Unitarity constraints on chiral perturbative amplitudes

Details Unitarity constraints on chiral perturbative amplitudes Unitarity constraints on chiral perturbative amplitudes

2009-05-05

arxiv.org/abs/0905.0528v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at: International Workshop on Effective Field Theories: from the pion to the upsilon, February 2-6 2009, Valencia,

Scientific paper

Low lying scalar resonances emerge as a necessary part to adjust chiral perturbation theory to experimental data once unitarity constraint is taken into consideration. I review recent progress made in this direction in a model independent approach. Also I briefly review studies on the odd physical properties of these low lying scalar resonances, including in the $\gamma\gamma\to\pi^+\pi^-, \pi^0\pi^0$ processes.

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