  We investigate ways of identifying two kinds of dark matter (DM) component
particles at high-energy colliders. The strategy is to notice and distinguish
double-peaks(humps) in the missing energy/transverse energy distribution. The
relative advantage of looking for {\em missing energy} is pointed out, in view
of the fact that the longitudinal component of the momentum imbalance becomes
an added input. It thus turns out that an electron-positron collider is better
suited for discovering a two-component DM scenario. Furthermore, using Gaussian
fits of the distribution histograms, we develop a set of criteria to evaluate
the distinguishability of the two-peaks quantitatively.

High Energy Physics - Phenomenology