  We consider the discovery potential of light stops in the MSSM at the LHC.
Here, we assume that the lightest neutralino is the LSP and that the lighter
stop is the NLSP. Direct stop pair production is difficult to probe in
scenarios with a small mass splitting between the stop and a neutralino. We
discuss two different search channels: the monojet and the two $b$--flavoured
jets and large missing transverse energy signature. We present the discovery
reach in the stop--neutralino mass plane for both channels. The latter process
is sensitive to the stop--higgsino--$b$ quark coupling. This allows us to test
a supersymmetry relation involving superpotential couplings. We briefly comment
on the possible precision with which the coupling can be measured.
