### 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 language | English |
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Pages (from-to) | 305-321 |

Number of pages | 17 |

Journal | Nuclear Physics A |

Volume | 742 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - Oct 4 2004 |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Nuclear Physics A*,

*742*(3-4), 305-321. https://doi.org/10.1016/j.nuclphysa.2004.06.031

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

Research output: Contribution to journal › Article

*Nuclear Physics A*, vol. 742, no. 3-4, pp. 305-321. https://doi.org/10.1016/j.nuclphysa.2004.06.031

}

TY - JOUR

T1 - Self consistent and covariant propagation of pions, nucleon and isobar resonances in cold nuclear matter

AU - Korpa, C.

AU - Lutz, M. F M

PY - 2004/10/4

Y1 - 2004/10/4

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=4444236881&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4444236881&partnerID=8YFLogxK

U2 - 10.1016/j.nuclphysa.2004.06.031

DO - 10.1016/j.nuclphysa.2004.06.031

M3 - Article

AN - SCOPUS:4444236881

VL - 742

SP - 305

EP - 321

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

IS - 3-4

ER -