In-medium pi-pi Correlation Induced by Partial Restoration of Chiral Symmetry

Details In-medium pi-pi Correlation Induced by Partial Restoration of Chiral Symmetry In-medium pi-pi Correlation Induced by Partial Restoration of Chiral Symmetry

2000-08-09

arxiv.org/abs/hep-ph/0008076v1

Phys.Rev.D63:011901,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 5 eps figure, REVTeX

Scientific paper

10.1103/PhysRevD.63.011901

We show that both the linear and the non-linear chiral models give an enhancement of the pi-pi cross section near the 2pi threshold in the scalar-iso-scalar (I=J=0) channel in nuclear matter. The reduction of the chiral condensate, i.e., the partial chiral restoration in nuclear matter, is responsible for the enhancement in both cases. We extract an effective 4pi-nucleon vertex which is responsible for the enhancement but has not been considered in the non-liear models for in-medium pi-pi interaction. Relation of this vertex and a next-to-leading order terms in the heavy-baryon chiral lagrangian, L_piN^(2), is also discussed.

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