Scalar Stoponium

We study the decays of a scalar \stst\ bound state \sigst, where \st\ is the lighter stop eigenstate. If \st\ has no tree–level 2–body decays, the dominant decay modes of \sigst\ are $gg$ or, if $m_h<\text{mst}\ll \text{mstt}$, a pair of light scalar Higgs bosons $h$. The best signal for \sigst\ production at hadron colliders is probably its decay into two photons.