  We compute the ghost spectral function in Yang-Mills theory by solving the
corresponding Dyson-Schwinger equation for a given input gluon spectral
function. The results encompass both scaling and decoupling solutions for the
gluon propagator input. The resulting ghost spectral function displays a
particle peak at vanishing momentum and a negative scattering spectrum, whose
infrared and ultraviolet tails are obtained analytically. The ghost dressing
function is computed in the entire complex plane, and its salient features are
identified and discussed.
