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Hadronic light-by-light scattering contribution to gμ − 2

✍ Scribed by Andreas Nyffeler

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
390 KB
Volume
116
Category
Article
ISSN
0920-5632

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✦ Synopsis

We briefly review the current status of the hadronic light-by-light scattering correction to the muon g -2.

Then we present our semi-analytical evaluation of the pion-pole contribution, using a description of the pionphoton-photon transition form factor based on large-Nc and short-distance properties of QCD. We derive a two-dimensional integral representation which allows to separate the generic features from the model dependence, in order to better control the latter. Finally, we sketch an effective field theory approach to hadronic light-by-light scattering which yields the leading logarithmic terms that are enhanced by a factor Nc. It also shows that the modeling of hadronic light-by-light scattering by a constituent quark loop is not consistent with QCD.

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