VIRTUAL PHOTON–PHOTON SCATTERING
- HOFERICHTER, MARTIN Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH–3012 Bern, Switzerland
- COLANGELO, GILBERTO Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH–3012 Bern, Switzerland
- PROCURA, MASSIMILIANO Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH–3012 Bern, Switzerland
- STOFFER, PETER Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH–3012 Bern, Switzerland
- 2014-12-17
Published in:
- International Journal of Modern Physics: Conference Series. - World Scientific Pub Co Pte Lt. - 2014, vol. 35, p. 1460400
English
Based on analyticity, unitarity, and Lorentz invariance the contribution from hadronic vacuum polarization to the anomalous magnetic moment of the muon is directly related to the cross section of e+ e− → hadrons . We review the main difficulties that impede such an approach for light-by-light scattering and identify the required ingredients from experiment. Amongst those, the most critical one is the scattering of two virtual photons into meson pairs. We analyze the analytic structure of the process γ*γ* → ππ and show that the usual Muskhelishvili–Omnès representation can be amended in such a way as to remain valid even in the presence of anomalous thresholds.
- Language
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- English
- Open access status
- hybrid
- Identifiers
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- DOI 10.1142/s2010194514604001
- ISSN 2010-1945
- Persistent URL
- https://sonar.ch/global/documents/169
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