Chiral non-perturbative approach to the isoscalar s-wave pi pi interaction in a nuclear medium
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Chiral non-perturbative approach to the isoscalar s-wave pi pi interaction in a nuclear medium

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Chiral non-perturbative approach to the isoscalar s-wave pi pi interaction in a nuclear medium

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dc.contributor.author Chiang, H.C.
dc.contributor.author Oset Báguena, Eulogio
dc.contributor.author Vicente Vacas, Manuel José
dc.date.accessioned 2014-10-24T07:55:58Z
dc.date.available 2014-10-24T07:55:58Z
dc.date.issued 1998
dc.identifier.uri http://hdl.handle.net/10550/39335
dc.description.abstract The s-wave isoscalar amplitude for pi pi 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 pi pi properties in the scalar-isoscalar channel up to 1.2 GeV, giving rise to poles in the t matrix for the f(0)(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 pi N --> pi pi N 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 a 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.
dc.language.iso eng
dc.relation.ispartof Nuclear Physics A, 1998, vol. 644, num. 1-2, p. 77-92
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Chiang, H.C. Oset Báguena, Eulogio Vicente Vacas, Manuel José 1998 Chiral non-perturbative approach to the isoscalar s-wave pi pi interaction in a nuclear medium Nuclear Physics A 644 1-2 77 92
dc.subject Física
dc.title Chiral non-perturbative approach to the isoscalar s-wave pi pi interaction in a nuclear medium
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-10-24T07:55:58Z
dc.identifier.doi http://dx.doi.org/10.1016/S0375-9474(98)00578-8
dc.identifier.idgrec 079427

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