In-Medium $π-π$ Correlations in the '$σ$-Meson'-Channel

Details In-Medium $π-π$ Correlations in the '$σ$-Meson'-Channel In-Medium $π-π$ Correlations in the '$σ$-Meson'-Channel

1998-06-23

arxiv.org/abs/nucl-th/9806069v1

Physics

Nuclear Physics

Nuclear Theory

11 pages, Latex, 5 figures

Scientific paper

The present status of the in-medium invariant $\pi-\pi$ mass distribution in the sigma-meson channel around the threshold is reviewed from the theory side and contrasted with recent experiments on $(\pi,2\pi)$ knock-out reactions. A preliminary investigation indicates that the strongly target-mass dependent invariant mass enhancement of the two pions can be explained theoretically. A more refined reaction theory is needed to confirm this result. In the theoretical description, based on the linear sigma model, emphasis is put on constraints from chiral symmetry.

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