Top-quark rare decay $t\to ch$ in R-parity-violating SUSY

Abstract

The flavor-changing top-quark decay $t\to ch$, where $h$ is the lightest CP-even Higgs boson in the minimal supersymmetric standard model, is examined in the R-parity-violating supersymmetric model. Within the existing bounds on the relevant R-parity-violating couplings, the branching fraction for $t\to ch$ can be as large as about $10^{-5}$ in some part of the parameter space.

Comments: version to appear in Phys. Lett. B