https://doi.org/10.1140/epja/i2002-10264-8
Experimental signals of 
-mesons in nuclei and chiral symmetry
Departamento de Física Teórica and IFIC, Universidad de Valencia-CSIC, Ap. Correos 22085, E-46071, Valencia, Spain
* e-mail: Manuel.J.Vicente@uv.es
The 
interaction in the scalar isoscalar channel is studied as a function of the baryonic density in the framework of a chiral unitary approach which successfully reproduces vacuum 
- phase shifts. We present some results on the -meson pole, which is generated dynamically in our model, in nuclear matter. Finally, we analyze the (
) reaction on nucleons and nuclei in the kinematical region where the scalar isoscalar scattering amplitude is influenced by the low mass of the in nuclei, and thus, presents a large enhancement close to the position of its pole. Indeed, we find, that the final-state interaction of the pions modified by the nuclear medium produces a large shift of strength of the two-pion invariant-mass distribution in the (
) channel consistent with recent experimental data.
© Società Italiana di Fisica and Springer-Verlag, 2003
