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The Muon Anomalous g-Value

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Fundamental Symmetries

Part of the book series: Ettore Majorana International Science Series ((EMISS,volume 31))

Abstract

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.

Research supported in part by DOE under contract DE-AC02-ER03075 and DE-FG02-84ER402234.

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Authors and Affiliations

  1. Gibbs Laboratory, Physics Department, Yale University, New Haven, Ct., 06520, USA

    Vernon W. Hughes

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  1. Vernon W. Hughes
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Editors and Affiliations

  1. CERN, Geneva, Switzerland

    P. Bloch , P. Pavlopoulos  & R. Klapisch ,  & 

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© 1987 Plenum Press, New York

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Hughes, V.W. (1987). The Muon Anomalous g-Value. In: Bloch, P., Pavlopoulos, P., Klapisch, R. (eds) Fundamental Symmetries. Ettore Majorana International Science Series, vol 31. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5389-8_24

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  • DOI: https://doi.org/10.1007/978-1-4684-5389-8_24

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