Big-bang nucleosynthesis with long-lived charged slepton

We consider constraints on long-lived charged scalar leptons l˜± in supersymmetric models, where gravitino is the lightest superparticle. We study the decay and hadronization processes of l˜±. We also take into account the significant enhancement of 6L production due to the formation of the bound-state (He4l˜−); for this purpose, we use the reaction rate given by the most recent calculation based on coupled-channel method.