Self consistent and covariant propagation of pions, nucleon and isobar resonances in cold nuclear matter

C. Korpa, M. F M Lutz

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We evaluate the in-medium spectral functions for pions, nucleon and isobar resonances in a self consistent and covariant manner. The calculations are based on a recently developed formulation which leads to predictions in terms of the pion-nucleon scattering phase shifts and a set of Migdal parameters describing important short range correlation effects. We do not observe significant softening of pion modes if we insist on reasonable isobar resonance properties but predict a considerable broadening of the N(1440) and N(1520) resonances in nuclear matter. Contrasted results are obtained for the s-wave N(1535) and N(1650) resonances which are affected by a nuclear environment very little. The properties of slowly moving isobar's in nuclear matter are found to depend very sensitively on a soft form factor in the π N N vertex, which is not controlled by the πN scattering data.

Original languageEnglish
Pages (from-to)305-321
Number of pages17
JournalNuclear Physics A
Volume742
Issue number3-4
DOIs
Publication statusPublished - Oct 4 2004

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isobars
pions
propagation
scattering
softening
form factors
apexes
phase shift
formulations
predictions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Self consistent and covariant propagation of pions, nucleon and isobar resonances in cold nuclear matter. / Korpa, C.; Lutz, M. F M.

In: Nuclear Physics A, Vol. 742, No. 3-4, 04.10.2004, p. 305-321.

Research output: Contribution to journalArticle

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