In-Medium π-π Correlations in the 'σ-Meson'-Channel
P. Schuck, Z. Aouissat, F. Bonutti, G. Chanfray, E. Fragiacomo, N. Grion, J. Wambach
Abstract
The present status of the in-medium invariant π-π mass distribution in the sigma-meson channel around the threshold is reviewed from the theory side and contrasted with recent experiments on (π,2π) 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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