The Muon Anomalous g-Value

  • Vernon W. Hughes
Part of the Ettore Majorana International Science Series book series (EMISS, volume 31)


The muon g-2 value has played a central role in establishing that the muon obeys quantum electrodynamics (QED) and behaves like a heavy electron.1,2 The experimental value for g-2 has been determined by three progressively more precise measurements at CERN,3,4,5 the latest one achieving a precision of 7.2 ppm. The theoretical value for g-2 has steadily become better known as higher order QED radiative contributions have been evaluated, and as knowledge of the virtual hadronic contributions to g-2 has been improved both by further measurements of the relevant quantity R = σ(e+e- → hadrons)/ σ(e+e- → μ+μ-) and by calculations. The theoretical value of g-2 is now known to 1.3 ppm, a factor of 6 better than the experimental value.7 The present agreement of theory and experiment establishes that QED applies for the muon up to Q2 = 1000 (GeV/c)2 and determines the hadronic contribution to the vacuum polarization to about 12%. Futhermore, one of the most sensitive limits on muon substructure (Λ > 800 GeV) is provided, as well as limits to various speculative modern theories.


Vacuum Polarization Lamb Shift Muon Spin Precession Frequency Radiative Contribution 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Vernon W. Hughes
    • 1
  1. 1.Gibbs Laboratory, Physics DepartmentYale UniversityNew HavenUSA

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