PHIPSI13 - International Workshop on e+e- collisions from Phi to Psi 2013

Session

Measurement and Theoretical Evaluation of g-2 (I)

9 Sept 2013, 16:15

Aula Amaldi (Dip. di Fisica - "Sapienza" Universita' di Roma - G. Marconi building)

9. Unified dispersive approach to gamma* -> gamma pi pi and gamma gamma -> pi pi at low energy

Dr Bachir Moussallam (IPN, Universite Paris-Sud)

09/09/2013, 16:15

We discuss how to generalize the classic results on photon-photon scattering which combine dispersion theoretical constraints with chiral symmetry and soft photon theorems to the photon-photon*(q^2) scattering amplitude into a pion pair. This generalisation requires a specific treatment of resonance exchange diagrams. The constructed amplitude displays explicitly the dependence on pi-pi...

8. Virtual photon-photon scattering

Dr Martin Hoferichter (University of Bern)

09/09/2013, 16:35

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...

24. The light-by-light contribution to the muon (g-2) within nonlocal chiral quark model

Dr Andrey Radzhabov (The Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences)

09/09/2013, 16:55

The light-by-light contribution to the anomalous magnetic moment of muon is calculated in the framework of the nonlocal chiral quark model. The contributions from pseudoscalar and scalar resonances and nonresonance contact terms are included. Full kinematic dependence of vertices with off-shell photons and mesons in intermediate states in the light-by-light scattering amplitude is taken into...