Pion polarizabilities: No conflict between dispersion theory and ChPT

Details Pion polarizabilities: No conflict between dispersion theory and ChPT Pion polarizabilities: No conflict between dispersion theory and ChPT

2009-08-28

arxiv.org/abs/0908.4260v1

PoS CD09:037, 2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 4 figures; Proceedings of 6th International Workshop on Chiral Dynamics, 6-10 July 2009, Bern, Switzerland

Scientific paper

Recent attempts to determine the pion polarizability by dispersion relations yield values that disagree with the predictions of chiral perturbation theory. These dispersion relations are based on specific forms for the absorptive part of the Compton amplitudes. The analytic properties of these forms are examined, and the strong enhancement of intermediate-meson contributions is shown to be connected to non-analytic structures

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