • W. Flegel
  • P. M. Hattersley
  • F. Krienen
  • F. Lange
  • G. Petrucci
  • E. Picasso
  • H. I. Pizer
  • O. Runolfsson
  • R. W. Williams
  • S. Wojcicki

There are no affiliations available

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