1998/06/23 by P. Schuck, Z. Aouissat, Schuck, P. +11
Physics and Astronomy · #FOS: Physical sciences #Nuclear Theory (nucl-th) #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/9806069
11 pages, Latex, 5 figures
arxiv created 1998/06/23 · arxiv updated 2009/12/01
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.