The polarizability of the pion: no conflict between dispersion theory and chiral perturbation theory

Autor:	Pasquini, B., Drechsel, D., Scherer, S.
Rok vydání:	2008
Předmět:	High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory
Zdroj:	Phys.Rev.C77:065211,2008
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevC.77.065211
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 with spurious singularities. If the basic requirements of dispersion relations are taken into account, the results of dispersion theory and effective field theory are not inconsistent. Comment: 30 pages, 8 figures, 6 tables
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0805.0213 Zobrazit plný text záznamu View this record from Arxiv