Mesonic exchange current contribution to K+ nucleus scattering.

A microscopical many-body calculation of the self-energy of a positive kaon interacting with a nucleus is carried out of kinetic energies Tk up to 500MeV. On top of the well know contribution of the impulse approximation, we have considered the kaon coupling to the pions in the nucleus. Previous approximations for the pionic cloud contribution, specially on the imaginary part from the pionic cloud wich were not previously considered. The results for the total and differential cross sections are satisfactory after these new contributions are included, but uncertainties remain in the real part. Nieves Pamplona, Juan Miguel, Juan.M.Nieves@ific.uv.es ; Oset Baguena, Eulogio, Eulogio.Oset@ific.u…