Abstract
Based on dispersion theory, we present a formalism for a model-independent evaluation of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon. In particular, we comment on the definition of the pion pole in this framework and provide a master formula that relates the effect from ππ intermediate states to the partial waves for the process γ * γ * → ππ. All contributions are expressed in terms of on-shell form factors and scattering amplitudes, and as such amenable to an experimental determination.
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Colangelo, G., Hoferichter, M., Procura, M. et al. Dispersive approach to hadronic light-by-light scattering. J. High Energ. Phys. 2014, 91 (2014). https://doi.org/10.1007/JHEP09(2014)091
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DOI: https://doi.org/10.1007/JHEP09(2014)091