Chiral nonperturvative approach to the isoscalar s-wave pion-pion interaction in a nuclear medium

Details Chiral nonperturvative approach to the isoscalar s-wave pion-pion interaction in a nuclear medium Chiral nonperturvative approach to the isoscalar s-wave pion-pion interaction in a nuclear medium

1997-12-12

arxiv.org/abs/nucl-th/9712047v2

Nucl.Phys.A644:77-92,1998

Physics

Nuclear Physics

Nuclear Theory

18 pages, LaTeX, 8 PostScript figures.(Revised version Aug-98, with corrected results and new references)

Scientific paper

10.1016/S0375-9474(98)00578-8

The s-wave isoscalar amplitude for pion-pion scattering in a nuclear medium is evaluated using a nonperturbative unitary coupled channels method and the standard chiral Lagrangians. The method has proved successful to describe the pion-pion properties in the scalar isoscalar channel up to 1.2 GeV giving rise to poles in the t matrix for the f0(980) and the sigma. The extension of the method to the nuclear medium implies not only the renormalization of the pions in the medium, but also the introduction of interaction terms related to contact terms in the pion-nucleon to pion-pion-nucleon interaction. Off shell effects are also shown to be important leading to cancellations which reduce the coupled channel integral equations to a set of algebraic equations. As the density increases we find a reduction of strength below the $\sigma$ region and a certain accumulation of strength at energies around pion threshold. Our results, based on chiral Lagrangians, provide similar results to those obtained with phenomenological models which impose minimal chiral constraints.

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