In the Minimal Supersymmetric Standard Model, one of the scalar top quarks can be relatively light and its couplings to Higgs bosons strongly enhanced. I will discuss two consequences of this feature: 1) the effects of scalar top loops on the main production mechanism of the lightest Higgs boson at the LHC, the gluon-fusion mechanism $gg \to h$, and on the important decay channel into two photons $h \to \gamma \gamma$; and 2) the production of the light Higgs particle in association with top-squark pairs at proton colliders, $pp \to \tilde{ t}_1 \tilde{ t}_1 h$.
Categories: hep-ph