Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 54: Structure of Baryons, Mesons VII, Theory

HK 54.6: Talk

Wednesday, March 18, 1998, 16:15–16:30, H

Nuclear kaon dynamics — •Matthias Lutz — GSI, Planckstr.1 , D-64291 Darmstadt

An effective low energy Lagrangian density is applied to nuclear K⁻ dynamics. The free parameters, local s-wave couplings and SU(3)-symmetry constrained range terms are adjusted to describe elastic and inelastic K⁻ -nucleon scattering data. The propagation and decay of the Λ (1405) resonance and the Λ (1405) nucleon hole state is studied self consistently with respect to the K⁻ propagation in isospin symmetric nuclear matter. The Λ (1405) mass shift results from the repulsive Pauli blocking effect and the attractive feedback effect of a decreased K⁻ mass. Alltogether the resonance mass is left basically at its free space value, however, with an increased decay width. For the K⁻ spectral density we predict a strong dependence on the K⁻ three momentum. Finally the K⁻ nuclear optical potential is derived and confronted with kaonic atom data.