  We calculate the renormalized parameters for the quasiparticles and their
interactions for the Hubbard model in the paramagnetic phase as deduced from
the low energy Fermi liquid fixed point using the results of a numerical
renormalization group calculation (NRG) and dynamical mean-field theory (DMFT).
Even in the low density limit there is significant renormalization of the local
quasiparticle interaction $\tilde U$, in agreement with estimates based on the
two-particle scattering theory of Kanamori (1963). On the approach to the Mott
transition we find a finite ratio for $\tilde U/\tilde D$, where $2\tilde D$ is
the renormalized bandwidth, which is independent of whether the transition is
approached by increasing the on-site interaction $U$ or on increasing the
density to half-filling.The leading $\omega^2$ term in the self-energy and the
local dynamical spin and charge susceptibilities are calculated within the
renormalized perturbation theory (RPT) and compared with the results calculated
directly from the NRG-DMFT. The dynamic ${\bf q},\omega$ spin susceptibility
$\chi({\bf q},\omega)$ is also estimated from repeated quasiparticle scattering
with a local renormalized scattering vertex.
