Regular Article - Theoretical Physics
Towards an improved understanding of
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, 53115, Bonn, Germany
2 Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
3 Instituto de Física Corpuscular, Universitat de València–Consejo Superior de Investigaciones Científicas, Parc Científic, 46980, Paterna, Valencia, Spain
4 Institut für Kernphysik (Theorie), Institute for Advanced Simulation, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany
5 School of Physics and Electronics, Central South University, 410083, Changsha, China
6 Tbilisi State University, 0186, Tbilisi, Georgia
Accepted: 16 September 2021
Published online: 13 November 2021
We argue that high-quality data on the reaction will allow one to determine the doubly-virtual form factor in a model-independent way with controlled accuracy. This is an important step towards a reliable evaluation of the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. When analyzing the existing data for for total energies squared , we demonstrate that the effect of the meson provides a natural breaking mechanism for the commonly employed factorization ansatz in the doubly-virtual form factor . However, better data are needed to draw firm conclusions.
© The Author(s) 2021
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