  The origin and main properties of new heavy hadrons as dark matter
candidates, are represented. Low-energy interactions of new hadrons with
leptons and nucleons are described in the terms of effective vertexes. We
consider the lowest excited levels of new mesons in the frame-work of the Heavy
Quark Effective Theory. The effect of fine and hyper-fine splitting of excited
states follows directly from this theory. We analyze phenomenological
consequences of this effect as manifestation of dark matter particles.
