  In this work, we assess the accuracy of dielectric-dependent hybrid density
functionals and many-body perturbation theory methods for the calculation of
electron affinities of small water clusters, including hydrogen-bonded water
dimer and water hexamer isomers. We show that many-body perturbation theory in
the G$_0$W$_0$ approximation starting with the dielectric-dependent hybrid
functionals predicts electron affinities of clusters within 0.1 eV of the
coupled-cluster results with single, double, and perturbative triple
excitations.
