Hadronic light-by-light contribution to (g - 2)μ: a dispersive approach
Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
2 Institute for Nuclear Theory, University of Washington, Seattle, WA 98195-1550, USA
3 Fakultät für Physik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria
4 Department of Physics, University of California at San Diego, La Jolla, CA 92093, USA
* Speaker, e-mail: firstname.lastname@example.org
Published online: 26 March 2018
After a brief introduction on ongoing experimental and theoretical activities on (g - 2)μ, we report on recent progress in approaching the calculation of the hadronic light-by-light contribution with dispersive methods. General properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation are discussed. On this basis a numerical estimate for the pion box contribution and its rescattering corrections is obtained. We conclude with an outlook for this approach to the calculation of hadronic light-by-light.
© The Authors, published by EDP Sciences, 2018
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