Speaker
Dr
Martin Hoferichter
(University of Bern)
Description
We present a formalism for the scattering of two photons into a pion pair
based on dispersion relations in combination with unitarity, chiral symmetry, and soft-photon constraints.
In particular, we discuss the complications that arise due to the analyticity properties of the amplitude
if both photons are off-shell, and argue that the dispersive framework can be extended to remain valid
even in that case. Such a representation is crucial input for a reduction of model dependence in the light-by-light scattering contribution to the anomalous magnetic moment of the muon.
Primary authors
Prof.
Gilberto Colangelo
(University of Bern)
Dr
Martin Hoferichter
(University of Bern)
Dr
Massimiliano Procura
(University of Bern)
Mr
Peter Stoffer
(University of Bern)
