A. Bramon, R. Escribano, J. L. L. Martinez
Published 2003-12-23, updated 2004-04-14Version 3
A comparison of the linear sigma model (L$\sigma$M) and Chiral Perturbation Theory (ChPT) predictions for pion and kaon dynamics is presented. Lowest and next-to-leading order terms in the ChPT amplitudes are reproduced if one restricts to scalar resonance exchange. Some low energy constants of the order $p^4$ ChPT Lagrangian are fixed in terms of scalar meson masses. Present values of these low energy constants are compatible with the L$\sigma$M dynamics. We conclude that more accurate values would be most useful either to falsify the L$\sigma$M or to show its capability to shed some light on the controversial scalar physics.
Comments: 9 pages, REVTeX 4.0. Final version accepted for publication
Journal: Phys.Rev. D69 (2004) 074008
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