Virtual photon-photon scattering

Hoferichter, Martin; Colangelo, Gilberto; Procura, Massimiliano; Stoffer, Peter (18 December 2014). Virtual photon-photon scattering. International Journal of Modern Physics: Conference Series, 35, p. 1460400. 10.1142/S2010194514604001

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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.

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Hoferichter, Martin; Colangelo, Gilberto; Procura, Massimiliano and Stoffer, Peter

Subjects:

500 Science > 530 Physics

ISSN:

2010-1945

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

26 Jan 2015 16:18

Last Modified:

26 Jan 2015 16:18

Publisher DOI:

10.1142/S2010194514604001

BORIS DOI:

10.7892/boris.62060

URI:

https://boris.unibe.ch/id/eprint/62060

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