Dresden 2000 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 14: Postersitzung / Theorie

HK 14.44: Poster

Donnerstag, 23. März 2000, 10:15–12:45, B 113

Fluctuations of the in-medium chiral condensate and the pion-pion correlations — •Carsten Isselhorst, Zoheir Aouissat, and Jochen Wambach — Institut für Kernphysik, Technische Universität Darmstadt

In medium s-wave pion-pion correlations have recently attracted much attention both on the theoretical and experimental sides. These studies are of relevance for the behavior of the in-medium chiral condensate and its fluctuations with increasing density. Earlier studies have shown that standard p-wave coupling of the pion to Δ-h and p-h configurations induces a strong enhancement of the ππ invariant-mass distribution around the 2m_π threshold [1], thus signaling increased fluctuations in the σ-channel.It has been argued that this effect could possibly explain the A(π,2π) knockout reaction data from the CHAOS collaboration [2]. On the other hand Hatsuda et al.[3] argued that the partial restoration of chiral symmetry in nuclear matter, which leads to a dropping of the σ-meson mass, induces similar effects as the standard many-body correlation mentioned above. It is therefore natural to study the combination of both effects. This will be presented in the present talk.

[1] Z. Aouissat, R. Rapp, G. Chanfray, P. Schuck, J. Wambach, Nucl.Phys. A.581 (1995) 471.

[2] F. Bonutti et al., Phys. Rev. Lett. 77 (1996) 603.

[3] T. Hatsuda, T. Kunihiro, H. Shimizu, Phys. Rev. Lett. 82 (1999) 2840.