  The quasiparticle band structures of 3d transition metals, ferromagnetic Fe,
Ni and paramagnetic Cu, are calculated by the GW approximation. The width of
occupied 3d valence band, which is overestimated in the LSDA, is in good
agreement with experimental observation. However the exchange splitting and
satellite in spectra are not reproduced and it is required to go beyond the GW
approximation. The effects of static screening and dynamical correlation are
discussed in detail in comparison with the results of the static COHSEX
approximation. The dynamical screening effects are important for band width
narrowing.
