SUSY induced top quark FCNC decay $t \to c h$ after Run I of LHC

Understand

In light of the Higgs discovery and the nonobservation of sparticles at the LHC, we revisit the SUSY induced top quark flavor changing decay into the Higgs boson.

• We perform a scan over the relevant SUSY parameter space by considering the constraints from the Higgs mass measurement, the LHC search for SUSY, the vacuum stability, the precision electro-weak observables as well as $B \to X_s \gamma$.
• We have the following observations: (1) In the MSSM, the branching ratio of $ t \to c h$ can only reach $3.0\times10^{-6}$, which is about one order smaller than previous results obtained before the advent of the LHC.
• Among the considered constraints, the Higgs mass and the LHC search for sparticles are found to play an important role in limiting the prediction.