Dropping Sigma-Meson Mass and In-Medium S-Wave pion-pion Correlations
Z. Aouissat, G. Chanfray, P. Schuck, J. Wambach
Abstract
The influence of a dropping sigma-meson mass on previously calculated in-medium pion-pion correlations in the J=I=0 (sigma-meson) channel is investigated. It is found that the invariant-mass distribution around the vacuum threshold experiences a further strong enhancement with respect to standard many-body effects. The relevance of this result for the explanation of recent A(π,2π)X data is pointed out.
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