  It has been suggested recently that an arbitrary induced theta-vacuum state
could be created in heavy ion collisions. If such a state can be created, it
would decay by various mechanisms to the fundamental theta=0 state which is the
true ground state of our world. In the following we will discuss the
possibility of studying this unusual state through the emission of pions,
eta-mesons, and eta'-mesons. We will also present the spectrum of the produced
particles in this non-zero theta background. We use the instantaneous
perturbation theory for our estimates.
