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RESEARCH PRODUCT

Meson Properties in Nuclear Medium

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In this paper, we report on the properties of meson resonances in the nuclear medium, in the scalar and vector sectors. First of all, the ρ meson is studied by looking at the pion-pion scattering amplitude in the vector-isovector channel, following a chiral unitary framework in free space and in the medium. The pious are modified in the medium by means of p-h and Δ-h excitations, and the p meson couples to these components as well as to N*(1520)-h excitations. Second, the Φ meson spectrum due to the kaon channel is obtained in terms of the Φ selfenergy provided by a chiral SU(3) dynamics model. The medium effects are considered in the properties of K and K mesons which are renormalized by S- and P-wave interactions with the nucleons, provided by the lowest order moson-baryon chiral effective lagrangian. Both the in-medium mass and width of the Φ are obtained. Finally, the scalar resonances σ, f 0 and a 0 are studied in the medium from a coupled channel chiral unitary model for meson-meson scattering. To this respect we look at recent experimental results on the two pion photoproduction reaction in nuclei.