  We present a computation of Cu K-edge resonant inelastic x-ray scattering
(RIXS) spectra for electron-doped cuprates which includes coupling to bosonic
fluctuations. Comparison with experiment over a wide range of energy and
momentum transfers allows us to identify the signatures of three key
normal-state energy scales: the pseudogap, charge transfer gap, and Mott gap.
The calculations involve a three band Hubbard Hamiltonian based on Cu
$d_{x^2-y^2}$ and O $p_x$, $p_y$ orbitals, with a self-energy correction which
arises due to spin and charge fluctuations. Our theory reproduces
characteristic features e.g., gap collapse, large spectral weight broadening,
and spectral weight transfer as a function of doping, as seen in experiments.
