Renormalization of the f0(980) and a0(980) scalar resonances in a nuclear medium Original Research Article

The meson–meson interaction in the scalar sector in the presence of a nuclear medium is studied with particular attention to the change of the properties of the View the MathML source and View the MathML source resonances. By using a chiral unitary approach which generates the View the MathML source and View the MathML source resonances and reproduces their free properties, we find that the position of the resonances in the medium is barely changed but their widths are considerably broadened. New many body corrections generating from higher orders in the chiral Lagrangian plus the contribution from N∗h excitations, not considered before in connection with the ππ interaction in the nuclear medium, are also investigated.