Pion polarizabilities: No conflict between dispersion theory and ChPT

Autor:	Pasquini, B., Drechsel, D., Scherer, S.
Rok vydání:	2009
Předmět:	High Energy Physics - Phenomenology Nuclear Theory
Zdroj:	PoS CD09:037,2009
Druh dokumentu:	Working Paper
Popis:	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 Comment: 9 pages, 4 figures; Proceedings of 6th International Workshop on Chiral Dynamics, 6-10 July 2009, Bern, Switzerland
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0908.4260 Zobrazit plný text záznamu View this record from Arxiv