  Recent angle-resolved photoemission experiments in hole doped cuprates
reported new and interesting high energy features which may be useful for
understanding the electronic properties of these materials. Using a
perturbative approach, which allows the calculation of dynamical properties in
the $t-J$ model, one-electron spectral properties were calculated. A strongly
renormalized quasiparticle band near the Fermi surface and incoherent spectra
at high energy were obtained. Among different current experimental
interpretations, the obtained results are closer to the interpretation given by
Pan {\it et al.}\cite{pan}. The self-energy shows large high energy
contributions which are responsible for the incoherent structures showed by the
spectral functions and the reduction of the quasiparticle weight and bandwidth.
According to the calculation, collective charge fluctuations are the main
source for the self-energy renormalizations. For testing if the obtained
self-energy is compatible with transport measurement the resistivity versus
temperature was estimated.

Strongly Correlated Electrons