We first briefly review a treatment of the scalars in meson meson scattering based on a non-linear chiral Lagrangian, with unitarity implemented by a "local" modification of the scalar propagators. It is shown that the main results are confirmed by a treatment in the SU(3) linear sigma model in which unitarity is implemented "globally". Some remarks are made on the speculative subject of the scalars' quark structure.
Schechter, Joseph; Black, D.; Fariborz, Amir H.; Moussa, Salah; and Nasri, S., "Investigating the Light Scalar Mesons" (2001). Physics. 285.
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