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Title of article :
Self consistent and covariant propagation of pions, nucleon and isobar resonances in cold nuclear matter Original Research Article
Author/Authors :
C.L Korpa، نويسنده , , M.F.M. Lutz، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2004
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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 isobarʹs in nuclear matter are found to depend very sensitively on a soft form factor in the πNN vertex, which is not controlled by the πN scattering data.
Journal title :
Nuclear physics A
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