We examine experimental constraints on scharm-stop flavor mixing in the minimal supersymmetric standard model, which arise from the experimental bounds on squark and Higgs boson masses, the precision measurements of $W$-boson mass and the effective weak mixing angle, as well as the experimental data on $B_s-{\overline{B}}_s$ mixing and $b\to s\gamma$. We find that the combined analysis can put rather stringent constraints on ${\tilde{c}}_L-{\tilde{t}}_L$ and ${\tilde{c}}_L-{\tilde{t}}_R$ mixings. As an illustration for the effects of such constraints, we examine various top-quark flavor-changing neutral-current processes induced by scharm-stop mixings at the LHC and find that their maximal rates are significantly lowered.

• Received 24 April 2006

DOI:https://doi.org/10.1103/PhysRevD.74.031701