25.11.2014 16:15

Dispersive Approach to Hadronic Light-by-Light Scattering and the Muon g-2

Peter Stoffer (Bonn)

The anomalous magnetic moment of the muon has been measured and computed to very high precision of about 0.5 ppm. For more than a decade, a discrepancy has persisted between the experiment and the Standard Model prediction, now of about 3 sigma. Forthcoming experiments at FNAL and J-PARC aim at reducing the experimental error by a factor of 4.


The main uncertainty of the theory prediction is due to strong interaction effects. At present, the largest uncertainty comes from hadronic vacuum polarisation, which, however, is expected to be reduced significantly with help of new data from e+e- experiments. In a few years, the subleading hadronic light-by-light (HLbL) contribution will become the dominating error.

So far, only model calculations of the HLbL contribution exist. In this talk, I will present a model-independent, dispersive approach to HLbL scattering and highlight the advantages of a data-driven determination of the HLbL contribution.

Kategorie: Kernphysik