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Theoretical precision in estimates of the hadronic contributions to (g − 2)μ and αQED(Mz)

✍ Scribed by F. Jegerlehner

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
930 KB
Volume
126
Category
Article
ISSN
0920-5632

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✦ Synopsis

I review recent estimates of the non-perturbative hadronic vacuum polarization contributions. Since these at present can only be evaluated in terms of experimental data of limited precision, the related uncertainties pose a serious limitation in our ability to make precise predictions.

Besides e+e--annihilation data also 7 decay spectra can help to get better predictions.

Here, it is important to account for all possible iso-spin violations in T-decay spectra, from which e+e-cross sections may be obtained by an iso-spin rotation.

The observed 10% discrepancy in the region above the p may be understood as a so far unaccounted iso-spin breaking effect.

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We make use of recent accurate results obtained for the pion and kaon vector form factors within a chiral unitary approach in order to calculate the decay widths of the r lepton to these mesons and also to evaluate the contribution of this two mesons to the anomalous magnetic moment of the muon, the