A new signal for scalar top bound state production

We study the production and decay of a scalar \stst\ bound state \sigst\ at hadron supercolliders, 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 $h$. Nevertheless the branching ratio into two photons is often large enough to yield a detectable signal.