Polarization of the nuclear medium and RPA-type calculations in $K^{+}$ scattering from nuclei

Abstract

In the calculation of the $K^{+}$-nucleus cross sections, the coupling of the mesons exchanged between the $K^{+}$ and the target nucleons to the polarization of the Fermi sea has been taken into account. This polarization has been calculated in the one-loop approximation but summed up to all orders (RPA-type calculation). This effect is found to be rather important but does not improve the agreement with experiment.

Comments: 11 pages, LaTeX, 3 figures available upon request, LPTB-93-9