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Hadronic light-by-light scattering in the muon g-2: a dispersive approach

Dr. Martin Hoferichter (Institut f. Kernphysik, TU Darmstadt)

Datum:  04.12.2014 um 16:00 Uhr – 04.12.204 um 17:00 Uhr

Ort: Seminar room 127 (Physics Department TUM, Physik II, ground floor/north)

The uncertainty in the Standard-Model prediction for the anomalous magnetic moment of the muon is dominated by strong interaction contributions. While the accuracy of hadronic vacuum polarization can be improved by dedicated e^+e^- --> hadrons cross-section measurements, the evaluation of hadronic light-by-light scattering currently relies on models and is likely to constitute the road block for fully exploiting the upcoming g-2 experiments at FNAL and J-PARC. In the talk I will review our recently developed dispersive formalism that allows for a data-driven analysis of the most important hadronic channels in the light-by-light tensor, and discuss the experimental ingredients required for the evaluation of one- and two-pion intermediate states.

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