Abstract
The new experiment planned at Brookhaven to measure the anomalous magnetic moment of the muona μ≡(g μ−2)/2 will improve the present accuracy of 7 ppm by about a factor of 20. This requires a careful reconsideration of the theoretical uncertainties of theg−2 predictions, which are dominated by the error of the contribution from the light quarks to the photon vacuum polarization. This issue is cruicial also for the precise determination of the running fine structure constant at theZ-peak as LEP/SLC experiments continue to increase their precision. In this paper we present an updated analysis of the hadronic vacuum polarization using all presently availablee +e− data. This seems to be justified because previous work on the subject was based to some extent on preliminary or incomplete experimental data. Contributions from different energy ranges are presented separately forg−2 of the muon and the τ-lepton and for α(M 2Z ). We obtain the resultsa had*μ =(725±16)×10−10 anda had*τ =(351±10)×10−8, where the asterisk indicates the dressed (renormalization group improved) value. For the effective fine structure constant atM Z=91.1888 GeV we obtainΔα (5)had =0.0280±0.0007 and α(M 2Z )−1=128.896±0.090. Further improvement in the accuracy of theoretical predictions which depend on the hadronic vacuum polarization requires more precise measurements ofe +e− cross-sections at energies below about 12 GeV in future experiments.
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Eidelman, S., Jegerlehner, F. Hadronic contributions to (g−2) of the leptons and to the effective fine structure constant α(M 2Z ). Z. Phys. C - Particles and Fields 67, 585–601 (1995). https://doi.org/10.1007/BF01553984
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DOI: https://doi.org/10.1007/BF01553984