In-medium $\pi-\pi$ correlations in the $\rho$-meson-channel

Abstract : 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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Submitted on : Thursday, March 11, 1999 - 2:30:55 PM
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P. Schuck, F. Bonutti, G. Chanfray, E. Fragiacomo, N. Grion, et al.. In-medium $\pi-\pi$ correlations in the $\rho$-meson-channel. 36th International Winter Meeting on Nuclear Physics, Jan 1998, Bormio, Italy. pp.170-181. ⟨in2p3-00005088⟩

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